Journal articles: 'Hole cleaning'

1

Ahmed, Ramadan M., and Nicholas E. Takach. "Fiber Sweeps for Hole Cleaning." SPE Drilling & Completion 24, no. 04 (2009): 564–73. http://dx.doi.org/10.2118/113746-pa.

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Carpenter, Chris. "Hole-Cleaning Fibers Improve Cuttings-Carrying Capacity." Journal of Petroleum Technology 73, no. 05 (2021): 63–64. http://dx.doi.org/10.2118/0521-0063-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 203147, “Investigating Hole-Cleaning Fibers’ Mechanism To Improve Cutting Carrying Capacity and Comparing Their Effectiveness With Common Polymeric Pills,” by Mohammad Saeed Karimi Rad, Mojtaba Kalhor Mohammadi, SPE, and Kourosh Tahmasbi Nowtarki, International Drilling Fluids, prepared for the 2020 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, held virtually 9–12 November. The paper has not been peer reviewed. Hole cleaning in deviated wells is more challenging than in vertical wells because of the boycott effect or the eccentricity of the drillpipe. Poor hole cleaning can result in problems such as borehole packoff or excessive equivalent circulating density. The complete paper investigates a specialized fibrous material (Fiber 1) for hole-cleaning characteristics. The primary goal is to identify significant mechanisms of hole-cleaning fibers and their merits compared with polymeric high-viscosity pills. Hole-Cleaning Indices Based on a review of the literature, most effective parameters regarding hole cleaning in different well types were investigated. These parameters can be classified into the following five categories: - Well design (e.g., hole angle, drillpipe eccentricity, well trajectory) - Drilling-fluid properties (e.g., gel strength, mud weight) - Formation properties (e.g., lithology, cutting specific gravity, cuttings size and shape) - Hydraulic optimizations (e.g., flow regime, nozzle size, number of nozzles) - Drilling practices (e.g., drillpipe rotation speed, wellbore tortuosity, bit type, rate of penetration, pump rate) In this research, rheological parameters and parameters of the Herschel-Bulkley rheological model are considered to be optimization inputs to increase hole-cleaning efficiency of commonly used pills in drilling operations. The complete paper offers a detailed discussion of both the importance of flow regime and the role of the Herschel-Bulkley rheological model in reaching a better prognosis of drilling-fluid behavior at low shear rates. The properties of the fibrous hole-cleaning agent used in the complete paper are provided in Table 1. Test Method Two series of tests were performed. The medium of the first series is drilling water, with the goal of evaluating the efficiency of Fiber 1 in fresh pills. The second series of tests was per-formed with a simple polymeric mud as a medium common in drilling operations. Formulations and rheological properties of both test series are provided in Tables 4 and 5 of the complete paper, respectively.

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Satiyawira, Bayu. "EVALUASI HOLE CLEANING SUMUR PANAS BUMI TERHADAP PRODUKSI UAP PADA SUMUR Z DI LAPANGAN S." PETRO 7, no. 3 (2019): 93. http://dx.doi.org/10.25105/petro.v7i3.3815.

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ABSTRAKSumur Z adalah sumur panasbumi dengan fluida produksi berjenis dominan uap (steam dominated) yang telah mulai berproduksi dari Tahun 1988 dengan kapasitas produksi uap sebesar 19 kg/s, seiring berjalannya waktu di awal Tahun 2015 Sumur Z mengalami penurunan produksi menjadi 7 kg/s sehingga kondisi ini menyebabkan Sumur harus ditutup. Dalam usaha untuk memperbaiki Sumur Z diperlukan analisis untuk menemukan terlebih dahulu penyebab terjadinya penurunan produksi dimana hasil analisis ini akan menentukan apakah sumur Z masih bisa diperbaiki atau tidak, karena apabila penyebab penurunan produksi bukan disebabkan oleh lubang sumur maka sumur ini tidak dapat diperbaiki karena pada saat penulisan ini dibuat belum ditemukan metode untuk perbaikan reservoir dominasi uap. Penelitian ini akan menunjukan efektifitas dari hole cleaning bagian dalam sumurterhadap produktifitas Sumur Z. Data-data yang akan dipergunakan diperoleh dari Perusahaan X, berupa data produksi harian dan data pressure-temperature-spinner sebelum serta setelah hole cleaning sumur. Metode yang akan dipergunakan untuk analisis kondisi lubang sumur Zdalah persamaan derivatif uap (Jorge A. Acuna, 2008) yang akan memperlihatkan penyebab dari terjadinya penurunan produksi dan untuk melihat efektivitas dari hole cleaning sumur terhadap penurunan produksi Sumur Z akan dilakukan dengan metode analisis pressure-temperatur-spinner sebelum dan sesudah dilakukan proses hole cleaning sumur yang akan menghasilkan perubahan produksi hasil dari hole cleaning Sumur Z. Hasil dari evaluasi ini akan menunjukan kemampuan analisis dari persamaan derivatif uap dalam penentuan kondisi sumur, dan efektivitas dari hole cleaning sumur pada sumur dengan produksi dominan uap. Hasil hole cleaning sumur pada sumur dengan jenis dominasi uap juga akan berpengaruh pada fluida yang terproduksikan oleh Sumur Z.

