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1
Cooper, George A. "Directional Drilling." Scientific American 270, no. 5 (May 1994): 82–87. http://dx.doi.org/10.1038/scientificamerican0594-82.
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Li, Wangnian, Min Wu, Shipeng Chen, Lingfeng Mu, Chengda Lu, and Luefeng Chen. "Design of an Intelligent Control System for Compound Directional Drilling in Underground Coal Mines." Journal of Advanced Computational Intelligence and Intelligent Informatics 28, no. 4 (July 20, 2024): 1052–62. http://dx.doi.org/10.20965/jaciii.2024.p1052.
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The compound directional drilling process, including slip and rotation, is the key to realizing long-hole drilling in coal mines. First, a compound directional drilling process control scheme is proposed to realize intelligent control of the directional drilling process. An intelligent drilling process optimization method was designed to improve drilling efficiency. A robust controller for the drilling rate based on gain scheduling was designed to achieve stable control of the drilling rate during sliding deflection drilling. A robust controller based on hybrid sensitivity was designed to achieve stable control of the drilling rate during rotary inclined stabilization drilling. The results of this study can provide a theoretical basis for realizing the intelligent optimization and control of compound directional drilling in coal mines.
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Ariaratnam, Samuel T., Erez N. Allouche, and Kevin W. Biggar. "Testing of a new generation horizontal soil sampler." Canadian Geotechnical Journal 37, no. 1 (February 1, 2000): 259–63. http://dx.doi.org/10.1139/t99-097.
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Sampling using horizontal directional drilling allows the collection of soil samples from suspected zones located beneath structures and other surface-subsurface obstacles. However, current horizontal sampling techniques are time consuming and thus expensive. This paper describes the design and testing of a new multiple-port sampler for collection of soil samples from directionally drilled boreholes. The device uses a new methodology for horizontal sampling to improve cost-effectiveness and sample quality.Key words: horizontal directional drilling, horizontal wells, design, remediation, site characterization, sampling.
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Teplukhin, Vladimir K. "Increasing the accuracy of the directional survey when drilling oil and gas wells." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal 6 (September 15, 2021): 32–41. http://dx.doi.org/10.21440/0536-1028-2021-6-32-41.
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Introduction. The method оf directional survey is currently widely used when drilling horizontal and directional wells for oil and gas. The method includes a relatively cumbersome and complex system of 40 “Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal”. No. 6. 2021 ISSN 0536-1028 sequential operations of converting the components of the Earth’s magnetic field into proportional electrical signals using magnetometers, amplifying and scaling sensor signals, integrating analog-todigital conversion of electrical signals, determination of the three components of magnetic fields from the measured output signals of geosteering sensors, and additional introduction of various kinds of corrections to determine the survey parameters of the bottom. Methods of research. The main objective of the research is to improve the accuracy of the directional survey while drilling directional wells for oil and gas. The process of drilling provides accurate online compensation for interference from large ferromagnetic complexes in the bottomhole assembly acting on the sensors of the inclinometer magnetic field components. The developed method for increasing the accuracy of the directional survey when drilling directional wells online eliminates the need for various additional corrections in the course of the drilled well bottom geometric position measurement. Results and analysis. Analytical studies of the structure of the noise created by various magnetic blocks included in the drillsting assembly during installation have been carried out. A specialized device has been developed to control the directional survey process when drilling directional wells. A relatively simple set of processes reduced to magnetic blocks location data and geometric parameters introduction has been developed together with a working system including a microprocessor and compensation solenoids. It made it possible to obtain actual data on the spatial location of the drill string bottom in real time
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Teplukhin, Vladimir K. "Increasing the accuracy of the directional survey when drilling oil and gas wells." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal 6 (September 15, 2021): 32–41. http://dx.doi.org/10.21440/0536-1028-2021-6-32-41.
