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1
Sivathanu Pillai, C., A. R. Santhakumar e R. Murugan. "Innovative Method of Shielding the SS Pipe Carrying Industrial Wastes by Using Self-Compacting Concrete for Sustainable Construction". Key Engineering Materials 692 (maggio 2016): 110–18. http://dx.doi.org/10.4028/www.scientific.net/kem.692.110.
Testo completoAbstract (sommario):
In an underground R.C. Tunnel constructed as conduit for SS Pipes carrying industrial waste liquid, heavy ingress of ground water was witnessed and had to be overcome. Industrial wastes are to be carried through pipes in pipe system with an outer casing of a 200 mm dia SS pipe. Continuous contact of ground water with the casing SS pipe will deteriorate the pipe with the consequence of mixing of waste with the ground water. To avoid this, tunnel was sealed by enclosing the casing pipe with self-compacting concrete (SCC) for preventing ingress of ground water into the tunnel. As sustainability comprise Economy, Environment and social impact, the use of SCC take care the above factors by utilizing fly ash which replaces cement ,thereby, protecting the environment from industrial waste to produce socially accepted concrete and ensuring sustainable construction.
2
Zhou, Mi, Hanlong Liu, Muhammad Shazzad Hossain, Yuxia Hu e Ting Zhang. "Numerical simulation of plug formation during casing installation of cast-in-place concrete pipe (PCC) piles". Canadian Geotechnical Journal 53, n. 7 (luglio 2016): 1093–109. http://dx.doi.org/10.1139/cgj-2015-0162.
Testo completoAbstract (sommario):
There is a historic lack of research examining inner soil plugging and outer lateral soil deformation during installation of pipe piles in clay. Furthermore, the influence of the pile tip geometry on soil deformation has not been investigated. Cast-in-place concrete pipe (PCC) piles are a recent generation of pipe piles for soft ground improvement applications, and are cast in place using an innovative double-walled steel casing with a tapered tip. This paper investigates the effect of tip geometry on soil flow mechanisms inside and outside the PCC pile casing during installation in clay. Large-deformation finite element (LDFE) analysis was conducted simulating the continuous penetration process of the casing installation. The LDFE results were validated against (i) field monitoring data in terms of soil lateral displacement and heave outside the casing and (ii) centrifuge test data in terms of penetration resistance, with excellent agreement obtained. An extensive parametric study was then performed encompassing a practical range of parameters. The geometry of the casing tip was shown to have significant influence on the soil movements inside and outside the casing, but minimal effect on the casing penetration resistance. The optimal tapered tip with a tip angle of 45° and minimal extended tip length beneath the tip angle allowed more soil to be pushed inside the casing and less lateral displacement outside the casing, which dictates the amount of concrete required to fill the cavity inside the pile and the pile construction sequence, respectively. Design expressions are proposed for estimating soil movements inside and outside the casing with optimal tip geometry being installed.
3
Haldorsen, Jakob B. U., Espen Stensrud, Ioan-Alexandru Merciu e Douglas E. Miller. "Characterizing borehole plumbing using full-waveform ultrasonic data: Application to data from a North Sea well". GEOPHYSICS 81, n. 6 (novembre 2016): B189—B199. http://dx.doi.org/10.1190/geo2015-0546.1.
Testo completoAbstract (sommario):
We have analyzed ultrasonic flexural data acquired in a North Sea well using a commercial tool optimized for generating such data, and found how one might separate refractions along successive layers of casings, and from these separated refractions, characterize successive pipes and annuli. From the timing of refracted events, we determined the shape of a pipe, and by examining the amplitudes of these refracted events — a measure of the conductance of a pipe wall to transverse movement — we characterized the material in the annuli around a pipe. Data from two separate depth intervals were analyzed, demonstrating that a well plan might not give a sufficiently accurate description of the well. In the deeper interval in which the inner pipe was supposed to be free, we found that the annulus was most likely filled with sedimentation and debris. We could also see that the inner 7 in tubing was touching, or nearly touching, the outer 9⅝ in casing over the entire interval. For the shallower interval, below a certain depth, we saw that the 7 in tubing appeared to be touching the 9⅝ in casing approximately every 7–8 m. From measurements inside the 7 in tubing, we estimated the deformation of the outer 9⅝ in casing to be up to a maximum of nearly 5 cm, meaning that the minimum inner diameter of the outer pipe was close to the outer diameter of the inner pipe. Whereas some features revealed by the analyses were “good-to-know” — such as minor pipe deficiencies and deformations — other features might be critical for planned overhaul, or for operations related to abandonment, e.g., touching points were potential sticking points. Knowing where they were may be critical in determining the best depth to cut a pipe before pulling.
4
Kovalev, Vladimir A. "Process diagrams of the driving pile construction in the perforated pipe casing". Stroitel stvo nauka i obrazovanie [Construction Science and Education], n. 4 (31 dicembre 2019): 2. http://dx.doi.org/10.22227/2305-5502.2019.4.2.
Testo completoAbstract (sommario):
Introduction. Driving piles in drilled wells are a new trend in pile foundation engineering. Further research and development are devoted to the improvement of structural and process diagrams of these piles in order to increase the bearing capacity mainly on their side surface, mainly in weak clay soils. Materials and Methods. The options of flow and process diagrams of driving piles in perforated (penetrated) wells in various soil conditions are studied taking into account the existing regulatory documents and earlier developments on increasing the bearing capacity of driving piles in perforated (penetrated) wells. Results. The main process operations of the driving piles installation in the soil conditions under consideration include perforation (penetration) of the well with a casing with a loose puncher shoe to the base layer of the soil; formation of a well (cavity) in the base layer of the well by means of immersion of the puncher shoe; installation of a shoe reamer in the puncher shoe and formation of a spread foundation made of hard soil material above; immersion of a casing pipe with holes outside the pipe casing; filling of the casing with hard and bulk soil material; removal of the casing and driving (immersion) into the pipe casing of the precast concrete pile filled with bulk soil material with simultaneous formation of additional local broadening and possible compacted soil zones on the sections of holes along the outer contour of the pipe casing. Conclusions. The proposed structural and process diagrams of driving piles in perforated (penetrated) wells allow to significantly expand the scope of their application in terms of soil conditions, increase the side surface bearing capacity of piles and reliability of the construction of the types of foundations under consideration.
5
Qin, Yan Bin, Yi Hua Dou, Xiao Zeng Wang e Jing Wen Yang. "Development of the Ring Block Drill Pipe Casing Wear Tester and Experimental Research". Advanced Materials Research 634-638 (gennaio 2013): 3582–85. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3582.
Testo completoAbstract (sommario):
In deep wells and ultra-deep wells the complex geological conditions often result in serious casing wear. In order to be able to accurately measure the wear efficiency and friction coefficient required in the process of the prediction of casing wear, a ring-block drill pipe and casing wear tester is specifically designed and produced, the scheme of tester is proposed, and the design of structure, driving device, and the detecting system of the friction and contact forces of tester is completed. Adopting the ring block drill pipe casing wear tester and simulating down hole conditions P110 casing wear experiments are finished. The results show that the ring block drill pipe casing wear tester meets the requirement of down hole casing wear experiment. P110 casing wear efficiency decreased with the increasing of wear time. The friction coefficient between the P110 casing and the drill pipe sample is about 0.25.
6
Yang, Ce, Hanzhi Zhang, Dengfeng Yang, Dazhong Lao e Changmao Yang. "Casing wall static pressure distribution behavior in a centrifugal compressor with asymmetric inlet/outlet structures". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, n. 1 (15 maggio 2018): 37–51. http://dx.doi.org/10.1177/0957650918774934.