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Tatosov, Alexey V., and Artem I. Varavva. "Cleaning the Bottom-Hole Zone of Wells." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 2, no. 3 (2016): 85–93. http://dx.doi.org/10.21684/2411-7978-2016-2-3-85-93.

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Sifferman, T. R., and T. E. Becker. "Hole Cleaning in Full-Scale Inclined Wellbores." SPE Drilling Engineering 7, no. 02 (1992): 115–20. http://dx.doi.org/10.2118/20422-pa.

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Bybee, Karen. "Drilling-Fluids Displacement and Cased-Hole Cleaning." Journal of Petroleum Technology 58, no. 11 (2006): 60–63. http://dx.doi.org/10.2118/1106-0060-jpt.

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Iyoho, A. W., J. M. Horeth II, and R. L. Veenkant. "A Computer Model for Hole-Cleaning Analysis." Journal of Petroleum Technology 40, no. 09 (1988): 1183–92. http://dx.doi.org/10.2118/16694-pa.

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Hemphill, A. T., and Tom Pogue. "Field Applications of ERD Hole Cleaning Modeling." SPE Drilling & Completion 14, no. 04 (1999): 247–53. http://dx.doi.org/10.2118/59731-pa.

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Allawi, Raed H., and Faleh H. M. Almahdawi. "Better Hole Cleaning In Highly Deviated Wellbores." IOP Conference Series: Materials Science and Engineering 579 (August 16, 2019): 012007. http://dx.doi.org/10.1088/1757-899x/579/1/012007.

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Goh, Felicia, Tjin Tjin Tjoa, Kwee Liang Yeo, and Zainab Ismail. "Challenges in Sub-Micron Contact Hole Cleaning." ECS Transactions 11, no. 2 (2019): 267–74. http://dx.doi.org/10.1149/1.2779388.

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Lambin, Anatoliy. "ON THE REGULATION OF HOLE CLEANING MODE." Proceedings of the Siberian Department of the Section of Earth Sciences, Russian Academy of Natural Sciences. Geology, Prospecting and Exploration of Ore Deposits, no. 4 (December 2016): 119–24. http://dx.doi.org/10.21285/0130-108x-2016-57-4-119-124.

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Mohammed, Karrar Ahmed, and Ayad A. Al-Haleem. "Optimization of Hole Cleaning and Cuttings Removal in High Inclined Till Horizontal Well." Iraqi Journal of Chemical and Petroleum Engineering 21, no. 1 (2020): 61–66. http://dx.doi.org/10.31699/ijcpe.2020.1.9.

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The goal of this experimental study is to determine the effects of different parameters (Flow rate, cuttings density, cuttings size, and hole inclination degree) on hole cleaning efficiency. Freshwater was used as a drilling fluid in this experiment. The experiments were conducted by using flow loop consist of approximately 14 m (46 ft) long with transparent glass test section of 3m (9.84 ft.) long with 4 inches (101.6 mm) ID, the inner metal drill pipe with 2 inches (50.8 mm) OD settled with eccentric position positive 0.5. The results obtained from this study show that the hole cleanings efficiency become better with high flow rate (21 m3/hr) and it increase as the hole inclination angles increased from 60 to 90 degree due to dominated of the rolling force. The cuttings size has negative influence on cuttings recovered as size increased and that is true for all cuttings specific gravity due to direct effect of the cuttings size and density on the gravity force which work against lifting force. The increasing of hole inclination angle above 60 degree will affect positively on cuttings removal efficiency.

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Olawale, Samuel Bright, Promise O. Longe, and Samuel Felix Ofesi. "Evaluating the effect of drill string rotation and change in drilling fluid viscosity on hole cleaning." Journal of Petroleum Exploration and Production Technology 11, no. 7 (2021): 2981–89. http://dx.doi.org/10.1007/s13202-021-01209-y.