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Introduction. The method оf directional survey is currently widely used when drilling horizontal and directional wells for oil and gas. The method includes a relatively cumbersome and complex system of 40 “Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal”. No. 6. 2021 ISSN 0536-1028 sequential operations of converting the components of the Earth’s magnetic field into proportional electrical signals using magnetometers, amplifying and scaling sensor signals, integrating analog-todigital conversion of electrical signals, determination of the three components of magnetic fields from the measured output signals of geosteering sensors, and additional introduction of various kinds of corrections to determine the survey parameters of the bottom. Methods of research. The main objective of the research is to improve the accuracy of the directional survey while drilling directional wells for oil and gas. The process of drilling provides accurate online compensation for interference from large ferromagnetic complexes in the bottomhole assembly acting on the sensors of the inclinometer magnetic field components. The developed method for increasing the accuracy of the directional survey when drilling directional wells online eliminates the need for various additional corrections in the course of the drilled well bottom geometric position measurement. Results and analysis. Analytical studies of the structure of the noise created by various magnetic blocks included in the drillsting assembly during installation have been carried out. A specialized device has been developed to control the directional survey process when drilling directional wells. A relatively simple set of processes reduced to magnetic blocks location data and geometric parameters introduction has been developed together with a working system including a microprocessor and compensation solenoids. It made it possible to obtain actual data on the spatial location of the drill string bottom in real time
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Novrianti, Novrianti, Rycha Melisa, and Rafhie Adrian. "Kick-Off Point (KOP) and End of Buildup (EOB) Data Analysis in Trajectory Design." Journal of Geoscience, Engineering, Environment, and Technology 2, no. 2 (June 1, 2017): 133. http://dx.doi.org/10.24273/jgeet.2017.2.2.302.
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Well X is a development well which is directionally drilled. Directional drilling is choosen because the coordinate target of Well X is above the buffer zone. The directional track plan needs accurate survey calculation in order to make the righ track for directional drilling. There are many survey calculation in directional drilling such as tangential, underbalance, average angle, radius of curvature, and mercury method. Minimum curvature method is used in this directional track plan calculation. This method is used because it gives less error than other method. Kick-Off Point (KOP) and End of Buildup (EOB) analysis is done at 200 ft, 400 ft, and 600 ft depth to determine the trajectory design and optimal inclination. The hole problem is also determined in this trajectory track design. Optimal trajectory design determined at 200 ft depth because the inclination below 35º and also already reach the target quite well at 1632.28 ft TVD and 408.16 AHD. The optimal inclination at 200 ft KOP depth because the maximum inclination is 18.87º which is below 35º. Hole problem will occur if the trajectory designed at 600 ft. The problems are stuck pipe and the casing or tubing will not able to bend.
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Deryaev, A. R. "Drilling of directional wells in the fields of Western Turkmenistan." SOCAR Proceedings, SI2 (December 31, 2023): 22–31. http://dx.doi.org/10.5510/ogp2023si200875.
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The article focuses on the experience of drilling directional wells and cluster drilling in the oil and gas fields of Western Turkmenistan. The paper defines the direction of development of technology for drilling directional wells, taking into account the development of technology at the present time. Proposals are given and equipment, as well as materials possible for cluster drilling of directional wells in the Southwestern part of Turkmenistan are identified. Applied technical and technological innovations that meet international standards have ensured the successful completion of cluster drilling of a number of directional wells in the fields of Southwestern Turkmenistan. This work will mark the beginning of the development of cluster drilling of deep directional wells with abnormally high reservoir pressures and will create an impetus for technical re-equipment, as well as organizational restructuring of cluster drilling on a scientific basis. Keywords: horizontal termination; boreholes; landscape; casing; cement; formation; mining; сluster drilling; trajectory; curvature mechanism.
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Panichaporn, Weerapong, Ruktai Prurapark, and Kitipat Siemanond. "Simulation of Drilling Pressure Profile in Directional Drilling and User Program Development." International Journal of Materials, Mechanics and Manufacturing 3, no. 4 (2015): 255–60. http://dx.doi.org/10.7763/ijmmm.2015.v3.206.
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Warren, Tommy M., Bruce D. Houtchens, and Garret Madell. "Directional Drilling with Casing." SPE Drilling & Completion 20, no. 01 (March 1, 2005): 17–23. http://dx.doi.org/10.2118/79914-pa.
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Eren, Tuna, and Vural Sander Suicmez. "Directional drilling positioning calculations." Journal of Natural Gas Science and Engineering 73 (January 2020): 103081. http://dx.doi.org/10.1016/j.jngse.2019.103081.
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Li, Yaobin, Tao Jiang, and Xin Guo. "Research on Gas Extraction Technology of Directional Long Borehole in Ultrathick Coal Seam." Geofluids 2022 (March 14, 2022): 1–12. http://dx.doi.org/10.1155/2022/6957896.