Testo completoAbstract (sommario):
Asymmetric structures of the bent inlet pipes and outlet volute are typically adopted in centrifugal compressors. By using asymmetric inlet/outlet structures, the uniformity of the compressor’s internal flow field in the circumferential direction will be changed. The static pressure distribution behavior around the casing wall is significantly influenced by the coupling effect of the bent inlet pipe and outlet volute. In the present work, three compressors were numerically and experimentally investigated. One compressor had a straight inlet pipe, and the other two had bent inlet pipes. Seventy-two static pressure sensors were mounted around the casing wall to obtain the static pressure distribution at different flow rates for three rotational speeds. The results show that at high rotational speeds with large flow rate conditions, when the static pressure waves induced by the bent pipe and volute act on the same circumferential position, the casing wall static pressure will be increased at the corresponding position. Furthermore, this high static pressure will further influence the static pressure values at other circumferential positions and leads to a more nonuniform circumferential static pressure distribution. Near the design flow rate, when the high static pressure strips, which are induced by both the bent pipe and volute impact different circumferential positions, the high static pressure strip induced by the volute will be weakened. As a result, the high static pressure strip induced by the volute cannot propagate upstream into the impeller. At small flow rate under designed rotational speed, the influence of the volute tongue on the casing pressure distribution will be enhanced. At small flow rate under low rotational speed, the casing pressure distributions of the three models were almost the same because the secondary flow effect of the bent pipe diminishes as the flow rate reduces.
7
Li, Jie, Jun Du, Xian Chen e Yanli Wang. "Effects of pipe casing structure on acoustic emission characteristics of underwater pyrotechnic combustion". Journal of Low Frequency Noise, Vibration and Active Control 39, n. 1 (13 aprile 2019): 149–57. http://dx.doi.org/10.1177/1461348419842686.
Testo completoAbstract (sommario):
In order to investigate the acoustic radiation characteristics of underwater, a pipe casing was introduced and the effects of its main structural characteristics on underwater combustion acoustic radiation were studied by acoustic testing. The results show that the addition of the pipe casing significantly increased the sound pressure level of underwater pyrotechnic combustion, especially the peak of sound pressure level that was increased by 15.9 dB from 155.5 to 171.4 dB at the frequency of 125 and 100 Hz. But the addition of the pipe casing had little effect on the frequency. These results indicated that adding a pipe casing is effective for improving sound pressure level in underwater pyrotechnic combustion. An increase in nozzle diameter from 10 to 12.5 mm resulted in an increase of gas volume, so the peak of sound pressure level and broadband sound pressure level is higher. Changing the pipe casing direction to vertical downward will make the bubble formation period shorter, which will generate more bubbles and strong wake; the interaction between bubbles and wake results in a higher intensity of turbulence, which accounts for the coalescence and breakup of bubbles in the fluid. Besides, changing the diameter of pipe casing can be used to lower the frequency of underwater noise.
8
Zhou, Zhi, Jianping He, Minghua Huang, Jun He e Genda Chen. "Casing Pipe Damage Detection with Optical Fiber Sensors: A Case Study in Oil Well Constructions". Advances in Civil Engineering 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/638967.
Testo completoAbstract (sommario):
Casing pipes in oil well constructions may suddenly buckle inward as their inside and outside hydrostatic pressure difference increases. For the safety of construction workers and the steady development of oil industries, it is critically important to measure the stress state of a casing pipe. This study develops a rugged, real-time monitoring, and warning system that combines the distributed Brillouin Scattering Time Domain Reflectometry (BOTDR) and the discrete fiber Bragg grating (FBG) measurement. The BOTDR optical fiber sensors were embedded with no optical fiber splice joints in a fiber-reinforced polymer (FRP) rebar and the FBG sensors were wrapped in epoxy resins and glass clothes, both installed during the segmental construction of casing pipes. In situ tests indicate that the proposed sensing system and installation technique can survive the downhole driving process of casing pipes, withstand a harsh service environment, and remain intact with the casing pipes for compatible strain measurements. The relative error of the measured strains between the distributed and discrete sensors is less than 12%. The FBG sensors successfully measured the maximum horizontal principal stress with a relative error of 6.7% in comparison with a cross multipole array acoustic instrument.
9
Witek, Wiesław, e Marcin Rzepka. "Zjawiska chemiczno-technologiczne podczas zabiegu cementowania otworu w aspekcie projektowania rur okładzinowych ze szczególnym uwzględnieniem ich wytrzymałości na zgniatanie i rozrywanie". Nafta-Gaz 77, n. 3 (marzo 2021): 187–99. http://dx.doi.org/10.18668/ng.2021.03.05.
Testo completoAbstract (sommario):
One of the most important issues that needs to be addressed in the borehole design process is the optimal design of the borehole structure, including the appropriate selection of individual casing columns and their setting given the assumed geological and cementing-technical conditions. Specific geological and technical conditions imply a number of both conditions and constraints. A kind of dimensional unification of pipes adopted by API many decades ago, i.e. a series according to the outer diameter of the pipes, constitutes the main natural constraint. Other elements of this unification, such as a series of steel grades or of classic and PREMIUM thread connections were implemented gradually as drilling technology developed. Regardless of these conditions, one thing always remains the same when designing casing and selecting production tubing, i.e. maintaining the balance between the existing loads acting on the pipes during the drilling process and operation of the borehole and the minimum mechanical strength of the pipes. This article reviews the methods and guidelines for casing pipe designing published by API and of computer programs, including StressCheck, which is currently one of the commonly used pipe design tools. The strength issues discussed in the article refer mainly to the pipe body, ignoring the complex issue of the strength of the thread connections, especially those of PREMIUM type, whose qualification is not subject to API standards, but to the guidelines contained in ISO 13679.
10
Li, Zheng, Hong Wu Zhu, Xiao Li Fan, Jian Sheng Hao e Xiang Ling Kong. "Numerical Analysis of Pressure Gradient along Casing in Helical Turbulent Flow of Power Law Fluid in Eccentric Annulus". Advanced Materials Research 616-618 (dicembre 2012): 685–89. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.685.
Testo completoAbstract (sommario):
With the use of casing running tool (CRT), casing can be rotated and reciprocated at the same time with circulation of drilling fluid. Thus the flow in well bore was eccentric annular helical. Pressure exerted on casing was important for casing buckling analysis. A numerical model of eccentric annular helical flow of power law fluid was built in this paper. The relationship between average pressure gradient on pipe and some influence factors (pipe axial velocity, rotating angular velocity, drilling fluid circulation velocity, and axial coordination) was analyzed. Results showed that average pressure gradient caused by shear stress was only affected by average annular flow velocity, and it didn’t change along pipe length. Effect of rotating angular velocity on average pressure gradient on pipe was very small and could be negligible. A fitting function between average pressure gradient and average annular flow velocity was obtained in this end.
11
Zhang, Chao Ge. "Improvement of Stamping Forming Process and Design of Fully Automatic Die for Lipstick Casing Pipe". Advanced Materials Research 230-232 (maggio 2011): 448–52. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.448.
Testo completoAbstract (sommario):
According to its structure and dimension, the original stamping forming process of the lipstick casing pipe was analyzed. In view of such drawbacks as dispersed working procedures, lower efficiency and unstable product quality in the original manufacturing process, wall thickness of the lipstick casing pipe was modified and became thinner than its original size with the premise of ensuring utility performance. A new manufacturing process for the modified lipstick casing pipe was provided and a fully automatic stamping die, which is more secure in operation, lowers raw material expense and has higher production efficiency, was designed.
12
An, Ying, Wei Min Yang, Yang Zhang e Hui Qing Zhao. "Application of Rubber Non-Rotating Drill Pipe Protectors in Drilling". Advanced Materials Research 11-12 (febbraio 2006): 765–0. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.765.
Testo completoAbstract (sommario):
Using of rubber non-rotating drill pipe protectors is one of the most important technology measures to reduce the casing wear and rotary torque of drill pipe in case of drilling deep well, ultradeep well, extended reach well and horizontal well. This paper presents the operating principle of protectors, and investigates the effect on contact pressure with the using of protectors by finite element analysis (FEA). The results give out the theoretical foundation of reducing the casing wear and rotary torque of drill pipe by using rubber non-rotating drill pipe protectors.
13
Liu, Jian, Gang Li e Yu Kun Song. "Study on Threading-up Characteristics of Buttress Thread of Petroleum Coupling". Advanced Materials Research 335-336 (settembre 2011): 308–11. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.308.
Testo completoAbstract (sommario):
This article is taking 5.5"special thread petroleum casing-pipe as example, using nonlinear technology of Ansys FEA software to analyze characteristics of threading up and unload of the petroleum casing-pipe. The result of FEA is conformed to the experiment. It provides strong help for the enterprises using research data to instruct practice further.