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AbstractThe most primitive hole challenge is cleaning the hole, which is more severe in deviated wells. This problem was tackled in this research via experimental analysis and graphical evaluations. To hit this aim, rheological parameters were experimentally obtained, and Noah’s model was used to determine cutting bed erosion time at varying heights. A graphical evaluation was done using a case study of deviated wells X and Y from a Niger Delta field. The result shows that low-viscosity fluid, KCL polymer fluid and high-viscosity fluid take 124, 283 and 342 min, respectively, to erode equal height as graphical evaluation shows that hole cleaning will grow complex on deviation. Thus, the deduction from this work in reducing non-productive time (NPT) related to hole cleaning in drilling operation is first, prior to making a trip, pumping low-viscosity fluid at a high flow rate. Secondly, during drilling, increasing drill string rotation in deviated wells can effectively stir the cuttings into the annulus above the low session of the hole.

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Busahmin, Bashir, Nawaf H. Saeid, Ummul Hasanah Binti Hj Hasan, and Gamal Alusta. "Analysis of Hole Cleaning for a Vertical Well." OALib 04, no. 05 (2017): 1–10. http://dx.doi.org/10.4236/oalib.1103579.

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Xiaofeng, Sun. "Review of Hole Cleaning in Complex Structural Wells." Open Petroleum Engineering Journal 6, no. 1 (2013): 25–32. http://dx.doi.org/10.2174/1874834101306010025.

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Pedrosa, Camilo, Arild Saasen, and Jan David Ytrehus. "Fundamentals and Physical Principles for Drilled Cuttings Transport—Cuttings Bed Sedimentation and Erosion." Energies 14, no. 3 (2021): 545. http://dx.doi.org/10.3390/en14030545.

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The increasing necessity of challenging wellbore structures and drilling optimization for improved hole cuttings cleaning has been growing along time. As a result, operator companies have been researching and applying different hole cleaning techniques. Some of these are applied as traditional rules of thumb but are not always suitable for the new and up-coming challenges. This may result in inefficient hole cleaning, non-productive times, pipe stocking and low rate of penetration (ROP), among other problems. Here are presented some results and improvements for hole cleaning optimization obtained by the different research groups. The different authors mainly focus on specific cuttings transport parameters and sometimes combination of some of them. For this reason, there has not been a study that takes into account all of the different factors at the same time to accurately predict the cuttings bed height, formation and erosion, critical fluid velocity and properties and other key parameters. Consequently, there is a lack of understanding about the relation between different factors, such as the cohesiveness of the drilled cuttings with the different interstitial drilling fluids within the cuttings-bed. This relation can be analyzed establishing a wet-granular approach to obtain more efficient cuttings transport mechanism in challenging conditions.

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Ighnatov, A. "Technological characteristics of the device for bore hole cleaning." Mining of Mineral Deposits 10, no. 2 (2016): 85–90. http://dx.doi.org/10.15407/mining10.02.085.

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Li, Jeff, and Scott Walker. "Sensitivity Analysis of Hole Cleaning Parameters in Directional Wells." SPE Journal 6, no. 04 (2001): 356–63. http://dx.doi.org/10.2118/74710-pa.

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Li, Y., and E. Kuru. "Optimization of Hole Cleaning in Vertical Wells Using Foam." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 31, no. 1 (2008): 1–16. http://dx.doi.org/10.1080/15567030802308601.

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Feng, Chao, Jin Liang, Maodong Ren, Gen Qiao, Wang Lu, and Shifan Liu. "A Fast Hole-Filling Method for Triangular Mesh in Additive Repair." Applied Sciences 10, no. 3 (2020): 969. http://dx.doi.org/10.3390/app10030969.

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In the triangular meshes obtained in additive repair, it is a challenge to find one single hole-filling method to close all holes and make the filling patches assort with surrounding meshes well with low time complexity, which is mainly caused by the shape complexity and size difference of the various holes, especially in the fields of intelligent manufacturing, 3D measurement, and reverse engineering. Therefore, it is reasonable to adopt different algorithms to fill different types of holes. In this research, a fast hole-filling method for triangular mesh is proposed based on the hole size. First, a group of basic concepts is defined to make them uniform throughout the whole text, followed by the descriptions of hole detection and boundary cleaning. Second, three different algorithms are developed to fill the small-sized, middle-sized, and large-sized holes classified by hole size respectively, which can fill all the detected holes in a fast and proper manner. Finally, two experiments are carried out to verify the efficiency, robustness, and ability to recover the shape of our method. Compared to two state-of-the-art hole-filling methods in the first experiment, the quantitative evaluation results demonstrate that our proposed method is much faster than them with the ability to guarantee the regularity of most filling triangles. The second experiment proves that our method can produce satisfactory filling results by making the filling patches be compatible with surrounding meshes well.

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AlQattan, Jawad, Youngjin Kim, Sarah Kerdi, Adnan Qamar, and Noreddine Ghaffour. "Hole-Type Spacers for More Stable Shale Gas-Produced Water Treatment by Forward Osmosis." Membranes 11, no. 1 (2021): 34. http://dx.doi.org/10.3390/membranes11010034.

