Journal articles: 'Safe drilling'

1

Bybee, Karen. "Changing the Safe Drilling Window With Invert Emulsion Drilling Fluids." Journal of Petroleum Technology 62, no. 11 (November 1, 2010): 67–69. http://dx.doi.org/10.2118/1110-0067-jpt.

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Boiadjiev, George, Rumen Kastelov, Tony Boiadjiev, Kamen Delchev, and Kazimir Zagurski. "Automatic Bone Drilling – More Precise, Reliable and Safe Manipulation in the Orthopaedic Surgery." Journal of Theoretical and Applied Mechanics 46, no. 2 (June 1, 2016): 51–64. http://dx.doi.org/10.1515/jtam-2016-0010.

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Abstract Bone drilling manipulation often occurs in the orthopaedic surgery. By statistics, nowadays, about one million people only in Europe need such an operation every year, where bone implants are inserted. Almost always, the drilling is performed handily, which cannot avoid the subjective factor influence. The question of subjective factor reduction has its answer - automatic bone drilling. The specific features and problems of orthopaedic drilling manipulation are considered in this work. The automatic drilling is presented according the possibilities of robotized system Orthopaedic Drilling Robot (ODRO) for assuring the manipulation accuracy, precision, reliability and safety.

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Gao, Fei, Xiong Hu Zhao, Hong Shan Liu, Zhi Kun Liu, and Jun Zheng Yang. "The Study of Drilling Safe Monitoring System Based on Multi Agent Group." Advanced Materials Research 512-515 (May 2012): 2565–69. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2565.

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Lots of complexity and uncertainties are existed in drilling process. Further more, one of the possible ways to solve on-site drilling safety accidents is the early-warning through real-time monitoring. Based on the analysis of main hazards during drilling process, considering that most of the hazards are observable and controllable, by using multi agent group (MAG) technology of distributed artificial intelligence (DAI), this paper puts forward a functional schematic model with drilling hazards monitoring multi agent group, which includes real-time monitoring agent, feature extraction agent warning analysis agent, communication agent and user interaction agent. Considering the features of drilling engineering hazard monitoring, a distributed drilling safety monitoring system including the two levels, site-level and base-level, is built.

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Denney, Dennis. "Safe Drillpipe Connections During Managed-Pressure-Drilling Operations." Journal of Petroleum Technology 64, no. 06 (June 1, 2012): 105–9. http://dx.doi.org/10.2118/0612-0105-jpt.

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Lammens, J., B. Vanermen, and G. Fabry. "Safe pin-drilling in Ilizarov's percutaneous transfixation method." Journal of Bone and Joint Surgery. British volume 73-B, no. 5 (September 1991): 865. http://dx.doi.org/10.1302/0301-620x.73b5.1894684.

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Wang, Nan Nan, Yong Ping Wang, Dong Zhang, and Hui Min Tang. "Micro Foam Drilling Fluid System Performance Research and Application." Advanced Materials Research 868 (December 2013): 601–5. http://dx.doi.org/10.4028/www.scientific.net/amr.868.601.

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Micro foam drilling fluid has irreplaceable advantages in reservoir protection, drilling speed, improve the cementing quality and leak plugging, especially suitable for the "three low" Daqing peripheral oilfield Haita area. Indoor the foaming agent, foam stabilizing agent were screened, Preferably choose the efficient composite foaming agent, stabilizer and thickener, the drilling fluid system is transformed into micro foam drilling fluid system. And evaluate the inhibition, anti temperature, anti pollution (anti clay, calcium, anti kerosene) reservoir protection capability, The micro foam drilling fluid leakage, oil reservoir protection, speed up mechanism and micro foam drilling fluid rheological characteristics were studied, Set up a specific rheological model of Micro Foam Drilling fluid, According to the characteristics of Gulong oilfield,R&D the calculation software of Micro Foam drilling fluid density changes with the temperature, pressure and provide guidance for safe drilling. Field application shows that the system has the advantages of simple preparation,convenient maintenance, easy transformation, drilling fluid properties can meet the requirements of drilling technology, To ensure the safe, fast, and high quality drilling of oil and gas,reduce pollution,improve the productivity of a single well.

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7

Gudoshnik, E., E. Ibragimov, and K. Eremenko. "Safe Drilling Simultaneous Operation for Hydraulic Fracturing of Formation and Drilling on Multiple Well Platform." Bulletin of Science and Practice 6, no. 7 (July 15, 2020): 235–42. http://dx.doi.org/10.33619/2414-2948/56/24.

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The article discusses the specifics of conducting simultaneous hydraulic fracturing and drilling on a well pad. Describes the actions before starting work. Features of drilling and construction of wells. The causes of accidents and methods for preventing accidents and indicators during hydraulic fracturing and drilling are determined. Safety enhancements are proposed while carrying out work.

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Li, Yu Wei, Jia Liu, Chao Yang Hu, Shuang Li, and Yu Liu. "Effect of Pore Pressure Variation on Borehole Stability of Drilling in Sandstone Reservoir." Advanced Materials Research 577 (October 2012): 163–66. http://dx.doi.org/10.4028/www.scientific.net/amr.577.163.

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Considering pore pressure variation of sidewall rock, which is caused by drilling fluid filtering, the porosity variation model of sidewall rock in sandstone reservoir and effective stress factor variation model are established, and according to relationship between pore pressure and total volume strain of sandstone, the calculation model of safe window of drilling fluid density on sandstone reservoir, with which considered variation of porosity and effective stress factor are finally established. Applying the calculation of this model shows that: with increased function of drilling fluid filtering, which is as increased as pore pressure of sidewall rock, caving pressure that ensures well hole stability is increased, fracturing pressure is decreased, safe window of drilling fluid is narrowing, and that is against of safety drilling.

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Hou, Bing, Mian Chen, Ming Liu, and Qiquan Xiong. "Safe Disposal Technology of Waste Oil-based Drilling Fluids." Journal of the Japan Petroleum Institute 56, no. 4 (2013): 221–29. http://dx.doi.org/10.1627/jpi.56.221.