14
Dong, Jun, Hong Ping Gao, Xin Chao Qiao e Jian Guang Dong. "Optimization Design of Precast Casing Pipe Unit". Advanced Materials Research 706-708 (giugno 2013): 1468–74. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1468.
Testo completoAbstract (sommario):
The level of the mould design directly influence the quality of track slab , influence the smoothness and stability of the a high-speed railway further .Precast casing pipe unit is one of the key parts in the mould, which definitely influence the quality of track slab. Combined with the track slab manufacturing in Nanjing-Anqing special line, we have discussed five schemes on precast casing pipe unit of the mould, and the best scheme been formed after comparison and optimization. It is proved by the process of the track slab production that the best scheme can ensure precision of track slab, be operationally convenient, bring obvious benefit and is worth spreading.
15
Wiesłw, Wiesław, e Marcin Rzepka. "Zjawiska chemiczno-technologiczne podczas zabiegu cementowania otworu w aspekcie projektowania rur okładzinowych". Nafta-Gaz 77, n. 2 (febbraio 2021): 92–105. http://dx.doi.org/10.18668/ng.2021.02.04.
Testo completoAbstract (sommario):
Borehole design is a complex and multidimensional question in terms of the number of issues to be resolved in terms of mechanical, environmental and public safety engineering requirements. In this article contains a review and evaluation of chemical phenomena and processes (not always correctly evaluated) that occur during the preparation of cement slurry and after its displacement during the formation of the gel structure of cement and cement sheath. As a result of the chemically complicated process of slurry gelation, a new structure is formed, i.e. steel pipe – sheath (cement stone) – a rock which in a specific way produces a specific type of load and stress in the annular space, and thus influences changes in hydrostatic pressure distribution. Such phenomena described in this article allow to understand the methodical approach to the process of designing pipes, especially in the aspect of collapse and burst of pipes with big diameter >13⅜″ and thin wall (in the 4th load regime). This does not mean that the tensile strength of pipes is not an important issue in pipe design, but it mainly concerns very deep boreholes, while collapse and burst of pipes occurs in special (often unforeseen) cases of full or partial evacuation for shallow pipe foundation in the hole. The article is based on extensive professional literature, as well as on numerous tests carried out at Oil and Gas Institute – National Research Institute on different types of cement slurries and drilling muds, and, moreover, on the relevant experience of the authors of the article, both in the field of slurry design and supervision of cement operations, as well as in the design and supervision of works related to drilling of various types of boreholes, including cement job and running casing.
16
Haldorsen, Jakob B. U., Espen Stensrud, Ioan-Alexandru Merciu e Douglas E. Miller. "Decomposing full-waveform borehole acoustic data with application to data from a North Sea well". GEOPHYSICS 81, n. 4 (luglio 2016): IM71—IM95. http://dx.doi.org/10.1190/geo2015-0428.1.
Testo completoAbstract (sommario):
The objective of this study is to establish whether sonic data acquired in a cased hole can be used to estimate the material behind a second casing when the annulus between the two sets of casings is fluid filled. We have analyzed full-waveform data acquired using the Schlumberger tool Sonic Scanner for a double casing with a fluid between them, and where the outer annulus, outside the outer casing, might be cement filled or fluid filled. The sonic tool uses a cylindrical array of 104 omnidirectional receivers. The cylindrical array — approximately 4 in. in diameter and 1.8 m (6 ft) long — allows a formal decomposition of the acquired data into quasi-plane waves. Analyzing these plane waves, we have identified subtle but distinct changes in the waveforms. These changes appear to be dependent on the material filling the outer annulus, allowing for the determination of the fill material. The most significant changes relate to the propagating Stoneley waves. The identifications made are confirmed by cement bond log (CBL) analysis done on the exposed outer pipe after pulling the inner pipe. In one instance, for single-casing logging and a clean top-of-cement, like with conventional CBL analysis, we were able to confidently and accurately identify the cement/fluid boundary. In another instance, we were able to identify it as a nondistinct/smooth transition zone. For double-casing logging, we could confidently and accurately identify the cement/fluid boundary behind the second casing. For one case, we have substantiated that this zone has a longer interval of smooth transition from cement to consolidated/unconsolidated barite to a fluid-filled annulus.
17
Farzam, M., P. Baghery e H. R. Mardan Dezfully. "Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields". ISRN Materials Science 2011 (22 agosto 2011): 1–8. http://dx.doi.org/10.5402/2011/681535.
Testo completoAbstract (sommario):
API 5A and 5L (grades J55, H40, N80, and K55) are used in making drill pipe and well casing. In this paper after studying the rheological and chemical properties of the mud, the effective corrosion parameters were reviewed and studied. The drill pipe corrosion management, with reference to NACE PRO 502-2002 was made and showed that for 50 drilling rigs 120 million dollars is to be spent in 21 years for corrosion damage. Potentiodynamic polarization tests were made to study the drill-pipe (API 5A), well casing (API 5L), a connecting tube (AISI 1020), and drill cable (AISI 1080) corrosion behavior in different pH and mud chemistry; following these tests, the pitting potential at which wash-out of drill pipe occurs was determined.
18
Komarudin, Udin, Iftika Philo, Nia Nuraeni e Nissa Syifa Puspani. "Pipe Stress and Turbine Nozzle Load Analysis for HP Steam Inlet and MP Steam Extraction on Turbine Generator 51G201T Capacity 10MW". International Journal of Engineering & Technology 7, n. 4.33 (9 dicembre 2018): 214. http://dx.doi.org/10.14419/ijet.v7i4.33.23562.
Testo completoAbstract (sommario):
Thermal pipe expansion on the turbine greatly affects the performance of the turbine, mainly produces misalignment in turbines. The stress analysis on the pipe and the load on the nozzle is very important to ensure that the stress that occurs is still safe and the load that occurs on the nozzle is still below the allowable load. Field information is known, Steam type of 51-G-201-T, capacity 10 MW, total weighs 58 tons, weight casing 37 tons, which has been operating since July 1989, has been occur misalignment on turbines. Stress pipe and load analysis of turbine nozzles on the turbine using software (Autopipe V8i Select Series 3 Edition by Bentley). In this perspective, calculation methodologies were developed in order to do quick analysis of the most common configurations, according to the codes ASME B31.1 (Piping Power). The results of the pipe stress analysis showed that the maximum sustained stress ratio occurred at point A39 (0.32), maximum displacement stress ratio at point A39 (0.97) and maximum hoop stress ratio at point A09 (0.44), all values below 1. This shows that the stress is still safe. The result of load analysis on the turbine casing is the direction x = -880 kg, y = 6246.4kg, z = -3697.7kg, smaller than the weight of the 37 tones turbine casing, so misalignment is not caused by shifting the turbine casing.
19
Rakin, Marko, B. Medjo, Miodrag Arsić, Ž. Šarkoćević, I. Ivanović e Aleksandar Sedmak. "API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters". Key Engineering Materials 488-489 (settembre 2011): 577–80. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.577.
Testo completoAbstract (sommario):
Seam casing pipe used in an oil drilling rig, manufactured by high frequency (HF) contact welding of API J55 steel, is tested. The influence of an initial defect (machined surface crack) is analysed, by performing pressure test of a pipe segment closed at both ends. Besides the damages at the internal surface, casing pipes are exposed to damage at the external surface, which is why such configuration is analysed here. Measurement of strains and crack mouth opening displacement (CMOD) enabled the application of direct method for J integral evaluation. This procedure is based on the path independence of the J integral and can be applied both in laboratory conditions (on specimens) and on structures. However, it requires a demanding experimental - computational procedure, which is accomplished here using the developed routine. Additionally, the behaviour of the pipe under internal pressure, including fracture mechanics parameters determination, is modelled numerically (by finite element method) in software package Abaqus. The pressure is applied as distributed load acting on the inner surface of the three-dimensional model, and axial tension is applied at the end of the pipe to simulate the closed end. J integral values determined numerically and using direct method are used for estimation of the critical pressure corresponding to the crack growth initiation. Additionally, plastic limit load, i.e. pressure which causes yielding of the ligament, is determined. Based on the results, criteria for pipe integrity assessment are discussed
20
Huang, Zhiqiang, Zhongquan Yin e Wei Wu. "Experimental research on improving the wear resistance and anti-friction properties of drill pipe joints". Industrial Lubrication and Tribology 73, n. 9 (3 ottobre 2021): 1198–208. http://dx.doi.org/10.1108/ilt-06-2021-0232.