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An appropriate spacer design helps in minimizing membrane fouling which remains the major obstacle in forward osmosis (FO) systems. In the present study, the performance of a hole-type spacer (having holes at the filament intersections) was evaluated in a FO system and compared to a standard spacer design (without holes). The hole-type spacer exhibited slightly higher water flux and reverse solute flux (RSF) when Milli-Q water was used as feed solution and varied sodium chloride concentrations as draw solution. During shale gas produced water treatment, a severe flux decline was observed for both spacer designs due to the formation of barium sulfate scaling. SEM imaging revealed that the high shear force induced by the creation of holes led to the formation of scales on the entire membrane surface, causing a slightly higher flux decline than the standard spacer. Simultaneously, the presence of holes aided to mitigate the accumulation of foulants on spacer surface, resulting in no increase in pressure drop. Furthermore, a full cleaning efficiency was achieved by hole-type spacer attributed to the micro-jets effect induced by the holes, which aided to destroy the foulants and then sweep them away from the membrane surface.

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Wang, Yufei, Jie Wang, Hongwei Zhang, Yi Wu, and Anhu Dang. "Numerical and experimental investigation to determine the optimal configuration of an aeration component in the hollow fiber membrane cleaning process." RSC Advances 6, no. 26 (2016): 21600–21611. http://dx.doi.org/10.1039/c5ra24544c.

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Wada, Masayuki, H. Takahashi, James Snow, et al. "Cleaning and Surface Preparation for SiGe and Ge Channel Device." Solid State Phenomena 187 (April 2012): 19–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.187.19.

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Since silicon will ultimately face physical limitations, germanium and III-V materials, such as Ga, GaAs, InGaAs, are being extensively investigated for their high electron and hole mobility advantages. Prior to implementing germanium or III-V materials, it is believed that SiGe with high Ge concentration will be applied for channel materials in pMOS devices with high-k and metal gates in order to simultaneously adjust the work function and to increase the hole mobility. However, introduction of new channel materials leads to new challenges and substantial changes in the FEOL process flow.

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Qu, Jingyu, Tie Yan, Xiaofeng Sun, Zijian Li, and Wei Li. "Numerical Simulation of the Effects of the Helical Angle on the Decaying Swirl Flow of the Hole Cleaning Device." Processes 7, no. 2 (2019): 109. http://dx.doi.org/10.3390/pr7020109.

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The application of the hole cleaning device in downhole is a new technology that can improve the problem of cuttings accumulation in the annulus and improve the hole cleaning effect of the wellbore during drilling. In this paper, the Reynolds Averaged Navier–Stokes model, together with the Realizable k-ε turbulence model, are used to perform transient simulations. The effects of rotational speed, blade shape, and helical angle on the initial swirl intensity and its decay behavior along the flow direction are studied. The swirl number, the initial swirl intensity, the decay rate, the tangential velocity distribution, and the variation of pressure are analyzed. The results indicate that the swirl number of the swirl flow exponentially decays along the flow direction. The straight blade and V-shaped blade have different swirl flow induction mechanisms. Under specific drilling parameters, the critical helical angle is determined for both types of blades. When the selection of the helical angle is close to the critical value, the swirl flow will be close to the axial flow, which is of little help in hole cleaning. Moreover, the rotation direction of swirl flow will change when the helical angle exceeds the critical value.

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Ihekoronye, K. K., N. C. Izuwa, N. U. Okereke, S. T. Ekwueme, and R. C. Amaefula. "Evaluating the rheological property of Irvingia gabonensis and Abelmoschus esculentus as a substitute to conventional Pac-R on cutting carrying capacity and hole cleaning." Journal of Petroleum Exploration and Production Technology 10, no. 3 (2019): 1069–79. http://dx.doi.org/10.1007/s13202-019-00798-z.

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Abstract In this work, experiment was carried out resulting in the utilization of local viscosifiers as substitute to conventional method (PAC-R) for hole cleaning purposes in drilling mud. The proposed viscosifiers are Irvingia gabonensis (Ogbono) and Abelmoschus esculentus (Okro) as alternative to the imported poly-anionic cellulose-regular (PAC-R) which is used in cutting carrying capacity efficiency. Laboratory tests were carried out on the proposed viscosifiers to evaluate their rheological properties. Slip velocity, annular velocity, shear stress, shear rate and cuttings transport efficiency on hole cleaning parameters were calculated to ascertain the effectiveness of the proposed viscosifiers in comparison with the conventional one (PAC-R). The results of the study showed that the proposed viscosifiers Sample B Irvingia gabonensis (Ogbono) had cutting carrying capacity of 96% for 5, 8, 10 and 15 (g), respectively. However, Sample C Abelmoschus esculentus (Okro) had 96% for 5 g and 8 g and 95% for 10 g and 15 g on the cutting transport efficiency. Based on the result of this work, the proposed viscosifiers compared favorably to that of PAC-R on hole cleaning and cutting carrying capacity.