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10

Gaevaya, E. V., S. S. Tarasova, and E. V. Zaharova. "Ways of Drilling Wastes Utilization Using Ecologically Safe Materials." IOP Conference Series: Earth and Environmental Science 272 (June 21, 2019): 032054. http://dx.doi.org/10.1088/1755-1315/272/3/032054.

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11

Tachibana, R., M. Motoyoshi, A. Shinohara, T. Shigeeda, and N. Shimizu. "Safe placement techniques for self-drilling orthodontic mini-implants." International Journal of Oral and Maxillofacial Surgery 41, no. 11 (November 2012): 1439–44. http://dx.doi.org/10.1016/j.ijom.2012.05.031.

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12

Xie, Haibo, Zhengjiang Liu, Xingkang Xu, and Jiping Zhang. "Research on the safe distance between passing ship and offshore drilling platform based on theory and statistics." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 3 (March 4, 2020): 642–50. http://dx.doi.org/10.1177/1475090220902305.

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The offshore drilling platform is the main equipment for oil and gas exploration. The increase in offshore drilling platform results in the apparently increased contradiction between oilfield exploitation and safe navigation of ships. In order to ensure safe navigation and the normal exploitation of oil and gas fields in a limited space, it is necessary to quantify the distance between ships and coastal drilling platforms. In this investigation, the relevant theoretical calculation models were developed, including a drift model for ship out of control and a ship emergency stopping model. By selecting appropriate ship samples, theoretical safe distances under different models can be obtained. With the use of statistical correlation theory based on the Automatic Identification System data of ship, the safe distance between passing ship and platform was further studied. Finally, the recommended safe distance in different waters was summarized by comparing different model calculation results and data statistics results. Research results are beneficial for the safety of ship navigation, safe operation of the platform, and the revision of relevant standards.

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13

Chang, Cheng, Gang Luo, Mingwen Wang, and Yunqiang Sun. "Near-salt perturbations of stresses and pore fluid pressures and their impacts on wellbore stability in the Kuqa depression of the Tarim Basin, China." Interpretation 8, no. 2 (May 1, 2020): SG33—SG49. http://dx.doi.org/10.1190/int-2019-0168.1.

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Salt structures are highly associated with economic hydrocarbon reservoirs. However, drilling a wellbore near or through the salt is usually difficult because the near-salt stresses and pore fluid pressures are largely perturbed due to weaker mechanical strength of salt bodies than their surrounding sediments. We have developed a 2D plane-strain poroelastic finite-element model to simulate stresses and pore pressures in the horizontal-compression salt tectonic system, the Kuqa depression in the Tarim Basin, China, and we use the model results of stresses and pore pressures to calculate safe drilling mud weights on drilling in the salt basin. We found that in early stage of the transient process (close to the undrained condition), pore fluid overpressure occurs at salt convex due to additional compression, whereas underpressure occurs at salt concave due to additional extension within the minibasin. Horizontal effective stress decreases at salt concave (within the minibasin) but increases at salt convex; vertical effective stress varies oppositely to horizontal effective stress. In the final stage of the transient process (drained condition), overpressure has dissipated and pore pressure remains hydrostatic, and stress perturbations are similar to those from the static geomechanical model with elastic sediments: horizontal stress increases at salt convex but decreases at salt concave; vertical stress slightly increases at salt convex and concave. Our calculated safe drilling mud weights and their windows vary over time. Especially at the salt convex, the safe windows are relatively narrow in the early stage of the transient process but become wider in later stage because overpressure dissipates over time and this makes drilling easier. Our results indicate different perturbation patterns of stresses and pore pressures near different salt geometries in a horizontal-compression salt tectonic system, and provide insights into wellbore drilling design and safe drilling mud weights in the salt system.

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Tan, Song Cheng, Long Chen Duan, Song E. Tan, and Hao Shi. "Study on Critical Drilling Parameters for Auger Drilling." Advanced Materials Research 243-249 (May 2011): 3331–40. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3331.

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Auger drilling is widely employed in pile foundation engineering and sampling test for geological sciences, and is even considered as one of the idealest methods for space sampling. However, in practice, drilling parameters are usually determined by experience which might cause unnecessary accidents as a result of transportation blocking of chips. To achieve smooth chips transportation, the existed critical speed models are firstly analyzed and summarized in this paper followed by the main introduction of the proposed new model of critical drilling parameters. The influence of rotational speed and vertical feeding rate on the actual trajectory of chips transportation as well as the selection of critical models for different applied drilling fields are subsequently investigated and discussed herein. Analyses indicate that the critical models of overall combined chips and chips divided into inner and outer layer are more reliable, vertical feeding rate and rotational speed should be taken into account simultaneously. The analyses on the actual trajectory of chips transportation are helpful to understand the motion state of chips. To achieve safe and efficient drilling production, suggested drilling parameters should be provided by manufacturers according to the solving models mentioned in this paper and the specific drilling fields.

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15

Wu, Hui Mei, Yi Shan Lou, Zhong Hui Li, Liang Zhu, and Wan Long Huang. "Wellbore Stability Research to the Direction Well in the Salt Layer." Advanced Materials Research 250-253 (May 2011): 4042–45. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.4042.

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The creep of salt layer often leads to tight hole and pipe sticking, while the deviation angle has an important impact on creep rate when drilling directional wells in salt layer. This paper firstly built the creep constitutive model according to the creep property of salt layers, and defined the creep parameters by field data and log data; then built geomechanics model and applied FLAC3Dsoftware to simulate the creep of salt layer, so the safe mud density window drilling the salt layers smoothly is obtained. at the same time, at last analyzed the effect of the deviation angle to the drilling in the salt layer, The conclusion is that when the overburden pressure is major principal stress, drilling mud density is certain, the creep rate increases with the increasing of the deviation angle, the safe mud density also increased, the high deviation angle directional well in salt layers is much more risky. The conclude makes great contribution to the optimizing deviation angle, designing well track and reducing the drilling troubles when drilling directional wells in the salt layer.