Testo completoAbstract (sommario):
Purpose The purpose of this study is to solve the oil drill pipe joints and casing excessive wear problems and to improve the drill pipe joint-casing wear resistance and anti-friction properties. Design/methodology/approach On the surface of the drill pipe joints using oxyacetylene flame bead weld (BW) wear-resistant welding wire ARNCO-100XTTM prepares welding layer, high-velocity oxygen fuel (HVOF) Cr3C275-NiCr25 prepares coating and subsonic flame spray and remelt (SFSR) Ni60 prepares coating, then comparing and analyzing the friction and wear of the three types of wear-resistant layers and the casing under the condition of 1.8 g/cm3 mud drilling fluid lubrication. The wear resistance and anti-friction performance of the drill pipe joints were evaluated based on the wear situation, finally revealing its friction and wear mechanisms. Findings Three types of wear-resistant layers can improve the surface wear resistance of drill pipe joints, the wear-resistant layer and the substrate are well combined and the welding layers and coating are both dense and uniform. The wear resistance of the HVOF-Cr3C275-NiCr25 coating is 10.9 times that of the BW-ARNCO-100XTTM weld layer, and the wear resistance of the SFSR-Ni60 weld layer is 2.45 times that of the BW-ARNCO-100XTTM weld layer. The anti-friction properties of SFSR-Ni60 welding layer is the best, followed by HVOF-Cr3C275-NiCr25 coating, and the anti-friction properties of BW-ARNCO-100XTTM welding layer is the worst among the three. Originality/value The research results of this paper have great practical value in the process and material of improving the wear resistance and anti-friction performance of the drill pipe joint casing.
21
Huang, Zhiqiang, Zhongquan Yin e Wei Wu. "Experimental research on improving the wear resistance and anti-friction properties of drill pipe joints". Industrial Lubrication and Tribology 73, n. 9 (3 ottobre 2021): 1198–208. http://dx.doi.org/10.1108/ilt-06-2021-0232.
Testo completoAbstract (sommario):
Purpose The purpose of this study is to solve the oil drill pipe joints and casing excessive wear problems and to improve the drill pipe joint-casing wear resistance and anti-friction properties. Design/methodology/approach On the surface of the drill pipe joints using oxyacetylene flame bead weld (BW) wear-resistant welding wire ARNCO-100XTTM prepares welding layer, high-velocity oxygen fuel (HVOF) Cr3C275-NiCr25 prepares coating and subsonic flame spray and remelt (SFSR) Ni60 prepares coating, then comparing and analyzing the friction and wear of the three types of wear-resistant layers and the casing under the condition of 1.8 g/cm3 mud drilling fluid lubrication. The wear resistance and anti-friction performance of the drill pipe joints were evaluated based on the wear situation, finally revealing its friction and wear mechanisms. Findings Three types of wear-resistant layers can improve the surface wear resistance of drill pipe joints, the wear-resistant layer and the substrate are well combined and the welding layers and coating are both dense and uniform. The wear resistance of the HVOF-Cr3C275-NiCr25 coating is 10.9 times that of the BW-ARNCO-100XTTM weld layer, and the wear resistance of the SFSR-Ni60 weld layer is 2.45 times that of the BW-ARNCO-100XTTM weld layer. The anti-friction properties of SFSR-Ni60 welding layer is the best, followed by HVOF-Cr3C275-NiCr25 coating, and the anti-friction properties of BW-ARNCO-100XTTM welding layer is the worst among the three. Originality/value The research results of this paper have great practical value in the process and material of improving the wear resistance and anti-friction performance of the drill pipe joint casing.
22
Akhigbemidu, Christopher Osinmen, e John U. Okoli. "Development of a Double Beam Model for Predicting Intrusion in Pipelines". Advanced Materials Research 824 (settembre 2013): 379–93. http://dx.doi.org/10.4028/www.scientific.net/amr.824.379.
Testo completoAbstract (sommario):
This paper examines pipeline safety and develops a mathematical model for predicting illegal intrusion. The model idealizes a typical pipeline structure as a pipe-in-pipe double beam, consisting of the process pipe encased in a larger diameter outer carrier pipe resting on an elastic soil foundation. Intrusion is considered to consist of hammering and cutting activities on the casing pipe which transmits shock motion to the process pipe. From the solution feedback control algorithms have been proposed for designing surveillance instruments which assist in mitigating the problem of illegal intrusion for harvesting of crude oil. A point sensor was used to simulate the response to intrusive hammering action induced on the casing pipe in a 2 m segment of the process pipe in an example. Sensor was conFigureured to measure displacement response at intervals of 2 seconds at (0.00, 0.06, 0.12,..., 2.00) m sampling points. The displacements indicated within the model assumption of zero damping, were 4.62 x 10-4m and 4.24 x 10-4m at the left and right hand anchors. A deflection of around-2.67 x 10-4m was obtained at 0.94 m.
23
Trykoz, L. V., S. M. Kamchatnaya, O. M. Pustovoitova e A. O. Atynian. "The Investigation of Prestressed Pressure Pipes, Reinforced with Fiberglass Plastic". International Journal of Engineering Research in Africa 36 (giugno 2018): 1–11. http://dx.doi.org/10.4028/www.scientific.net/jera.36.1.
Testo completoAbstract (sommario):
The problem of a combined action of reinforced concrete pipe and fiberglass safety cage. The prestressed cage not only decreases deformability of a pipe under load but protects the material of a pipe from agressive external factors. The process of force transfer from concrete pipe and fiberglass has been analyzed and the equation of stress and deformation for pipes and fiberglass has been deduced. It is shown that stress in fiberglass does not remain constant varying wall thickness, reducing towards the concrete core. Hoop stresses in the concrete core increase towards the centre of a pipe. Unlike known solutions the performed calculations take into account the performance of both layers – concrete and fiberglass. The total stresses in a concrete pipe in the most dangerous section from internal pressure and the reduction by fiberglass winding have been determined. The results obtained in the given work provide with the possibility of modelling long-term properties of composite reinforced concrete constructions and optimization of winding angle of fiberglass casing depending on the diameter of a pipe, tension force and the quantity of reinforcing filler.
24
Wang, Zhe, Pingquan Wang, Dezhi Zeng, Taihe Shi e Wenliang Deng. "A Study on the Influential Factors of Stress Corrosion Cracking in C110 Casing Pipe". Materials 15, n. 3 (21 gennaio 2022): 801. http://dx.doi.org/10.3390/ma15030801.
Testo completoAbstract (sommario):
In this paper, we analyze the potential factors affecting the hydrogen sulfide type of stress corrosion cracking in C110 casing pipes. In order to further study these cracking factors, the methods of material property testing, scanning electron microscopy, XRD, TEM, and 3D ultra-depth-of-field were applied in the experiments. Besides that, an HTHP autoclave was independently designed by the laboratory to simulate the actual corrosion environment, and the potential factors affecting the stress corrosion cracking of C110 casing pipes were determined. The test results showed that the chemical composition, metallographic structure, hardness, and non-metallic inclusions of the two types of C110 casing pipes were all qualified. In fact, there remains a risk of stress corrosion cracking when the two kinds of C110 casing pipes serve under long-term field-working conditions. It is considered in this paper that the precipitates on the material surface, stress damage, and pitting corrosion are all critical factors affecting the stress corrosion cracking of casing pipes.
25
Veselov, I. N., I. Yu Pyshmintsev, A. I. Stepanov e I. N. Ashikhmina. "Production of high-strength H2S-Resistant casing pipe". Steel in Translation 39, n. 7 (luglio 2009): 593–96. http://dx.doi.org/10.3103/s0967091209070201.