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Zhou, Lei. "Hole Cleaning During Underbalanced Drilling in Horizontal and Inclined Wellbore." SPE Drilling & Completion 23, no. 03 (2008): 267–73. http://dx.doi.org/10.2118/98926-pa.

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Feder, Judy. "Comprehensive Cuttings-Transport Model Optimizes Drilling Operations for Hole Cleaning." Journal of Petroleum Technology 72, no. 11 (2020): 57–58. http://dx.doi.org/10.2118/1120-0057-jpt.

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Wilson, Adam. "Innovative Tool Improves Hole-Cleaning Efficiency in Extended-Reach Wells." Journal of Petroleum Technology 68, no. 05 (2016): 80–82. http://dx.doi.org/10.2118/0516-0080-jpt.

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Kenny, Patrick. "Hole-Cleaning Capabilities of an Ester-Based Drilling Fluid System." SPE Drilling & Completion 11, no. 01 (1996): 3–10. http://dx.doi.org/10.2118/28308-pa.

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Chen, Zheng Mao, Hong Lin Xu, and Ji You Xiong. "Numerical Computation Studies and Hydrodynamic Analysis on the Cutting-Carrying and Lifting Capacity of Spiral Centralizer in Gas Drilling." Applied Mechanics and Materials 345 (August 2013): 325–30. http://dx.doi.org/10.4028/www.scientific.net/amm.345.325.

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For gas drilling, hole cleaning is a particularly critical problem. When the spiral centralizer is used in the down hole assembly of gas drilling, it will produce a powerful rotational flow which will be bond to have the influence of different level on the hole cleaning. For this matter, this paper has established a three-dimensional fluid dynamics model in the basis of gas-solid two-phase turbulent theory and got its numerical solution by using the finite volume method, therefore making a quantitative evaluation about the ability of cutting-carrying and lifting of the spiral centralizer. The results have shown that the spiral centralizer has the function of cutting-carrying and lifting; part of the rock debris pellet concentrates in the bottom of the blade, above less instead. The numerical calculation method has some guiding significance for spiral centralizer design in gas drilling.

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Zekentes, Konstantinos, I. Zergioti, A. Klini, and George Konstantinidis. "Via Hole Formation in Silicon Carbide by Laser Micromachining." Materials Science Forum 527-529 (October 2006): 1119–22. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.1119.

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A 248 nm (KrF) excimer laser with a repetition rate of 10 Hz, pulse duration of 30 ns and beam energy up to 450 mJ was employed to form vias in 4H-SiC substrates and Lely platelets. SEM micrographs have been used to evaluate etched material quality as well as etch rate. The area surrounding the via-holes is covered by nanoparticles, which are debris from the laser ablation and are removed by chemical cleaning and agitation. The etch-rate exhibits a perfect linear behaviour versus the number of laser pulses showing the possibility of an all-laser via-hole formation. A slight tapering along the via-holes, useful for the subsequent metallization process is also observed. Finally, a defective,15 μm wide, zone is formed nearby the sidewalls.

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Zhao, Wanqin, Haodong Liu, Xiaowei Shen, Lingzhi Wang, and Xuesong Mei. "Percussion Drilling Hole in Cu, Al, Ti and Ni Alloys Using Ultra-Short Pulsed Laser Ablation." Materials 13, no. 1 (2019): 31. http://dx.doi.org/10.3390/ma13010031.

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Comparative study on micro-deep hole drilling by picosecond ultra-short pulse laser in four metals, including copper, aluminum alloy, titanium alloy, and nickel alloy, was presented. Destructive testing was performed to measure the depth, shape, and side-wall morphology of micro-deep holes in this study. Diameters and depths of micro-deep holes in four metals ablated using the same processing parameters were compared. The multiple thresholds of metals had been calculated. Relationships between hole dimensions and multiple thresholds (the average ablation threshold, the ablation threshold and the thermal threshold) and physical properties (for example, the heat capacity, the melting temperature, the optical penetration depth and the absorbance, etc.) of the four metals are examined. Furthermore, the surface and side-wall morphologies of the micro-deep holes in four metals were demonstrated. The influence mechanisms, especially the side-wall morphology, were discussed, such as the thresholds, conical emission, self-cleaning effect, physical properties of metals, the energy transmission, the plasma effect, thermochemical reaction, and so on.