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16

Mu, Yun Long, Lei Wang, Ke Ming Liu, Jin Gen Deng, Bao Hua Yu, and Yuan Cao. "Wellbore Stability of Salt and Anhydrite Formation of Fauqi Oilfield in Iraq." Applied Mechanics and Materials 641-642 (September 2014): 462–68. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.462.

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Salt and anhydrite formation of Fauqi oilfield in Iraq contains salt, anhydrite and shale. Complex situations have occurred in drilling process, such as overflow and sticking. The cores of the three lithology rock are fetched and their strength and creep mechanical properties are tested. Anhydrite is with higher strength and lower creep properties, and shale and salt is with lower strength and higher creep properties. The collapse pressure and fracture pressure of the three lithology rock are calculated. The safe density window of anhydrite is the most widest and there is no risk of wellbore instability, and the safe density window of shale is the narrowest and wellbore instability easily occur. The low limit of mud density to prevent shale and salt creep are calculated by power law model. The safe drilling density window is determined and successfully applied in drilling field.

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17

Ma, Tianshou, Tao Tang, Ping Chen, and Chunhe Yang. "Uncertainty Evaluation of Safe Mud Weight Window Utilizing the Reliability Assessment Method." Energies 12, no. 5 (March 12, 2019): 942. http://dx.doi.org/10.3390/en12050942.

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Due to the uncertainty of formation properties and improper wellbore stability analysis methods, the input parameters are often uncertain and the required mud weight to prevent wellbore collapse is too large, which might cause an incorrect result. However, the uncertainty evaluation of input parameters and their influence on safe mud weight window (SMWW) is seldom investigated. Therefore, the present paper aims to propose an uncertain evaluation method to evaluate the uncertainty of SMWW. The reliability assessment theory was introduced, and the uncertain SMWW model was proposed by involving the tolerable breakout, the Mogi-Coulomb (MG-C) criterion and the reliability assessment theory. The influence of uncertain parameters on wellbore collapse, wellbore fracture and SMWW were systematically simulated and investigated by utilizing Monte Carlo simulation. Finally, the field observation of well SC-101X was reported and discussed. The results indicated that the MG-C criterion and tolerable breakout is recommended for wellbore stability analysis. The higher the coefficient of variance is, the higher the level of uncertainty is, the larger the impact on SMWW will be, and the higher the risk of well kick, wellbore collapse and fracture will be. The uncertainty of basic parameters has a very significant impact on SMWW, and it cannot be ignored. For well SC-101X, the SMWW predicted by analytical solution is 0.9921–1.6020 g/cm3, compared to the SMWW estimated by the reliability assessment method, the reliability assessment method tends to give a very narrow SMWW of 1.0756–1.0935 g/cm3 and its probability is only 80%, and the field observation for well kick and wellbore fracture verified the analysis results. For narrow SMWW formation drilling, some kinds of advanced technology, such as the underbalanced drilling (UBD), managed pressure drilling (MPD), micro-flow drilling (MFD) and wider the SMWW, can be utilized to maintain drilling safety.

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18

Aksenova, N. A., E. Yu Lipatov, and T. A. Haritonova. "EXPERIENCE IN CONSTRUCTION OF HORIZONTAL WELLS AT THE KOSHILSKOYE OIL FIELD." Oil and Gas Studies, no. 4 (August 30, 2018): 34–37. http://dx.doi.org/10.31660/0445-0108-2018-4-34-37.

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The article presents the experience of drilling horizontal wells at the Koshilskoye oil field in Jurassic sediments (UV1 formation) with application of environmentally safe emulsion drilling mud system BARADRIL-N XP-07 which has proved cost-effective.

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19

Roberts, Ruby Clyde, Rhona Flin, Jennifer Cleland, and Jim Urquhart. "Drillers’ Cognitive Skills Monitoring Task." Ergonomics in Design: The Quarterly of Human Factors Applications 27, no. 2 (May 10, 2018): 13–20. http://dx.doi.org/10.1177/1064804617744713.

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Drilling incidents have emphasized that offshore drillers require a high level of cognitive skills, including situation awareness and decision making, to maintain safe and efficient well control. Although a number of tools for supporting operators’ cognition are available in other high-risk industries, there is no specific tool for drilling. We developed a prototype monitoring task simulating drilling scenarios, Drillers’ Situation Awareness Task, with drilling experts and piloted with 14 drilling personnel. Preliminary results suggest that it is viable as a tool for examining drillers’ cognition and has the potential for training and formatively assessing cognitive skills in drilling.

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20

Liu, Chao, and Younane N. Abousleiman. "Multiporosity/Multipermeability Inclined-Wellbore Solutions With Mudcake Effects." SPE Journal 23, no. 05 (June 21, 2018): 1723–47. http://dx.doi.org/10.2118/191135-pa.

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Summary This paper investigates the effects of mudcake and formation multiporosity/multipermeability on the evolution of a safe-drilling mudweight window. The analytical poroelastic solutions for an inclined wellbore drilled through a multiporosity/multipermeability porous medium were derived, taking into account the mudcake buildup on the wellbore wall. A multiporosity/multipermeability porous medium consists of an overlapping of N distinct porous-continuum networks, each of which has its own geomechanical and petrophysical properties. Wellbore collapse and fracturing are investigated by studying a dual-porosity naturally fractured weak sandstone. The first porosity is matrix porosity, and the second porosity is the fractures. In addition, a triple-porosity source shale with multiple scales of natural fractures was modeled. The first porosity corresponds to the shale matrix one, and two scales of fracture distribution account for the other two sets of porosity. The Drucker and Prager (1952) criterion is applied to analyze wellbore collapse and shear failure, whereas the tensile strengths of both formations are considered, conservatively, as negligible. The safe-drilling mud-weight window is calculated to illustrate the time-dependent effects of formation N-porosity/N-permeability nature and the wellbore-wall boundary conditions (with/without mudcake). On the one hand, natural fractures narrow the safe-drilling mud-weight window by degrading rock strength and facilitating hydraulic-pressure invasion. On the other hand, the mudcake leads to a wider safe-drilling mud-weight window by generating compressive effective radial stress on the wellbore wall and impeding hydraulic-pressure invasion. Mudcake thickness and mudcake permeability are found to have significant effects. The drilling-mud design to build a mudcake on the wellbore wall is essential when drilling through difficult naturally fractured formations.