Testo completo
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Song, Sheng Zhi, Jian Jun Wei e Wu Sun. "Analysis of Static Strength for Tubular Joint Reinforced with Collar Casing Pipe". Applied Mechanics and Materials 578-579 (luglio 2014): 627–30. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.627.
Testo completoAbstract (sommario):
To improve the static strength of tubular T-joint, the method of reinforcing with collar casing pipe is proposed. The finite element analysis (FEA) models of reinforced and unreinforced tubular joints built by FEA software (ABAQUS) are calculated to investigate the improving efficiency under axial compression and tension. It is found that collar casing pipe can improve the static strength of tubular joint effectively. Afterwards, based on the mechanism analysis of tubular T-joint models, the failure modes and different performances between reinforced and unreinforced models are clarified.
27
Alexeev, Sergey E., e Evgeny M. Chernienkov. "DRILLING BOREHOLES WITH SIMULTANEOUS CASING". Interexpo GEO-Siberia 2, n. 3 (21 maggio 2021): 107–14. http://dx.doi.org/10.33764/2618-981x-2021-2-3-107-114.
Testo completoAbstract (sommario):
The conditions for applying the method of drilling boreholes with simultaneous casing are considered. The most used tool designs, their advantages and disadvantages are shown. Present-day requirements for this tool are indicated. A new design is presented, which allows further drilling through the casing pipe of maximum possible diameter, simulation results are given. The operation of the device is described and a diagram of its use is presented.
28
Samuel, Robello. "Technology Focus: Wellbore Tubulars (July 2021)". Journal of Petroleum Technology 73, n. 07 (1 luglio 2021): 50. http://dx.doi.org/10.2118/0721-0050-jpt.
Testo completoAbstract (sommario):
How we think about the future of the pipe industry must evolve. How must tubular design and manufacturing change as we transition to clean energy? Geothermal energy is an area that needs attention and, further, needs very specific attention on tubulars. Tubulars are an important component in the construction of geothermal wells, and we must align our requirements for geothermal energy. Some of the main challenges encountered in geothermal wells are corrosion and scaling. Moreover, temperature becomes a major consideration for tubulars, even more so with the temperature excursion during geothermal production. Perhaps the critical aspect in the design of the geothermal wells involves casing selection and design. Beyond manufacturing casing pipes to withstand these problems, considering the manufacturing of other components, such as connections, float collars, and float shoes, also is essential. Thermal expansion and thermal excursion of casings are well-integrity concerns; thus, casing design is important for long-term sustainability of geothermal wells. Apart from thermal simulations, guidelines and software are needed to undergird the designs to withstand not only temperature excursions but also thermomechanical and thermochemical loadings. Engineered nonmetallic casings also provide an alternative solution because they provide the desired strength and corrosion resistance in addition to meeting the goals of sustainability. Undoubtedly, the future of the tubular industry is going to be revitalized. The question now is how we can retrofit existing abandoned wells for this purpose. Recommended additional reading at OnePetro: www.onepetro.org. SPE 199570 - Special Considerations for Well-Tubular Design at Elevated Temperatures by Gang Tao, C-FER Technologies, et al.
29
Augustin, A. M., W. D. Kennedy, H. F. Morrison e K. H. Lee. "A theoretical study of surface‐to‐borehole electromagnetic logging in cased holes". GEOPHYSICS 54, n. 1 (gennaio 1989): 90–99. http://dx.doi.org/10.1190/1.1442581.
Testo completoAbstract (sommario):
A new electromagnetic logging method, in which the source is a horizontal loop coaxial with a cased drill hole and the secondary axial fields are measured at depth within the casing, has been analyzed. The analysis, which is for an idealized model of an infinite pipe in a conductive whole space, has shown that the casing and formation are uncoupled at the low frequencies that would be used in field studies. The field inside the casing may be found by first finding the field in the formation and then using this field as an incident field for the pipe alone. This result permits the formation response to be recovered from the measured field in the borehole by applying a correction for the known properties of the casing. If the casing response cannot be accurately predicted, a separate logging tool employing a higher frequency transmitter could be used to determine the required casing parameters in the vicinity of the receiver. This logging technique shows excellent sensitivity to changes in formation conductivity, but it is not yet known how well horizontal stratification can be resolved. One of its most promising applications will be in monitoring, through repeated measurements, changes in formation conductivity during production or enhanced recovery operations.
30
KONDRATENKO, Andrei. "Technological aspects of cased wells construction with cyclical-flow transportation of rock". Journal of Mining Institute 246 (23 gennaio 2021): 610–16. http://dx.doi.org/10.31897/pmi.2020.6.2.
Testo completoAbstract (sommario):
A high-performance technology for constructing cased wells is proposed. Essence of the technology is the advance insertion of the casing pipe into the sedimentary rock mass and the cyclical-flow transportation of the soil rock portions using the compressed air pressure supplied to the open bottomhole end of the pipe through a separate line. Results of mathematical modeling for the process of impact insertion of a hollow pipe into a soil mass in horizontal and vertical settings are considered. Modeling of the technology is implemented by the finite element method in the ANSYS Mechanical software. Parameters of the pipe insertion in the sedimentary rock mass are determined - value of the cleaning step and the impact energy required to insert the pipe at a given depth. Calculations were performed for pipes with a diameter from 325 to 730 mm. Insertion coefficient is introduced, which characterizes the resistance of rocks to destruction during the dynamic penetration of the casing pipe in one impact blow of the pneumatic hammer. An overview of the prospects for the application of the proposed technology in geological exploration, when conducting horizontal wells of a small cross-section using a trenchless method of construction and borehole methods of mining, is presented. A variant of using the technology for determining the strength properties of rocks is proposed. Some features of the technology application at industrial facilities of the construction and mining industry are considered: for trenchless laying of underground utilities and for installing starting conductors when constructing degassing wells from the surface in coal deposits. Results of a technical and economic assessment of the proposed technology efficiency when installing starting conductors in sedimentary rocks at mining allotments of coal mines are presented.
31
Gorozhanin, P. Yu, E. S. Chernykh, V. A. Khotinov, S. Yu Zhukova e V. M. Farber. "Development of steel and production conditions for pump-compressor pipe and casing pipe". Steel in Translation 37, n. 8 (agosto 2007): 673–75. http://dx.doi.org/10.3103/s0967091207080062.
Testo completo
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Afandiyev, Emin Musa, e Mahammadali Nuraddin Nuriyev. "ANALYSIS OF THE CONDITION OF A PIPE FIXED IN A CLAMPING DEVICE". EUREKA: Physics and Engineering, n. 1 (29 gennaio 2021): 78–85. http://dx.doi.org/10.21303/2461-4262.2021.001587.
Testo completoAbstract (sommario):
Due to the fact that clamping devices are widely used in various industries, the requirements for the operation of such devices are constantly increasing. This is due to an increase in the general requirements for processing accuracy, as well as an increase in the forces acting on the clamped part. The reliability of these devices when working with thin-walled cylindrical parts is of great importance.
Thin-walled cylinders used in mechanical engineering are subject to significant loads. With prolonged exposure to loads from clamping forces, as well as from axial tensile forces, plastic deformations of cylindrical parts occur. In the oil and gas industry, when clamping drill and casing pipes in some areas in the capture zone, stresses exceed the yield strength. Multiple clamping of the pipe will reduce the pipe wall in the gripping area, which causes premature pipe failure. Therefore, increasing the holding capacity of clamping mechanisms is relevant.
Analysis of broken drill pipes, which have been operating in wedge grips for a long time, showed that in most cases the pipes undergo plastic deformation caused by damage to the pipe surface by the teeth of the ram. To clarify the actual conditions of loading the pipe and the possibilities of increasing the capacity of the clamping devices, studies of the contact pressures in the clamping zone were carried out.
A new pipe clamping chuck is also presented, which provides a sufficiently high reliability of fastening of cylindrical parts.
33
Kovbasiuk, I. M., I. I. Chudyk, O. B. Martsynkiv e M. B. Seniushkovych. "Experimental research of the conditions for the transfer of rock pressure by saliniferous rocks to the casing". Prospecting and Development of Oil and Gas Fields, n. 3(80) (30 settembre 2021): 53–59. http://dx.doi.org/10.31471/1993-9973-2021-3(80)-53-59.