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Gas extraction is an important way to control gas disasters. The effect of traditional gas extraction drilling on ultrathick coal seam is not well. In order to improve the rate of gas extraction, directional long drilling is used to replace conventional drilling for coal seam gas extraction. Through the combination of numerical simulation and field experimentation, the stress distribution around borehole is analyzed, and the influence of different time, different gas pressure, different negative pressure of extraction, and different permeability of coal body on directional borehole is simulated. According to the experimentation of Baode Mine, the data of gas drainage volume of conventional directional drilling are recorded and analyzed. The results indicate that the directional drilling is more suitable for Baode Mine 81306 working face of coal seam 8 gas extraction operation. Directional drilling is better than conventional drilling in work, with good drainage stability and large gas drainage volume, which can greatly reduce the outburst time and improve the gas drainage rate.
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Wu, Ying, Peng Zhang, and Xiao Li. "Study on the Drilling Formation Selection and Risk Analysis of the Directional Drilling." Advanced Materials Research 461 (February 2012): 652–55. http://dx.doi.org/10.4028/www.scientific.net/amr.461.652.
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Directional drilling technology is an important and very promising trenchless pipeline crossing technology. On the basis of the related literature research at home and abroad and our pipeline construction site investigation, focuses on several common soil properties are introduced, and then the formation adaptability of directional drilling is analyzed. The drilling selection methods are made when drilling in the specific geological conditions, and the possible risks of the construction process have been classified in the directional drilling.
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Ma, Yukun, and Yanpeng Xu. "Research into technology for precision directional drilling of gas-drainage boreholes." Mining of Mineral Deposits 16, no. 2 (June 30, 2022): 27–32. http://dx.doi.org/10.33271/mining16.02.027.
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Purpose. In order to solve the serious problem of borehole deflection in coal mine gas drainage, the precision directional drilling tool has been developed and improved, as well as the general borehole deflection laws have been studied. Methods. By using ordinary drilling pipes, one set of precision directional drilling tool and two sets of precision directional drilling tools, gas-drainage boreholes have been drilled in the mine and, subsequently, the borehole trajectory parameters have been measured using an inclinometer. Findings. The borehole inclination angle first tends to decrease and then to increase, while the azimuth angle generally increases. The precision directional drilling tool is effective, especially when using two sets of drilling tools. In this case, the average 100-meter final borehole deflection is reduced by 66.0%, the average inclination angle is reduced by 52.3%, and the average azimuth angle is reduced by 46.5%. Originality. A tool for precision directional drilling has been developed and improved, and its effectiveness has been confirmed; the general laws of borehole deflection have been summarized from the overall for subsection intervals. Practical implications. The research results are of great guiding significance for preventing the gas-drainage borehole deflections and further research on the tool for precision directional drilling.
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Mukhametgaliev, I. D., A. Kh Agliullin, D. I. Chistov, and A. R. Yakhin. "ANALYTICAL STUDIES OF THE INTERACTION OF DRILLING STRING ASSEMBLY WITH THE WALLS OF WELL WITH HORIZONTAL TAILING-IN." Problems of Gathering Treatment and Transportation of Oil and Oil Products, no. 6 (December 21, 2023): 29–39. http://dx.doi.org/10.17122/ntj-oil-2023-6-29-39.
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In modern conditions of well construction, it is necessary to develop and apply the most effective and economically profitable solutions for oil and natural gas industry. Drilling companies need to reduce the cost of drilling wells, especially those with directional and horizontal ones. One of the ways to reduce the cost of drilling directional wells and wells with horizontal termination is to improve calculation models that optimize the selection of parameters of the elements of the drilling string assembly for directional drilling. The issue of developing a methodology for calculating the deflecting force of the drilling string assembly remains relevant when using rotary controlled systems and non-magnetic drilling collars of a telemetry module with a downhole motor for drilling directional wells and wells with a horizontal termination. In connection with the sanctions and the changing geopolitical situation, it seems relevant to
improve the software in order to import substitution of the following products: Advantage, Wellplan, Compass, Schlumberger Drilling Office, Wellarchitect, Bhasyspro. The stiffness characteristics of the downhole tool, which can be calculated on the basis of the above software, do not allow the selection of individual elements of the drilling string assembly with the possibility of predicting the deflecting force on the bit, and thus there is no possibility of analyzing the intensity of the set of curvature of the trajectory of directional wells and wells with a horizontal termination.