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Глущенко, Андрей, Andrey Gluschenko, Денис Молочников, et al. "TO THE QUESTION OF CLEANING OF EXHAUST OIL FROM NON-SOLUBLE IMPURITIES IN A HYDROCYCLONE." Vestnik of Kazan State Agrarian University 13, no. 3 (2018): 77–80. http://dx.doi.org/10.12737/article_5bcf57ae82ff79.43634303.

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The possibility of using hydrocyclone plants for cleaning used oils is considered. The dependence of the degree of purification of waste oil on insoluble impurities is determined theoretically, determined by the mass content of particles in the oil flow removed through the lower drainage hole, from the time of the particle in the hydrocyclone and the radius of the surface of zero axial velocity, which determines the separation of the oil flow and the entrainment of particles through the upper or lower discharge holes.

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Ford, J. T., Erhu Goo, M. B. Oyeneyin, J. M. Peden, M. B. Larrucia, and David Parker. "A New MTV Computer Package for Hole-Cleaning Design and Analysis." SPE Drilling & Completion 11, no. 03 (1996): 168–72. http://dx.doi.org/10.2118/26217-pa.

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Ozbayoglu, E. M. M., R. E. E. Osgouei, A. M. M. Ozbayoglu, and E. Yuksel. "Hole-Cleaning Performance of Gasified Drilling Fluids in Horizontal Well Sections." SPE Journal 17, no. 03 (2012): 912–23. http://dx.doi.org/10.2118/131378-pa.

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Summary This study aims to investigate the hole-cleaning process during the flow of a drilling fluid consisting of a gas and a liquid phase through a horizontal annulus. Experiments have been conducted using the Middle East Technical University (METU) multiphase flow loop under a wide range of air- and water-flow rates while introducing cuttings into the annulus for different amounts. Data have been collected for steady-state conditions (i.e., liquid, gas, and cuttings injection rates are stabilized). Collected data include flow rates of liquid and gas phases, frictional pressure drop inside the test section, local pressures at different locations in the flow loop, and high-speed digital images for identification of solid, liquid, and gas distribution inside the wellbore. Digital imageprocessing techniques are applied on the recorded images for volumetric phase distribution inside the test section, which are in dynamic condition. The effects of liquid and gas phases are investigated on cuttings-transport behavior under different flow conditions. Observations showed that the major contribution for carrying the cuttings along the wellbore is the liquid phase. However, as the gas-flow rate is increased, the flow area left for the liquid phase dramatically decreases, which leads to an increase in the local velocity of the liquid phase causing the cuttings to be dragged and moved, or a significant erosion on the cuttings bed. Therefore, increase in the flow rate of gas phase causes an improvement in the cuttings transport although the liquid-phase flow rate is kept constant. On the basis of the experimental observations, a mechanistic model that estimates the total cuttings concentration and frictional pressure loss inside the wellbore is introduced for gasified fluids flowing through a horizontal annulus. The model estimations are in good agreement with the measurements obtained from the experiments. By using the model, minimum liquid- and gas-flow rates can be identified for having an acceptable cuttings concentration inside the wellbore as well as a preferably low frictional pressure drop. Thus, the information obtained from this study is applicable to any underbalanced drilling operation conducted with gas/liquid mixtures, for optimization of flow rates for liquid and gas phases to transport the cuttings in the horizontal sections in an effective way with a reasonably low frictional pressure loss.

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Yan, Tie, Kelin Wang, Xiaofeng Sun, and Shizhu Luan. "State-of-the-Art Hole-Cleaning Techniques in Complex Structure Wells." Recent Patents on Engineering 8, no. 1 (2014): 50–57. http://dx.doi.org/10.2174/1872212108666140225002950.

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Sanchez, R. Alfredo, J. J. Azar, A. A. Bassal, and A. L. Martins. "Effect of Drillpipe Rotation on Hole Cleaning During Directional-Well Drilling." SPE Journal 4, no. 02 (1999): 101–8. http://dx.doi.org/10.2118/56406-pa.

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Bornstein, Myer S. "Instrument cleaning services: A patch or another hole in the bucket?" Fertility and Sterility 68, no. 3 (1997): 566. http://dx.doi.org/10.1016/s0015-0282(97)90191-6.

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Antonets, I. V., and S. M. Bondar’. "Device for cleaning a conical hole in a machine-tool spindle." Russian Engineering Research 33, no. 11 (2013): 670–71. http://dx.doi.org/10.3103/s1068798x13110051.

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40

Xiaofeng, Sun. "Cuttings Transport Behavior and Simulation Analysis Affected by Hole Cleaning Tool." Open Petroleum Engineering Journal 6, no. 1 (2013): 64–68. http://dx.doi.org/10.2174/1874834101306010064.