Testo completoAbstract (sommario):
The analysis of field data from casing failure on the fields of the Borislav and Dolinsky oilfield regions has been carried out. It has been found that the most significant negative factors that have a bearing on the preservation of the integrity of the casing strings are the presence of saliniferous rock intervals in the borehole log and not taking into account the possible impact of rock pressure when designing casing strings in these rocks. In saliniferous rocks, under certain conditions, rock pressure can be transferred to the column. To study the thermobaric conditions of the external pressure transfer to the casing from the saliniferous rock, experimental tests have been carried out on the core materials of the rocks of the Vorotyshchensk floor, sampled at different depths of the Oriv-Ulychniansk field. For this purpose, a special laboratory installation was made, which allows to study the stress conditions and rock flowage on exposure to formation temperature and rock pressure. Because it was difficult to directly measure the radial pressure transmitted to the pipe and the temperature inside the chamber during the experiments, the installation was calibrated by pressure and temperature. This made it possible to determine the temperature inside the chamber by the value of the voltage supplied to the heating element, and the value of the radial pressure supplied to the pipe - by the value of the pressure inside the pipe. Based on the results of experimental research, the depen-dences of the lateral earth pressure coefficient of saliniferous rocks on temperature were obtained at various values of normal stresses. It was found that when the temperature rises to 70 ° C and higher, the value of the lateral external pressure on the pipe approaches the vertical component of the pressure. According to the results of the experimental research, the temperature and pressure conditions for accounting for rock pressure were recommended when calculating casing strings for external overpressure in the intervals of occurrence of saliniferous rocks of the Carpathian fields.
34
Zhang, Hong, Quan Luo, Xu Hui Liu, Peng Wang e Ding Feng. "Fracture Failure Analysis of N80 Q Marine Casing". Applied Mechanics and Materials 318 (maggio 2013): 331–35. http://dx.doi.org/10.4028/www.scientific.net/amm.318.331.
Testo completoAbstract (sommario):
The 13-3/8〞casing of a well was bent down and broken off in the marine development completion process. The cause for the fracture is systematically analyzed by means of chemical composition analysis, mechanical properties testing, macro and micro fracture analysis and metallographic analysis. The results indicate that, the heterogeneity of the casing material and large oxide metallurgical inclusions found in fracture place severely reduce the properties of the material, which lead to the failure of casing pipe in bad service environment.
35
Li, Jianbo. "Water Inrush from Pregrouting Fractures Induced by Mining Activities and Its Engineering Control Method Optimization". Advances in Civil Engineering 2019 (7 maggio 2019): 1–10. http://dx.doi.org/10.1155/2019/6243609.
Testo completoAbstract (sommario):
Water inrush accidents during coal mining still occur after reinforcement of fissured water bearing strata underlying coal seams through grouting, which seriously troubles field technicians. In order to further prevent the water inrush, especially the water inrush after grouting reinforcement, the grouting technique needs to be improved. Experimental design, theoretical analysis, and numerical simulation have been carried out in sequence. On the microscale level, the relationship between strains and water flow rate was analyzed through laboratory experiments; on the macroscale level, the propagation mechanism of grouting cracks resulting from the rock strata deformation during coal production was analyzed with rock beam theory, and then a new model of casing pipes preventing water inrush by controlling deformation of the floor rock strata is proposed. The laboratory test results show that the response of the radial strain and the water flow rate to mining operation is consistent and positively correlated and verify that it is feasible to reduce water inrush disaster by controlling deformation of the rock strata. The deformation governing equation of the casing pipes is deduced theoretically. At last, the numerical calculation was done to prove the effectiveness of controlling the floor rock strata deformation by the casing pipe group, which indicated that the displacement of the monitoring points after grouting is smaller than that before grouting practice. It is practicable to realize grouting technique optimization by the innovative adoption of the grouting casing pipes in the future.
36
Arvin, Arvin, e Aniek Prihatiningsih. "STUDI FONDASI TIANG BOR UNTUK JEMBATAN DI LAUT". JMTS: Jurnal Mitra Teknik Sipil 4, n. 3 (2 settembre 2021): 581. http://dx.doi.org/10.24912/jmts.v0i0.11062.
Testo completoAbstract (sommario):
Structurally, the bridge is separated into the upperstructure, and substructure such as foundation. According to its function, the foundation of the bridge supports and transmits the load from the superstructure to a strong and stable layer of soil. The construction of a bridge at sea has a high level of difficulty and risk. There are forces that influence the foundation at sea. The greater the loads that are held by the foundation, the greater the bearing capacity required for the foundation. The foundation used the bored pile casing method. The concept of a bored pile foundation casing method itself uses a steel casing pipe that is installed to a specified depth. This method is used when the borehole is very prone to landslides, so it is very suitable to be applied to soil which is sand below the groundwater level or at sea. In this paper, we will discuss the bearing capacity of the bored pile foundation and the loads that affect the bearing capacity of the foundation. Bearing capacity includes axial and lateral bearing capacity. So the results of this study will show how much effective bearing capacity must be considered when creating a foundation for bridges at sea.Secara struktural jembatan dipisahkan menjadi struktur atas, dan struktur bagian bawah seperti fondasi. Sesuai fungsinya, fondasi jembatan menopang dan meneruskan beban dari bangunan atas jembatan ke lapisan tanah yang kuat dan stabil/solid. Pembangunan jembatan panjang di tengah laut memiliki tingkat kesulitan dan resiko tinggi. Terdapat gaya-gaya yang mempengaruhi fondasi yang dibuat di laut. Semakin besar beban-beban yang ditahan fondasi maka semakin besar pula daya dukung yang dibutuhkan fondasi. Fondasi yang dipakai adalah fondasi tiang bor dengan metode casing. Konsep dari fondasi tiang bor metode casing sendiri menggunakan pipa selubung baja (casing) yang diinstall sampai kedalaman yang ditentukan. Metode ini digunakan bila lubang bor sangat mudah longsor, sehingga sangat cocok untuk diaplikasikan pada tanah yang merupakan pasir di bawah muka air tanah atau di laut. Pada penulisan ini akan dibahas mengenai daya dukung fondasi tiang bor dan beban-beban yang mempengaruhi daya dukung fondasi tersebut. Daya dukung mencakup daya dukung aksial dan lateral. Sehingga hasil studi ini akan menunjukan seberapa besar daya dukung efektif yang harus dipertimbangkan pada saat ingin membuat fondasi untuk jembatan di laut.
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Zhang, Jie, Zaipeng Zhao, Xin Li, Yundong Zheng, Cuinan Li, Zhilin Li e Xu Liu. "Research on the mechanism of the influence of flooding on the killing of empty wells". Journal of Petroleum Exploration and Production Technology 11, n. 9 (19 agosto 2021): 3571–98. http://dx.doi.org/10.1007/s13202-021-01265-4.
Testo completoAbstract (sommario):
AbstractIn empty well killing, in order to save the time and cost of killing the well, the dynamic replacement method is often used to kill the well. The main problem of the dynamic replacement method for killing wells is how to avoid terrible working conditions caused by flooding, such as gas carrying fluid, killing fluid being brought to the wellhead. Based on the principle of flooding formation and the basic tenets of flooding correlation experiment and dynamic replacement method, this paper incorporates the kill fluid viscosity, surface tension, droplet diameter, inclination angle, drill pipe joint outer diameter, and drill pipe eccentricity into the calculation range and establishes a new mathematical model suitable for dynamic replacement kill. Based on the calculation results, the influencing factors of flooding are analyzed, and the following conclusions are drawn: the increase of dynamic viscosity, gas density in the well, casing pressure, well angle, the outside diameter of drill pipe, the outer diameter of drill pipe joint, and eccentricity of drill pipe can promote the occurrence of flooding; The increase of surface tension, well-killing fluid density, and casing inner diameter have an obstacle to flooding.
38
Sobolenko, Oleksandr, Petro Drozhzha, Nataliia Dorosh e Lina Petrechuk. "ACCURACY WALL SICKNESS OF HOT-DEFORMED PIPES STATISTICAL ANALISIS". Modern Problems of Metalurgy, n. 23 (27 marzo 2020): 113–20. http://dx.doi.org/10.34185/1991-7848.2020.01.11.