In this regard, improving the methodology for selecting the parameters of the elements of the drilling string assembly for directional drilling and increasing the efficiency of its operation is an urgent task and can contribute to the further intensive development of well drilling technology.
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Song, Yubo. "Research on gas drainage technology and equipment of high-level directional drilling in coal mine." E3S Web of Conferences 528 (2024): 01019. http://dx.doi.org/10.1051/e3sconf/202452801019.
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The gas overrun at the upper corners of the goaf and return air lanes has been restricting the development of China's coal mining industry. To solve the problem of over-limit gas concentration at the upper corners, the fundamental reason is to reduce the gas concentration in the "fracture zone" of the coal roof . At present, the most commonly used methods such as high extraction roadway, buried pipe extraction, and high-level drilling in the "fracture zone" gas control of the goaf have the disadvantages of excessive cost and heavy workload, and the drilling trajectory of conventional drilling rigs cannot be accurately positioned problem. Therefore,it is proposed to use high-position roof directional long drilling technology to replace traditional high-drainage roadway for gas control, and analyze the influence of directional drilling diameter, position, depth and other parameters on gas drainage efficiency. Based on the analysis of four drilling cases of the directional drilling rig ZYWL-13000DS of China Coal Science and Industry Group Chongqing Research Institute Co., Ltd. at 33 (4) 13 working face of Shuangliu Coal Mine, from the perspective of construction effect,the directional drilling is a more reasonable construction level 5-8 times the mining height above the roof is appropriate; the construction diameter should be as large as possible when conditions permit;when the drilling depth is 20m deep into the fissure zone, the pumping capacity will increase greatly, and with the construction of the mining, pumping Capabilities tend to stabilize. Compared with the traditional high-drainage road control effect, the use of directional long drilling technology for gas drainage can reduce the cost by more than 70% and shorten the effective construction period by more than 75%. It is finally verified that the use of high-directional directional long drilling technology can replace the high-drainage roadway for "fracture zone" gas drainage.
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Carpenter, Chris. "Slide-Drilling Guidance System Optimizes Directional Drilling Path." Journal of Petroleum Technology 72, no. 05 (May 1, 2020): 66–67. http://dx.doi.org/10.2118/0520-0066-jpt.
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Jialin, Tian, Tang Lei, Hu Xuehua, and Song Haolin. "Dynamic Characteristics of New Mechanical Rotary Steerable Tool in Directional Drilling." International Journal of Acoustics and Vibration 27, no. 4 (December 24, 2022): 334–43. http://dx.doi.org/10.20855/ijav.2022.27.41875.
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The characteristics of a drill string system have an essential influence on the performance of directional drilling. The appropriate control method of a drill string is important to drilling efficiency and downhole operation safety. Therefore, based on a new mechanical rotary steerable tool (RST), this paper aims to analyze the Dynamic Characteristics of RST in Directional Drilling. First, considering the thrust force generated by the RST and bottom hole assembly (BHA), the governing vibration equations of a drill string system are established. Furthermore, connected with fields drilling parameters, including the effects of a new RST on a drill bit and wellbore, as the boundary and initial conditions, the dynamic characteristics of a drill string system are compared and studied in directional and straight drilling. The results show that the axial vibration of the drill string increases extremely in directional drilling process, while the weight on bit (WOB) and inclination force change in small range. Moreover, the torque and azimuth force tend to be stable soon, even its initial fluctuations are significantly. Also, the new RST can effectively enhance the steering capacity, increase the drilling efficiency, and improve drill bit force performance. The research results can provide reference for developing directional drilling technologies, including related tool design and optimization.
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Shaikh, Abdul Qadir, Abdul Haque Tunio, Shoaib Riaz, Waseem Arshad, and Habibullah Sargani. "Technical Performance Analysis of RSS and Mud Motors: A Case Study." International Journal of Current Engineering and Technology 10, no. 06 (December 14, 2022): 924–28. http://dx.doi.org/10.14741/ijcet/v.10.6.5.