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Gaevaya, E. V., and S. S. Tarasova. "Disposal of drilling sludge with obtaining environmentally safe inert material." Environmental Protection in Oil and Gas Complex, no. 4 (2020): 53–58. http://dx.doi.org/10.33285/2411-7013-2020-4(295)-53-58.

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22

Thaemlitz, C. J., A. D. Patel, George Coffin, and Lee Conn. "New Environmentally Safe High-Temperature Water-Based Drilling-Fluid System." SPE Drilling & Completion 14, no. 03 (September 1, 1999): 185–89. http://dx.doi.org/10.2118/57715-pa.

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23

Tran, Minh H., Younane N. Abousleiman, and Vinh X. Nguyen. "The Effects of Filter-Cake Buildup and Time-Dependent Properties on the Stability of Inclined Wellbores." SPE Journal 16, no. 04 (August 3, 2011): 1010–28. http://dx.doi.org/10.2118/135893-pa.

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Summary The effects of filter-cake buildup and/or filter-cake-property variation with time on wellbore stability have been plaguing the industry. The increasing use of lost-circulation materials (LCMs) in recent years for wellbore strengthening in weak and/or depleted formations necessitates models that can predict these effects. However, the complexities of effective-stress and pore-pressure evolution around the borehole while drilling, coupled with the transient variation of mud-filtration properties, have delayed such modeling efforts. In this paper, the analytical solutions for the time-dependent effects of mudcake buildup and mudcake properties on the wellbore stresses and formation pore pressure, and thus the safe-drilling-mud-weight window, are derived. The transient effects of mudcake buildup and mudcake buildup coupled with its permeability reduction during filtration on the safe-drilling-mudweight window are illustrated through numerical examples. The results showed that the safe-mudweight windows were greatly affected by the buildup of filter cake and its permeability variation. For example, the analysis for filter-cake buildup with cake permeability of 10–2 md showed that the safe-mudweight window was widened by 0.5 g/cc after 2.5 hours post-excavation when compared to the case of a wellbore without mudcake. On the other hand, a lower mudcake permeability of 10–3 md widened the mudweight window by as much as 1 g/cc. Last but not least, the analyses revealed that even for mudcake permeability as low as 10–3 md, neglecting the permeable nature of the mudcake can result in overestimation of the safe-drilling-mudweight window.

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Zhu, Meng, Dave Yee Han Lee, and Andy Williams. "Safe Femoral Fixation Depth and Orientation for Lateral Extra-Articular Tenodesis in Anterior Cruciate Ligament Reconstruction." Orthopaedic Journal of Sports Medicine 9, no. 1 (January 1, 2021): 232596712097659. http://dx.doi.org/10.1177/2325967120976591.

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Background: Patients who undergo anterior cruciate ligament (ACL) reconstruction (ACLR) can have a persistent postoperative pivot shift. Performing lateral extra-articular tenodesis (LET) concurrently has been proposed to address this; however, LET femoral fixation may interfere with the ACLR femoral tunnel, which could damage the ACL graft or its fixation. Purpose: To evaluate the safe maximum implant or tunnel depth for a modified Lemaire LET when combined with ACLR anteromedial portal femoral tunnel drilling and to validate the safe LET drilling angles to avoid conflict with the ACLR femoral tunnel. Study Design: Descriptive laboratory study. Methods: Twelve fresh-frozen cadaveric knees were used. With each knee at 120° of flexion, an ACLR femoral tunnel in the anteromedial bundle position was created arthroscopically via the anteromedial portal using a 5-mm offset guide, a guide wire, and an 8-mm reamer, which was left in situ. A modified Lemaire LET was performed using a 1 cm-wide iliotibial band strip harvested with the distal attachment intact, to be fixed in the femur. The desired LET fixation point was identified with an external aperture 10 mm proximal and 5 mm posterior to the fibular collateral ligament’s femoral attachment, and a 2.4-mm guide wire was drilled, aiming at 0°, 10°, 20°, or 30° anteriorly in the axial plane and at 0°, 10°, or 20° proximally in the coronal plane (12 different drilling angle combinations). The relationship between the LET drilling guide wire and the ACLR femoral tunnel reamer was recorded for each combination. When a collision with the femoral tunnel was recorded, the LET wire depth was measured. Results: Collision with the ACLR femoral tunnel occurred at a mean LET wire depth of 23.6 mm (range, 15-33 mm). No correlation existed between LET wire depth and LET drilling orientation ( r = 0.066; P = .67). Drilling angle in the axial plane was significantly associated with the occurrence of tunnel conflict ( P < .001). However, no such association was detected when comparing the drilling angle in the coronal plane ( P = .267). Conclusion: Conflict of LET femoral fixation with the ACLR femoral tunnel using anteromedial portal drilling occurred at a mean depth of 23.6 mm but also at a depth as little as 15 mm, which is shorter than most implants. When longer implants or tunnels are used, the orientation should be directed at least 30° anteriorly in the axial plane to minimize the risk of tunnel conflict, bearing in mind the risk of joint violation. Clinical Relevance: This study provides important information for surgeons performing LET in combination with ACLR anteromedial portal femoral tunnel drilling regarding safe femoral implant or tunnel length and orientation.

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Alam, K., R. Muhammad, A. Shamsuzzoha, A. AlYahmadi, and N. Ahmed. "Quantitative Analysis of Force and Torque in Bone Drilling." Journal of Engineering Research [TJER] 14, no. 1 (March 1, 2017): 39. http://dx.doi.org/10.24200/tjer.vol14iss1pp39-48.