Testo completoAbstract (sommario):
Pipe-rolling units with an automatic mill are a aggregate production complex that produces hot-rolled pipes of various sizes. The technological process of seamless pipes production, has many stages: flashing the billet into a sleeve, longitudinal rolling in gauge, running in a oblique rolling mill, calibrating and reducing the diameter. Each stage significantly affects the accuracy of the geometric dimensions of the pipes. One of the main parameters characterizing the accuracy of the pipes is their transverse difference namely the size and the nature of the distribution of the pipe wall thickness in the cross section. A significant reserve for saving metal is increasing the accuracy of seamless pipes to avoid different pipe wall thickness. Different pipe wall thickness makes it difficult to get quality pipe screw-thread.The conditions of metal deformation at an injection molding machine with an automatic machine do not exclude the presence of fluctuation of the pipe wall thickness. The best characteristic of the accuracy of finished pipes will be the knowledge of quantitative indicators of the transverse difference of their end sections. The purpose of this work is to determine the variation in wall thickness of hot-rolled casing by means of mathematical statistics methods.The use of statistical data processing methods makes it possible to predict the seamless pipe difference indicator. A statistical analysis of the wall thickness indicator of the end sections showed a high ratio of wall thickness symmetry. An effective way to minimize the symmetric difference component is to optimize the deformation modes along the pipe wall. In this case, a graphical analysis of the distribution of wall thickness showed that the actual difference varies in stochastic dependence. To clarify the general form of the random periodic component of such a dependence, it is advisable to apply methods of harmonic analysis, which will allow us to develop a mathematical model for determining the accuracy of pipes.
39
Liang, Lin, Ting Lei, Adam Donald e Matthew Blyth. "Physics-Driven Machine-Learning-Based Borehole Sonic Interpretation in the Presence of Casing and Drillpipe". SPE Reservoir Evaluation & Engineering 24, n. 02 (12 febbraio 2021): 310–24. http://dx.doi.org/10.2118/201542-pa.
Testo completoAbstract (sommario):
Summary Interpretation of sonic data acquired by a logging-while-drilling (LWD) tool or wireline tool in cased holes is complicated by the presence of drillpipe or casing because those steel pipes can act as a strong waveguide. Traditional solutions, which rely on using a frequency bandpass filter or waveform arrival-time separation to filter out the unwanted pipe mode, often fail when formation and pipe signals coexist in the same frequency band or arrival-time range. We hence developed a physics-driven machine-learning-based method to overcome the challenge. In this method, two synthetic databases are generated from a general root-finding mode-search routine on the basis of two assumed models: One is defined as a cemented cased hole for a wireline scenario, and the other is defined as a steel pipe immersed in a fluid-filled borehole for the logging-while-drilling scenario. The synthetic databases are used to train neural network models, which are first used to perform global sensitivity analysis on all relevant model parameters so that the influence of each parameter on the dipole dispersion data can be well understood. A least-squares inversion scheme using the trained model was developed and tested on synthetic cases. The scheme showed good results, and a reasonable uncertainty estimate was made for each parameter. We then extended the application of the trained model to develop a method for automated labeling and extraction of the dipole flexural dispersion mode from other disturbances. The method combines the clustering technique with the neural-network-model-based inversion and an adaptive filter. Testing on field data demonstrates that the new method is superior to traditional methods because it introduces a mechanism from which unwanted pipe mode can be physically filtered out. This novel physics-driven machine-learning-based method improved the interpretation of sonic dipole dispersion data to cope with the challenge brought by the existence of steel pipes. Unlike data-driven machine learning methods, it can provide global service with just one-time offline training. Compared with traditional methods, the new method is more accurate and reliable because the processing is confined by physical laws. This method is less dependent on input parameters; hence, a fully automated solution could be achieved.
40
Gavryliv, S. Yu, M. M. Lyakh e Yu L. Gavryliv. "CAM FITTING UNIT OF DEVICEFOR UNSCREWING CATCHED PIPES IN THE WELL". PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Number, n. 1(59) (28 gennaio 2021): 151–64. http://dx.doi.org/10.31471/2304-7399-2020-1(59)-151-164.
Testo completoAbstract (sommario):
Improving the efficiency of repair work in elimination of drilling pipe accidents in the well is an urgent task of oil companies and is achieved through usage of special devices and tools. Authors patented and manufactured a device for unscrewing pipes in casing with a nominal diameter of D = 114 mm. Cycle of the device for unscrewing pipes in the well consists of three periods: freewheeling, jamming of the carrier of the device for unscrewing the trapped pipes and the period of wedging. The article analyses the operating conditions of the device locking unit during the first two periods. Formulas for determining the force of pressing the cams to the casing during freewheel, as well as the moment of friction forces and friction power for this case are proposed. We obtain the dependence of the maximum allowable initial angle of jamming on the coefficient of friction and geometric parameters of the device.
It is planned to test the device for unscrewing pipes in industrial conditions of LLC "Factorial" (Poltava).
41
Gerstle, Walter, Tess McCarty Glenn, Stephen F. Dwyer e John H. Gerstle. "Leakage from drill pipe casing subject to shear deformation". International Journal of Petroleum Engineering 1, n. 1 (2014): 49. http://dx.doi.org/10.1504/ijpe.2014.059420.
Testo completo
42
Kryzhanivskyy, Ye I., D. G. Chornopyskyy e І. I. Paliichuk. "Stress Concentration in the Casing when Cutting Holes for the Sidetracks". Prospecting and Development of Oil and Gas Fields, n. 3(72) (30 settembre 2019): 7–18. http://dx.doi.org/10.31471/1993-9973-2019-3(72)-7-18.
Testo completoAbstract (sommario):
Directional drilling of complementary holes in a cased well is an effective method of restoring decommissioned, emergency and abandoned wells. It enables the possibility to save on drilling new oil and gas wells. Today, sidetracking is considered to be the most efficient technology which makes use of milling casing window. Cutting into the column wall is a very important process. The milling cutter makes a slot-like hole in it due to the force response of the wedge deflection device in the casing. The upper part of the hole becomes elliptical with a smooth contour due to the small angle of the wedge during the axial moving of the tool. At the same time, the lower edge of the hole is straight and forms right angles with its side edges. The vertices of these angles create a stress concentration in the wall, weakened by the hole, under the condition that a significant tensile force of its own weight acts on the casing. These stresses reach their maximum values in those pipe cross-sections where the window width becomes maximum (design), and their area is the smallest one. The topicality and novelty of the solved problem lie in studying the stress-deformed state of the casing pipe under tension while cutting a window, close to a rectangular shape, in its wall, as well as in calculating the maximum stresses that arise around the right angles of the hole. These solutions make it possible to specify stress concentration factors depending on the geometrical parameters of the hole, and thereby ensure the development of engineering methods for designing a trouble-free process for window cutting in casing pipes. The operating results are as follows: a developed mathematical model of a nonaxisymmetric stress state that occurs during tension-compression of a cylindrical shell with rectangular holes, for which the analytical methods of calculating the stress-strain state of non-thin shells with non-canonical stress concentrators have been used, and theoretical and experimental studies of the stress concentration in the walls of this shell.
43
Van Wittenberghe, Jeroen, Jan De Pauw, Patrick De Baets, Wim De Waele, Wouter Ost, G. De Roeck e T. T. Bui. "Fatigue investigation of threaded pipe connections". International Journal Sustainable Construction & Design 1, n. 1 (6 novembre 2010): 182–89. http://dx.doi.org/10.21825/scad.v1i1.20424.
Testo completoAbstract (sommario):
Threaded pipe connections are used to connect well casing, well tubing, drill pipes and risers.For many of these applications fatigue resistance plays an important role. In this study the fatigueproperties of threaded connections are studied using a combination of finite element modelling andexperimental testing. Using 2D axisymmetric FE analysis several connections are compared. It is shownthat the load distribution over the engaged threads is an important feature. Experimental tests are carriedout on three setups. A small scale four-point bending setup is used to develop S-N curves. An S-N curve fora standard API Line Pipe connection is compared to an S-N curve for a connection that showed animproved load distribution over the engaged threads in the FE analysis. On a medium scale four-pointbending setup, strains together with crack opening are measured. The strain measurements are comparedwith the strains obtained by the numerical model. Finally a full scale resonant bending fatigue setup ispresented, which will be used in future testing of pipe connections ranging from 168 mm (6”) to 508 mm(20”) in diameter.