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As global demand for oil and gas increases, drilling directional and horizontal wells safely, efficiently and economically requires the best in expertise and technology. The drilling strategy required to reach these targets utilizes one of the several available directional drilling techniques which includes the use of Whipstock, Bent Sub, conventional directional Bottom hole assemblies, Rotary steerable system and positive displacement mud motors. Poor well trajectories become the matter of serious worry in deep and deviated sections of the wells with higher dogleg severity, lower ROP, tolls stucking which causes huge economic loss to the operators. In worst case scenarios the in-adequately drilled directional wells are abandoned. The main objective of this research study will be the intermediate drilling section of the well where the steering of the trajectories like directional drilling trajectories i.e. Slant well, S shaped well and Horizontal wells that will be considered for analysis. This study will analyze the performance of RSS and conventional mud motors, on the basis of rate of Penetration (ROP), drilling depth, and borehole quality.
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Vagin, A. V., and A. S. Vorotyntseva. "Radar Method for Obtaining Information from a Horizontal Directional Drilling Device." Journal of the Russian Universities. Radioelectronics 27, no. 1 (March 1, 2024): 90–101. http://dx.doi.org/10.32603/1993-8985-2024-27-1-90-101.
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Introduction. Directional drilling is a conventional method for trenchless installation of underground communications, exploration of solid minerals, and geological exploration. These tasks can be implemented using a directional drilling installation equipped with a high-precision unit for determining the drilling head coordinates to match the current and specified drilling routes. The problem of obtaining precise coordinates (depth, zenith, azimuth) of the drilling head is a priority task in trenchless drilling. We previously considered an acoustic method for monitoring the drilling head position in a directional drilling device. In this work, we consider a radar complex for monitoring the drilling head position from the surface of the earth with fixed transponder beacons. The radar method for obtaining such information allows the drilling process to be optimized by increasing the positioning accuracy, providing for constant automatic position monitoring, as well as reducing the time and financial costs.Aim. To demonstrate the possibility of constructing a radar complex for obtaining information about positioning of the drilling head of a directional drilling installation based on transponder beacons distributed on the surface of the earth.Materials and methods. The study was based on the physical principles used in mobile systems, i.e., determining the location of the probe and its parameters using radio signals emitted by the probe in the frequency range of tens of kHz, to minimize the influence of soil inhomogeneities.Results. The possibility of using the radar method for obtaining the drilling head coordinates when monitoring its position during drilling operations was studied. The operational principle of such a radar complex was considered; the schemes of positioning transponder beacons on the surface of the earth and relative to the drilling head were developed; a technology for supporting drilling operations using this method was described.Conclusion. We propose an approach to determining the drilling head coordinates and their automatic monitoring in real time. The proposed approach to constructing a high-precision radar information transmission complex can be used in the design and modernization of directional drilling equipment.
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He, Jiang Fu, He Liu, Kun Yin, and Xin Gan. "Field Tests on the Application of Oscillation Tool with a Fluidic Amplifier to Directional Well Drilling." Applied Mechanics and Materials 741 (March 2015): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amm.741.599.
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The directional well drilling technology is extensively utilized and developed throughout the world. However, series of drilling problems occurred in the operation process of directional drilling. In order to reduce the friction of drilling tools, an oscillation tool with a fluidic amplifier has been field tested, and the pressure pulse of oscillation tool has been obtained. Field test results have shown that the oscillation tool has an extensive flexibility to directional well drilling, and the oscillation tool could stably actuate the drilling tool to have reciprocating vibration, which contributes to the friction and drag reduction of drilling tools. Furthermore, it can be concluded that the pressure pulse value generated by pumped fluid varies with input flow rate, and the pressure of oscillation tool increases while the flow rate is increasing. In addition, the motion frequency of the oscillation tool is exponentially increasing with the raise of pumped flow rate.
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Williamson, H. S., and H. F. Wilson. "Directional Drilling and Earth Curvature." SPE Drilling & Completion 15, no. 01 (March 1, 2000): 37–43. http://dx.doi.org/10.2118/62114-pa.
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Oganov, G. S., and V. V. Prokhorenko. "METHODS OF DIRECTIONAL WELLS DRILLING." Construction of Oil and Gas Wells on Land and Sea, no. 4 (2019): 9–15. http://dx.doi.org/10.30713/0130-3872-2019-4-9-15.