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Bone drilling is an important and the most frequent operation in orthopaedics and other bone surgical procedures. Prediction and control of drilling force and torque are critical to safe and efficient surgeries. This paper studies the drilling force and torque arising from bone drilling process. Drilling parameters such as drilling speed, feed rate, drill size and drill condition (sharp and worn) were changed to measure the force and torque in the direction of the drill penetration. Experimental results demonstrated lower drilling force using a sharp drill compared to a worn drill for similar drilling conditions. Contrary to the drilling force, lower torque was measured using a worn drill compared to a sharp drill. The drilling force was found to decrease with increase in drill speed and increased with rise in the feed rate using both types of drills. A linear drop in drilling torque was measured with increase in drilling speed. This study provided scientific information to orthopaedic surgeons and technicians to use appropriate surgical drill and cutting parameters to avoid overstressing of the bone tissue and drill breakage during drilling operations.

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Sullivan, Paul. "A risk management approach to safe mooring systems in Australia." APPEA Journal 56, no. 2 (2016): 550. http://dx.doi.org/10.1071/aj15056.

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In March 2015, during cyclone Olwyn, a mobile offshore drilling unit (MODU) experienced a mooring failure and loss of position event. The MODU was blown some three nautical miles off location in the vicinity of subsea and surface infrastructure. There are serious safety, environmental, financial, and reputational risks that can be presented by a loss of mooring position. In response, NOPSEMA hosted a workshop with members of APPEA, the International Drilling Contractors Association (IADC) and with mooring contractors with a view to collectively improve the management of risks associated with the mooring of MODUs in Australia’s tropical waters, both in the short and longer term. Following this workshop, NOPSEMA issued an Information Note for the 2015/16 cyclone season, describing the regulators’ expectations of industry duty holders in respect of MODU mooring system management. At the same time, APPEA’s Drilling Industry Steering Committee (DISC) members aligned on the key principles underpinning a MODU mooring system approach. In late 2015, the APPEA DISC members commissioned a working group to develop a guidance framework for MODU mooring management in Australian tropical waters. DISC aims to work closely with industry partners such as IADC and specialist mooring contractors in the development of this framework. DISC has tasked the working group to have the guidance framework ready for the 2016/17 cyclone season, and for presentation at the 2016 APPEA Conference. The completed case study, presented at the APPEA Conference, provides an excellent example of a goal-setting and continuous improvement regulatory regime working as designed and intended.

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Selva, Jacqueline J. A., Marianne O. Bergere, Ibrahim Hammoud, Caroline Sebaoun, Raoul Lombroso, and François Vialard. "Is laser drilling and polar body biopsy safe for the oocyte?" Fertility and Sterility 80 (September 2003): 194–95. http://dx.doi.org/10.1016/s0015-0282(03)01422-5.

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Islamov, Kh M. "Highly inhibiting environmentally safe drilling solution used when deepening a well." Construction of Oil and Gas Wells on Land and Sea, no. 10 (2019): 33–35. http://dx.doi.org/10.30713/0130-3872-2019-10-33-35.

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Puangmali, Pinyo, Somphop Jetdumronglerd, Theeraphong Wongratanaphisan, and Matthew O. T. Cole. "Sensorless stepwise breakthrough detection technique for safe surgical drilling of bone." Mechatronics 65 (February 2020): 102306. http://dx.doi.org/10.1016/j.mechatronics.2019.102306.

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Bagheri, Hassan, and Figen Govsa. "Anatomical considerations of safe drilling corridor upper sacral segment screw insertion." Journal of Orthopaedics 16, no. 6 (November 2019): 543–51. http://dx.doi.org/10.1016/j.jor.2019.04.010.

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Hu, Yu Le, Tao Yang, and Guo Wei Yang. "Application of Virtual Instrument in Geological Exploration Equipment." Advanced Materials Research 798-799 (September 2013): 302–6. http://dx.doi.org/10.4028/www.scientific.net/amr.798-799.302.

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To ensure wire-line core drilling process more safe, efficient and quality, a real time monitoring and control system for drilling rig was built based on virtual instrument technology. Currently, the geological exploration have more precise requirements of many parameters, this system is very helpful for geological exploration. The system took IPC as main controller and used multi-sensors through DAQ card or serial port to monitor multi-parameters. Simultaneously, instructions ordered by host computer through digital-to-analog output card transmit to actuator, such as solenoid valve, to control drilling processs parameters. LabVIEW graphic oriented software platform provides a flexible and reliable support for drilling parameters supervisory control and data acquisition system. This applied engineering software offers a complete monitoring for several parameters of drilling rig.

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Yusubova, V. R. "LAPAROSCOPIC DRILLING OF OVARIES: PRO AND CONTRA." V.F.Snegirev Archives of Obstetrics and Gynecology 4, no. 2 (June 15, 2017): 68–72. http://dx.doi.org/10.18821/2313-8726-2017-4-2-68-72.

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Laparoscopic ovarian drilling is now considered to be a safe and effective surgical method. The frequency of the onset of pregnancy is similar tothat of the therapeutic methods of ovulation induction. At the same time, a lower risk of ovarian hyperstimulation syndrome and multiple pregnancies makes drilling more preferable to gonadotropin therapy. Despite the advantages of this method of surgical treatment, the issue of possible complications still remains to be relevant.

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Iqbal, Raheel, Fawad Pirzada, Muhammad Zubair, and Ameer Mehmood. "An experimental study on performace of starch extracted from wheat flour as filtration control agent in drilling fluid." International Journal of Advances in Applied Sciences 9, no. 4 (December 1, 2020): 255. http://dx.doi.org/10.11591/ijaas.v9.i4.pp255-260.