44
Dzhabbarov, S. N., e E. I. Pryakhin. "Development of Heat Treatment Mode with Quenching in Different Quenching Environments for the Casing Pipe in Order to Obtain the Required Mechanical Properties". Key Engineering Materials 836 (marzo 2020): 41–45. http://dx.doi.org/10.4028/www.scientific.net/kem.836.41.
Testo completoAbstract (sommario):
Development of an optimal technology of heat treatment for blanks of the casing pipe made of steel 40H (GOST 4543) is used in the oil and gas industry for casing. It is accompanied by quenching in various environments to ensure guaranteed obtainment of the required mechanical characteristics. These characteristics are specified in GOST 632-80 and met in order to improve the properties of the 40H steel.
45
Kou, Guang Xiao, Rong Rong Lu, Jing Hua Yang, Ling Ling Cai e Pei Na Shang. "Discussions on the Methods of Preventing Heat Transfer Fluids from Oxidation in Open Heating System Based on Liquid-Phase Organic Heat Transfer Fluids Heater". Advanced Materials Research 1070-1072 (dicembre 2014): 1722–26. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1722.
Testo completoAbstract (sommario):
Introduces the technological process of the open heating system with a liquid-phase organic heat transfer fluids heater by analyzing the advantages and disadvantages of preventing heat transfer fluids from oxidation based on expansion pipe with cooling water casing. And it presents two methods to prevent heat transfer fluids from oxidation by arranging directly cooling coils or pulsating heat pipes in the expansion tank; it also provides the schematic diagram of those methods as well as comparatively analyzes their advantages and disadvantages.
46
Huang, Zi Qian, e Qing Lian Xie. "Study on Thermal Stresses of Cylinder Liner’s Fabrication Using FEM Analysis". Advanced Materials Research 189-193 (febbraio 2011): 2058–61. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2058.
Testo completoAbstract (sommario):
In the process of casing casting, great temperature gradient leads to contraction deformation of cylinder liner, which influences the quality of products. The thermal stresses caused by temperature gradient were analyzed by finite element method. The numerical results show that high equivalent Von Mises stress(242MPa) occurs in the surface zone of the cylinder liner as Cooling down to room temperature within pipe die ,also there is plastic deformation in the internal and external surface zone. Reducing the cooling speed, decreasing the temperature gradient and aging can reduce the influence of thermal stresses.
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Zhi, Zhang, Tai Ping Xiao e Jian Hong Fu. "Study on Well-Kill Calculation Model with Deep-Water Engineer’s Method". Advanced Materials Research 393-395 (novembre 2011): 996–99. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.996.
Testo completoAbstract (sommario):
With the growing demand for oil and gas resources of China, exploration and development face more complex situation and there is an urgent need to move to (deeper than 1000m) deep sea oil and gas exploration and development. As the density window for safe drilling fluid is narrow, the mud line is in high pressure and low temperature environment, and the cycle pressure loss in choker line is larger and other characteristics, Well-kill calculation model with deep-water engineer’s method is disparate with that for land. To this end, combined with the special formation conditions in deep water well control and the characteristics of long choke line, on the basis of considering the impact of the friction of choker line, gas compressibility factor, temperature and other parameters on the casing pressure and stand-pipe pressure, well-kill pressure parameters (including stand-pipe pressure, casing pressure, maximum casing pressure, etc.) calculation model of deep-water engineer’s method is established to carry out example calculation, which has directive significance for on-site well-kill construction.
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Dumitrescu, Andrei, Mihail Minescu, Alin Dinita e Ionut Lambrescu. "Corrosion Repair of Pipelines Using Modern Composite Materials Systems: A Numerical Performance Evaluation". Energies 14, n. 3 (26 gennaio 2021): 615. http://dx.doi.org/10.3390/en14030615.
Testo completoAbstract (sommario):
Pipe corrosion is a frequent phenomenon, and if repairs are delayed it could lead to environmental damage. Drilling activities can expand only when sufficient surface transportation capacity for the produced fluids exists and thus good maintenance of the transportation system is important. Furthermore, the technology presented herein can be easily upgraded as a repair solution for surface casing section below the casing head, which have been repeatedly reported as being highly corroded for older wells. This paper presents the results of the research work carried out by the authors in order to evaluate the design methods of the modern composite material systems used to repair steel pipes carrying hydrocarbons upon which local metal loss defects (generated by corrosion and/or erosion processes) have been detected. The pipe repair technologies consisting of the application of composite material wraps (made of a polymeric matrix and reinforcing fabric) are perceived as being advantageous alternative solutions for substituting the conventional technologies, which require welding operations to be performed in the corroded pipe areas. The performance and the design methods of the composite repair systems have been investigated by evaluating the reinforcement effects (the restoration level of the damaged pipe mechanical strength) generated by the applied composite wraps as a function of their geometry and mechanical properties. To that purpose, numerical models based on finite elements (previously developed by the authors and certified by comparing them with the results of several experimental programs performed within our university) have been used. The calculation methods proposed in literature (among which a method previously proposed by the authors) to define the composite wrap dimensions (thickness and length) for a given pipe have been compared to the numerical results in order to select the most adequate solution for the design of the composite repair system. The influence in the design process of the defect orientation and of its width has also been investigated.
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Da Soghe, Riccardo, Bruno Facchini, Mirko Micio e Antonio Andreini. "Aerothermal Analysis of a Turbine Casing Impingement Cooling System". International Journal of Rotating Machinery 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/103583.
Testo completoAbstract (sommario):
Heat transfer and pressure drop for a representative part of a turbine active cooling system were numerically investigated by means of an in-house code. This code has been developed in the framework of an internal research program and has been validated by experiments and CFD. The analysed system represents the classical open bird cage arrangement that consists of an air supply pipe with a control valve and the present system with a collector box and pipes, which distribute cooling air in circumferential direction of the casing. The cooling air leaves the ACC system through small holes at the bottom of the tubes. These tubes extend at about 180° around the casing and may involve a huge number of impinging holes; as a consequence, the impinging jets mass flow rate may vary considerably along the feeding manifold with a direct impact on the achievable heat transfer levels. This study focuses on the performance, in terms of heat transfer coefficient and pressure drop, of several impinging tube geometries. As a result of this analysis, several design solutions have been compared and discussed.
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Cao, Yin Ping, Yi Hua Dou e Yang Yu. "Stress Analysis of Internal Wall Worn Casing String under Uniform Earth Pressure Based on ANSYS". Applied Mechanics and Materials 152-154 (gennaio 2012): 912–19. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.912.
Testo completoAbstract (sommario):
Wear of casing string is a common phenomenon in the process of oil and gas exploitation, and it reduces collapse and burst strength of casing string. Stress of internal wall worn casing string must be analyzed to ensure strength of casing string. In the paper, wear form of casing string is assumed as a crescent-shape, and a half finite element model (FEM) of worn casing string, cement-loop and earth combined system is established using the symmetry. Geometry relationships of wear ratio (or wear depth) and the centre of drill pipe are established. Effects of variables such as wear ratio of casing string, magnification factor of wellbore, elastic modulus of cement-loop and working conditions on casing string stress are discussed respectively. Some conclusions are drawn: maximum stress in casing string increases with increased wear ratio of casing string, and ultimately exceeds the yield limit. Increase of magnification factor of wellbore will improve bearing capacity of casing string, but maximum stress in casing string decreases slower and slower with further increase in magnification factor of casing string, at the same time, stress decreases more in casing string than in cement-loop. Minimum stress in cement-loop increases and maximum stress in cement-loop fluctuates with increased elastic modulus of cement-loop, while both minimum and maximum stress in casing string first increases then decreases, the turning point is related to elastic modulus of casing string and earth, as well as the geometry relationships among them. The bigger pressure difference, the larger maximum stress exists in casing string.