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41

Rodríguez, H. H., O. M. Hernández, E. R. Acevedo, D. C. Velázquez, A. N. Conejo, and R. D. Morales. "A New Hole Cleaning Criteria for Drilling Operations of Oil Wells." Petroleum Science and Technology 21, no. 5-6 (2003): 839–61. http://dx.doi.org/10.1081/lft-120017453.

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42

Zhang, Feifei, Stefan Miska, Mengjiao Yu, Evren Ozbayoglu, and Nicholas Takach. "A Fast Graphic Approach To Estimate Hole Cleaning for Directional Drilling." SPE Drilling & Completion 32, no. 01 (2017): 51–58. http://dx.doi.org/10.2118/173681-pa.

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43

Yeu, Wong Jenn, Allan Katende, Farad Sagala, and Issham Ismail. "Improving hole cleaning using low density polyethylene beads at different mud circulation rates in different hole angles." Journal of Natural Gas Science and Engineering 61 (January 2019): 333–43. http://dx.doi.org/10.1016/j.jngse.2018.11.012.

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44

Fang, Qin, Dong Liangliang, Tang Shiguo, et al. "Analysis and application of cleaning tool structure in negative pressure reverse circulating wellbore." Advances in Mechanical Engineering 12, no. 8 (2020): 168781402093859. http://dx.doi.org/10.1177/1687814020938596.

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Sediments frequently appear at the bottom of oil and gas wells in the bottom of carbonate rocks during completion or production, seriously affecting the productivity. In order to solve the wellbore cleaning problem, this article applies the Bernoulli equation theory method, the finite element method based on the standard turbulence model and the laboratory test to verify a kind of negative pressure wellbore cleaning tool which can establish local reverse circulation under the action of high-pressure water jet and salvage the bottom debris. Through the numerical analysis of the cleaning tool structure, it is found that the wall face diameter is at least two times of the nozzle hole diameter to effectively play the cleaning tool performance. If the total area of nozzle outlet is 48π mm2, the cleaning tool fishing capacity of six nozzle structures is improved the most. The analysis of the adaptability of the cleaning tool shows that the cleaning tool with an outer diameter of 104 mm is most suitable for the casing shaft with an inner diameter of 127.3 mm. The cleaning tool was applied to the field operation and successfully cleaned the wellbore, effectively increasing the wellbore productivity.

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45

Koklu, Ugur, Sezer Morkavuk, Carol Featherston, et al. "The effect of cryogenic machining of S2 glass fibre composite on the hole form and dimensional tolerances." International Journal of Advanced Manufacturing Technology 115, no. 1-2 (2021): 125–40. http://dx.doi.org/10.1007/s00170-021-07150-y.

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AbstractS2 glass fibre reinforced epoxy composites are widely used in aeronautical applications owing to their excellent strength to weight ratio. Drilling glass fibres can be cumbersome due to their abrasive nature and poor thermal conductivity. Moreover, the use of conventional coolants is not desirable due to contamination and additional costs for cleaning the machine part. An alternative is to use environmentally friendly coolants such as liquid nitrogen (LN2) which have been previously employed in machining metals and composites. The current study investigates the effect of drilling S2 glass fibre composite in a bath of LN2. The study aims to evaluate the effect of spindle speed, feed rate and the presence of cryogenic cooling on the form and dimensional tolerances of the hole (hole size, circularity, cylindricity and perpendicularity). Design of experiments and analysis of variance (ANOVA) were used to determine the contribution of the input parameters on the analysed hole quality metrics. Results indicated that drilling S2 glass fibre in a cryogenic bath increased hole size significantly beyond the nominal hole diameter. The hole circularity and cylindricity were reduced compared to holes drilled under dry condition under all cutting parameters due to enhanced thermal stability during the drilling process. The current study aims to provide the scientific and industrial communities with the necessary knowledge on whether cryogenic bath cooling strategy provides better hole quality output compared to dry drilling and other cryogenic cooling strategies which were previously reported in the open literature.

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46

Guo, Xiao Le, Zhi Ming Wang, and Zhi Hui Long. "Hydraulics Analysis System for Extended Reach Drilling in China and its Application." Applied Mechanics and Materials 241-244 (December 2012): 1349–53. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1349.

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The extended reach drilling (ERD) is being adopted widely as an effective and economical way of developing oilfields in China. But it also brought a series of technical difficulties because of its own characteristics. Some progresses were made after several years of hard work in China about Hydraulics for extended reach drilling, which included cuttings transport models and rules, precise model of circulating system pressure loss calculation, hole cleaning calculating models and monitoring method, hydraulic extended limit calculation model and analysis, hydraulics design and optimization method for ERD. Based on the above studies, the author finally developed a system of hole cleaning monitoring and hydraulics design and its risk analysis which could provide theoretical support and useful tool for engineering design and risk assess before drilling. These researches are helpful to ERD and have enriched the hydraulic theory of ERD.