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<span>The phenomenon of lost of mud filtrate into a porous permeable formation due to high hydrostatic pressure compared to the formation pressure is known as fluid loss. This cause some major problems in well during drilling as poor cementing job, pipe stuck, and formation damage. Thus, to safe the well from such problems and in order to make safe and effective drilling an additive from wheat flour is extracted which is starch, and acting as a fluid loss control agent. The purpose of this research is to investigate the potential of utilizing this additive to form environmentally safe, non-toxic, high biodegradability and low-cost water-based drilling fluid samples with varying the amount of starch. Experimental results showed that Efficiency of starch obtained from wheat-flour is showing increment in rheological properties as compare to starch present in market by using same and varying quantity of both and observed that wheat-flour starch is more efficient as compare to starch in market. On the other hand, the efficiency of starch is good but it has been also improved by the extraction of starch from wheat-flour by the centrifugation process.</span>

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Wang, Long Peng, Jun Gao, Jian Ming Zhang, and Zhi Jun Shi. "Development of Uphole Monitor for MWD in Underground Directional Drilling in Coalmine." Advanced Materials Research 605-607 (December 2012): 1929–33. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1929.

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Measurement while drilling (MWD) is the key for underground directional drilling in coalmine. In this paper, an uphole monitor for MWD is developed to process and display downhole measure data. Firstly, an explosion-proof computer is developed, which can be used in explosive gas atmosphere. The flameproof enclosure and intrinsic safe type of protection have been employed to meet the needs of explosion-proof and communication with measure unit. A Windows-based software is subsequently developed to show the measure result and generate the in-seam drilling trajectory. The uphole monitor has been integrated into directional drilling system and demonstrated by the application in China’s coalmines.

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Jie, Lian. "Research on the measurement system of drilling while engineering parameters for intelligent drilling in coal mine." E3S Web of Conferences 165 (2020): 03036. http://dx.doi.org/10.1051/e3sconf/202016503036.

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In order to ensure safe and efficient mining and improve the efficiency of drilling construction, intelligent drilling technology has been studied in China. This technology is another development on the basis of automation. In addition to the automatic execution of the construction process, it also has the characteristics of intelligent perception, intelligent decision-making and intelligent correction. This technology requires engineering parameter measuring equipment to obtain the engineering parameters such as torque, WOB, inner and outer annulus pressure, rotation speed, vibration, temperature, etc. near the drill bit at the bottom of the hole in real time, so as to realize the real-time monitoring of the drilling process parameters at the bottom of the hole and the stress state of the drilling tool in the process of directional drilling, and increase the effective extraction distance of the drilling hole.

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Gosink, T. A., J. J. Kelley, B. R. Koci, T. W. Burton, and M. A. Tumeo. "Butyl acetate, an alternative drilling fluid for deep ice-coring projects." Journal of Glaciology 37, no. 125 (1991): 170–76. http://dx.doi.org/10.1017/s0022143000042921.

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Abstract Deep-drilling operations in glaciers require a fluid to maintain hydrostatic equilibrium and prevent closure due to plastic flow of the ice. Many past practices have employed various fluid mixtures using fuel oil as the base. The case for butyl acetate is presented here as an adequately dense and environmentally safe drilling fluid. Results from the 1990 drill season are highly favorable.

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Gosink, T. A., J. J. Kelley, B. R. Koci, T. W. Burton, and M. A. Tumeo. "Butyl acetate, an alternative drilling fluid for deep ice-coring projects." Journal of Glaciology 37, no. 125 (1991): 170–76. http://dx.doi.org/10.3189/s0022143000042921.

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Abstract Deep-drilling operations in glaciers require a fluid to maintain hydrostatic equilibrium and prevent closure due to plastic flow of the ice. Many past practices have employed various fluid mixtures using fuel oil as the base. The case for butyl acetate is presented here as an adequately dense and environmentally safe drilling fluid. Results from the 1990 drill season are highly favorable.

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Liu, Wei, Ying Cao Zhou, and Qing Zhao. "A New Analytical Model on Lateral Vibration and Impact of Drill String - Choice of Safe and Fast Drilling." Applied Mechanics and Materials 29-32 (August 2010): 2350–55. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.2350.

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The severe lateral vibration and impact of drill string will not only cause the damage of drill string but also have bad effects on the quality of directional drilling operation. It is difficult to control lateral vibration amplitude and impact intensity even with advanced measurement apparatus while drilling. So it is feasible to use a theoretic method to analyze and predict lateral vibration of drill string in order to adjust and optimize drilling parameters in real-time. On the basis of beam-column series and spring-concentrated mass model, a new analytical model is established to realize the control of lateral vibration and impact by controlling some key factors, such as under-gauge stabilizer, initial phase angle and initial deformation, WOB (weight on bit) and ROB (rotation of bit).

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Giuseppe, De Natale, Troise Claudia, Somma Renato, and Giovanni Perillo. "The Campi Flegrei deep drilling project (CFDDP): Caldera structure and hazard." International Journal of Safety and Security Engineering 7, no. 3 (September 30, 2017): 443–48. http://dx.doi.org/10.2495/safe-v7-n3-443-448.

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Wang, Yao Kui, Rui Zhao Yang, Nan Chen, Tian Zhang, and Ji Fu Liu. "Improving the SNR of SWD Data by Adjusting the Impact Energy of Drilling Tools." Applied Mechanics and Materials 670-671 (October 2014): 1242–46. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.1242.

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Seismic while drilling (SWD) technology, taking advantage of the vibration signal generated during the drill bit breaking rocks in drilling operations, has been used in the seismic explorations. Since the energy of signals produced by the seismic origin is weak while the noise jamming in the drilling site is strong, the signal-to-noise ratio (SNR) of collected SWD data is usually fairly low. In this paper, we focused on improving the SNR of SWD data via adjusting the impact energy of drilling tools. Based on the explanation of the working principle of SWD systems, the energy formation modes of three kinds of drilling tools were discussed. It was safe to expect that the hydraulic torque impactor could be applicable to improve the SNR of SWD data in evidence.

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Long, Risheng, Shaoni Sun, and Zisheng Lian. "Research on the Hard-Rock Breaking Mechanism of Hydraulic Drilling Impact Tunneling." Mathematical Problems in Engineering 2015 (2015): 1–34. http://dx.doi.org/10.1155/2015/153648.