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47

Rehman, Syed Raza, Alap Ali Zahid, Anwarul Hasan, Ibrahim Hassan, Mohammad A. Rahman, and Sayeed Rushd. "Experimental Investigation of Volume Fraction in an Annulus Using Electrical Resistance Tomography." SPE Journal 24, no. 05 (2019): 1947–56. http://dx.doi.org/10.2118/194211-pa.

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Summary Horizontal drilling technology has shown to improve the production and cost–effectiveness of the well by generating multiple extraction points from a single vertical well. The efficiency of hole cleaning is reduced because of the solid–cuttings accumulation in the annulus in cases of extended–reach drilling. It is difficult to study the complex flow behavior in a drilling annulus using the existing visualization techniques. In this study, experiments were carried out in the multiphase flow–loop system consisting of a simulated drilling annulus using electrical resistance tomography (ERT) and a high–speed camera. Real–time tomographic images (quantitative visualization) of multiphase flow from ERT were compared to the actual photographs of the flow conditions in a drilling annulus. The quantitative analysis demonstrates that ERT has a wide potential application in studying the hole–cleaning issues in the drilling industry.

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Mohammed, Sahmi E., and Faleh H. M. Almahdawi. "Experimental Study for Assessment of Cutting Density Effect on Hole Cleaning Efficiency in Inclined and Horizontal Wells." Iraqi Journal of Chemical and Petroleum Engineering 21, no. 3 (2020): 1–8. http://dx.doi.org/10.31699/ijcpe.2020.3.1.

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The poor hole cleaning efficiency could causes many problems such as high torque, drag, poor hydraulics and pipe stuck. These inherent problems result in an avoidable high operation cost which this study tried to address. In this study, the effect of cutting density on hole cleaning efficiency in deviated and horizontal wells was investigated. Experiments were conducted using 40 feet (12 m) long of flow loop made from iron and PVC. However, the test section was made from PVC with (5.1m) long and (4” ID) for outer pipe and (2” OD) inner pipe. The cutting transport ratio (CTR) was determined from weight measurements for each test. Cutting Transport Ratio has been investigated for effects of the following parameters; flow rate, cutting size and density, yield point of drilling mud, and inclination angle. Once the setup was positioned at the desired inclination, the cutting was transported for 3 minutes at a constant flow rate and yield point. The amount of cutting removed during each test was thereafter weighted to determine cutting transport ratio CTR. The results obtained from this study showed that the cutting density has a slight to moderate effect on hole cleaning efficiency. Also, there was a remarkable improvement in the cutting transport ratio annular velocity and hole inclination angle was increased. However, the yield point (Yp) was negligible at maximum values of annular velocity. Therefore, at high value of yield point the cuttings with large and medium size were transported more than small size. This case is inversed at a low value of Yp. Moreover, for all sizes the heavy cutting transport less than light cutting. Finally, the critical angle was recorded between 65o-75o. Sigma plot 12.5 program has been used to graph all figures in this paper.

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Lake, B. D., and V. Santostefano. "BASS STRAIT DRILLING - PREPARING FOR THE NINETIES." APPEA Journal 30, no. 1 (1990): 300. http://dx.doi.org/10.1071/aj89019.

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Future development drilling in Bass Strait will be challenged by small field sizes, thin oil columns and increasing drilling difficulty due to greater hole angle and reach. New drilling technology successfully introduced in the recent Bream, Whiting, Perch and Dolphin developments including Steerable Drilling Systems (SDS), Polycrystalline Diamond Compact (PDC) bits and Logging While Drilling (LWD) tools, coupled with the successful use of jackup rigs for miniplatform development, has given Esso the tools and confidence to meet the development challenges of the 'nineties. Bass Strait's first horizontal well has been successfully drilled and completed with further wells planned in the current Bream development. There still remain some areas requiring improvements, including hole cleaning in high angle holes. Improvements in this and other areas will further improve drilling capability.Given the right incentives Bass Strait drilling technology is well positioned for the challenge of oil development in the 'nineties.

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Ozbayoglu, M. E., M. Sorgun, A. Saasen, and K. Svanes. "Hole Cleaning Performance of Light-Weight Drilling Fluids During Horizontal Underbalanced Drilling." Journal of Canadian Petroleum Technology 49, no. 04 (2010): 21–26. http://dx.doi.org/10.2118/136689-pa.

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Journal articles on the topic 'Hole cleaning'

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