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In order to realize the rapid hard-rock tunneling in a safe, highly effective, and economic manner, the hydraulic drilling impact hard-rock tunneling (HDIHT) technology and method were introduced based on the theories of rock mechanics and hydraulic impact. The key parameters, including drilling radius and impact distance, were researched to reveal the stress behavior during HDIHT process. The Von Mises equivalent stress and its principal stress components were analyzed, and the breaking mechanism of HDIHT was also discussed. The simulation results show that, to ensure the effectiveness of “secondary breaking” caused by drilling hole free surfaces, the impact distance should not exceed 200 mm, and the optimal drilling radius was about 35 mm.

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Jiang, Hua, and Yi Luo. "Development of a roof bolter drilling control process to reduce the generation of respirable dust." International Journal of Coal Science & Technology 8, no. 2 (February 27, 2021): 199–204. http://dx.doi.org/10.1007/s40789-021-00413-9.

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AbstractThe drilling operation in the roof bolting process, especially in hard rock, generates excessive respirable coal and quartz dusts, which could expose the roof bolting operator to continued health risks. Previous research has shown that the amount of respirable dust produced is dependent on the main drilling parameters, specifically the drilling rotational and penetration rate. In this paper, a roof bolter drilling control process was proposed to reduce the generation of respirable dust. Based on the analysis of laboratory drilling test results, a rational drilling control process (adjusting rotational and penetration rates) to achieve the optimal drilling parameter for different rock types was proposed. In this process, the ratio between specific energy and rock uniaxial compressive strength was used as the index to determine the optimal operation point. The recommended drilling operation range for the rock type used in the experiment was provided, and the reduction in respirable dust generation was demonstrated. By following this control process, the drilling efficiency can be monitored in real time, so the system can stay in a relatively high-energy efficiency with less respirable dust production from the drilling source. This algorithm is targeted to be incorporated into the current roof bolter drilling control system for drilling automation so that a safe and productive drilling operation can be conducted in a healthy working environment.

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Whitby, David, Budi Utama, and Richard Reading. "Total Depth Solutions' technologies provide effective, efficient and safe well construction method to mitigate borehole problems." APPEA Journal 51, no. 1 (2011): 459. http://dx.doi.org/10.1071/aj10029.

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Permit TL/2 in the Carnarvon Basin, WA, presents several challenges for top hole drilling and casing running operations. Previous experience showed that drilling the 16” hole section and running 13⅜” casing was typically a time consuming phase of the well due to fluid losses and tight hole conditions, consequently requiring the use of seawater to drill, back reaming, wiper trips and occasional spotting of pills. The initial solution delivered to the operator as an alternative method to get 13⅜” casing to total depth (TD) was to employ a casing drill bit to ream the casing to bottom while also delivering an improved drill-out time. This would be coupled with a sophisticated, unique, reliable and simply operated top drive casing running system that was already installed on the rig. Reviewing the Weatherford Total Depth Solutions teamâs systems with cost, time and capabilities analysis, the operator was certain that the application of a complete drilling with casing system (DwC™) would mitigate the known hole problems and yield a safe and more cost-effective surface hole operation, significantly reducing non-productive time (NPT). This paper reviews: the problems that were traditionally encountered during conventional surface hole drilling and casing running operations; the decision-making process that the operator followed prior to employing DwC technology; and, the hazard mitigation and economic benefits realised through a one-way trip to total depth of about 1,000 m TVDRT, which broke to date the longest Weatherford 13⅜” DwC interval globally by the service company and operator.

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Macnar, Kazimierz, Andrzej Gonet, and Stanisław Stryczek. "Wybrane zagadnienia geotechniczne posadowienia urządzeń wiertniczych." Nafta-Gaz 77, no. 5 (May 2021): 313–22. http://dx.doi.org/10.18668/ng.2021.05.04.

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This article presents selected geotechnical issues occurring at the foundation of drilling rigs for geological works included in the Operation Plan of a company performing geological works, in the aspect of designing and construction of their foundations and a yard. In the construction of drilling equipment, at least two main zones can be distinguished, often requiring separate foundations for individual machines: the zone near the borehole, including crane components, mast and drill pipe drive, and the so-called machine hall zone, including drive units and elements of mud system. The machine foundation is designed to mount a particular type of machine on it in order to transfer to the ground the static and dynamic loads generated during the movement of the machine. In particular, the current legislation, technical literature and standards were reviewed, especially: API recommended practice 51R and 4G, Working platforms for tracked plant, Eurocode 7 PN-EN 1997-2:2009 Standard. The values of safe bearing capacity of some soils and the magnitude of pressures generated by static and dynamic loads of selected drilling equipment were presented, which can be useful for preliminary assessment of the location of drilling equipment in the field and selection of surface and type of foundations. Typical examples of foundation of drilling rigs in various geotechnical conditions on direct foundations with the use of prefabricated elements such as reinforced concrete road slabs, wooden slabs and composite slabs based on HDPE plastic or on indirect ones with the use of micropiles were described. The following essential elements of the process of geotechnical design of the foundation of drilling rigs and their execution were indicated. According to legal regulations, the form of presentation of geotechnical foundation conditions and the scope of necessary tests should depend on assigning the building structure to a proper geotechnical category, which for practical purposes is tabulated in this article. The design and construction of foundations for drilling rigs should ensure, among other things, that their intrinsic vibrations are sufficiently different from those induced by subassemblies of the rig, that the vibration amplitudes are smaller than permissible, and that the foundations of individual machines are adequately separated from each other and from the rest of the facilities (yard). Conclusions on the safe foundation of drilling rigs on the ground, including, among others, the strengthening of the ground, design of independent building structures such as foundations for drilling rigs and their execution and removal were presented.

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Nee, Lim Symm, Badrul Mohamed Jan, Brahim Si Ali, and Ishenny Mohd Noor. "The Effects of Glass Bubbles, Clay, Xanthan Gum and Starch Concentrations on the Density of Lightweight Biopolymer Drilling Fluid." Applied Mechanics and Materials 625 (September 2014): 526–29. http://dx.doi.org/10.4028/www.scientific.net/amm.625.526.

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It is an open secret that currently oil and gas industry is focusing on increasing hydrocarbon production through underbalanced drilling (UBD) and finding ways to ensure the drilling process is less harmful to the environment. Water-based biopolymer drilling fluids are preferred compared to oil based drilling fluids owing to the fact that it causes less pollution to the environment. This paper investigates the effects of varying concentrations of environmentally safe raw materials, namely glass bubbles, clay, xanthan gum and starch concentrations on the density of the formulated biopolymer drilling fluid to ensure that it is suitable for UBD. As material concentrations were varied, the density for each sample was measured at ambient temperature and pressure. Results showed that the final fluid densities are within acceptable values for UBD (6.78 to 6.86 lb/gal). It is concluded that the formulated water-based biopolymer drilling fluid is suitable to be used in UBD operation.

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Błaż, Sławomir, Grzegorz Zima, Bartłomiej Jasiński, and Marcin Kremieniewski. "Invert Drilling Fluids with High Internal Phase Content." Energies 14, no. 15 (July 27, 2021): 4532. http://dx.doi.org/10.3390/en14154532.

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One of the most important tasks when drilling a borehole is to select the appropriate type of drilling fluid and adjust its properties to the borehole’s conditions. This ensures the safe and effective exploitation of the borehole. Many types of drilling fluids are used to drill holes for crude oil and natural gas. Most often, mainly due to cost and environmental constraints, water-based muds are used. On the other hand, invert drilling fluids are used for drilling holes in difficult geological conditions. The ratio of the oil phase to the water phase in invert drilling fluids the most common ratio being from 70/30 to 90/10. One of the disadvantages of invert drilling fluids is their cost (due to the oil content) and environmental problems related to waste and the management of oily cuttings. This article presents tests of invert drilling fluids with Oil-Water Ratio (OWR) 50/50 to 20/80 which can be used for drilling HPHT wells. The invert drilling fluids properties were examined and their resistance to temperature and pressure was assessed. Their effect on the permeability of reservoir rocks was also determined. The developed invert drilling fluids are characterized by high electrical stability ES above 300 V, and stable rheological parameters and low filtration. Due to the reduced content of the oil, the developed drilling fluid system is more economical and has limited toxicity.

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Gajec, Monika, Ewa Kukulska-Zając, and Anna Król. "Optimization of Silver Nanoparticle Separation Method from Drilling Waste Matrices." Energies 14, no. 7 (April 1, 2021): 1950. http://dx.doi.org/10.3390/en14071950.

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Significant amounts of produced water, spent drilling fluid, and drill cuttings, which differ in composition and characteristics in each drilling operation, are generated in the oil and gas industry. Moreover, the oil and gas industry faces many technological development challenges to guarantee a safe and clean environment and to meet strict environmental standards in the field of processing and disposal of drilling waste. Due to increasing application of nanomaterials in the oil and gas industry, drilling wastes may also contain nanometer-scale materials. It is therefore necessary to characterize drilling waste in terms of nanomaterial content and to optimize effective methods for their determination, including a key separation step. The purpose of this study is to select the appropriate method of separation and pre-concentration of silver nanoparticles (AgNPs) from drilling wastewater samples and to determine their size distribution along with the state of aggregation using single-particle inductively coupled plasma mass spectrometry (spICP-MS). Two AgNP separation methods were compared: centrifugation and cloud point extraction. The first known use of spICP-MS for drilling waste matrices following mentioned separation methods is presented.

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Adewale, Orelaja Oluseyi, Donghua Shen, Xingsong Wang, Lan Li, and Tianzheng Zhao. "Experimental measurement of force, torque control and vibration absorber system for intraoperative tele-operated robotic-assisted femoral shaft drilling using air-controlled soft balloon damper." Transactions of the Institute of Measurement and Control 43, no. 11 (April 1, 2021): 2525–39. http://dx.doi.org/10.1177/01423312211000928.

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The use of closed intramedullary nailing fixation and drilling technique is a very common, safe and standard method for treating diaphyseal femoral fractures. However, it has several demerits such as high cutting forces and torque during drilling and this could cause high vibration and result in cracks, tool breakage and necrosis of the already fractured bone. This paper presents the measure of force, torque control and vibration absorber system for intra-operative tele-operated robotic-assisted femoral shaft drilling using air-controlled balloon damper experimentally, since bone is surrounded by soft tissues that can cause more severe injury to the tissue due to high traction force. Simulated femur bone and tissue are used for this experiment. A sensor-based model clamping system embedded with controlled pressurized air balloon to damp drilling vibration was developed; the drilling forces were monitored by the force sensor attached to the end robot effector, while the resulted vibration was measured by contact sensor during the entire surgical drilling. Forces and vibration caused by drilling forces acting on the bone at varying damper pressure at varying spindle drill speed were obtained using (EMS 309 data acquisition and then the data were processed using MATLAB R2015b. The vibration results were processed with wavelet packet transform (WPT) using Fast Fourier transform to analyze the vibration signals, frequencies and amplitude of the vibration. This modeled control system is a good concept, results clearly justify that soft clamping fixation system can be employed to reduce force, torque and vibration without causing harm to the delicate surrounding tissues. This control measures can provide surgeons with real-time information which can assist them in repositioning and repair of fracture bone within control and safe margins. It is believed that this idea will have greater future developmental prospect.

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Henglin, Yang, Chen Mian, and Zhang Guangqing. "Deformation mechanisms and safe drilling fluids density in extremely thick salt formations." Petroleum Science 4, no. 4 (December 2007): 56–61. http://dx.doi.org/10.1007/bf03187456.

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Hao, Cao. "Research on safe and efficient drilling technology of soft outburst coal seam." IOP Conference Series: Earth and Environmental Science 804, no. 2 (July 1, 2021): 022012. http://dx.doi.org/10.1088/1755-1315/804/2/022012.

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Journal articles on the topic 'Safe drilling'

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