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Hungerford, Frank, and Ting Ren. "Directional drilling in unstable environments." International Journal of Mining Science and Technology 24, no. 3 (May 2014): 397–402. http://dx.doi.org/10.1016/j.ijmst.2014.03.019.
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Fayaz, B. Antony, Huda Huda, and Asif Ali. "Directional Drilling in L Profile." Biosciences Biotechnology Research Asia 11, SE (October 30, 2014): 221–29. http://dx.doi.org/10.13005/bbra/1414.
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Kramer, Steven R., and Glenn A. Gary. "Directional Drilling Taps the Underground." Opflow 27, no. 3 (March 2001): 1–6. http://dx.doi.org/10.1002/j.1551-8701.2001.tb02300.x.
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Huijun, Duan, Hao Shijun, and Feng Jie. "The Detection Method of Fire Abnormal Based on Directional Drilling in Complex Conditions of Mine." E3S Web of Conferences 38 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20183801007.
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In the light of more and more urgent hidden fire abnormal detection problem in complex conditions of mine, a method which is used directional drilling technology is put forward. The method can avoid the obstacles in mine, and complete the fire abnormal detection. This paper based on analyzing the trajectory control of directional drilling, measurement while drilling and the characteristic of open branch process, the project of the directional drilling is formulated combination with a complex condition mine, and the detection of fire abnormal is implemented. This method can provide technical support for fire prevention, which also can provide a new way for fire anomaly detection in the similar mine.
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Aleksandr, Kuriachii, and Kaliagin Sergei. "Applying modern technologies when drilling directional wells with long horizontal boreholes." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 5 (August 6, 2020): 13–18. http://dx.doi.org/10.21440/0536-1028-2020-5-13-18.
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Introduction. Directional drilling of wells is currently carried out by a rotary steerable system and conventional equipment including a mud motor with an adjustable skew angle. Either of the two methods has particular advantages. Research aim is to analyze the technologies provided by various service companies in the field of directional and horizontal wells drilling in order to provide means of improving the utilization capacity of the conventional bottom hole assembly in long horizontal boreholes. Methodology. When drilling directional wells with a small departure from the vertical and wells with horizontal boreholes up to 500 m long, a preference is given to a mud motor as far as a change in deviation parameters is concerned. This is due to the fact that the mud motor has a significant economic advantage. However, when drilling directional well with complex planned profile or a well with a horizontal borehole of more than 500 m, the mud motor may cause a variety of problems, while a rotary steerable system will allow to avoid some of them. Results. The rotary steerable system is not always economically feasible suggesting a need for an alternative technology with a more advantageous offer on the market of services. A system of pulsed controlled drilling will allow the adjustment of the trajectory of the wellbore when drilling in a rotary mode with conventional equipment for directional drilling, reduce rig time, and improve the borehole quality. Summary. The given technology will make it possible to improve the efficiency of conventional equipment which includes the mud motor for directional wells drilling with complex planned profile and long horizontal boreholes of more than 500 m, as soon as the technology provides the possibility of adjusting the trajectory in a rotary mode. The system of pulsed controlled drilling is developed as an alternative to the rotary steerable system making it possible to significantly reduce construction expenses for wells with complex geological conditions of drilling
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M. Majeed, Majid, and Ayad A. Alhaleem. "Selection of Suitable Drilling Parameters for obtaining high Rate of Penetration in Majnoon Oilfield." Iraqi Journal of Chemical and Petroleum Engineering 20, no. 1 (March 30, 2019): 65–68. http://dx.doi.org/10.31699/ijcpe.2019.1.9.
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Several directional wells have been drilled in Majnoon oilfield at wide variation in drilling time due to different drilling parameters applied for each well. This technical paper shows the importance of proper selection of the bit, Mud type, applied weight on Bit (WOB), Revolution per minute (RPM), and flow rate based on the previous wells drilled. Utilizing the data during drilling each section for directional wells that's significantly could improve drilling efficiency presented at a high rate of penetration (ROP). Based on the extensive study of three directional wells of 35 degree inclination (MJ-51, MJ-52, and MJ-54) found that the applied drilling parameters for MJ-54 and the bit type within associated drilling parameters to drill 36", 24", 16" and 12 1/4" hole sections is the best, although the drilling parameters in 8 1/2" hole section for MJ-51 and selected bit type are the best for future wells.
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Abd Alhaleem, Ayad, Safaa Husain Sahi, and Amel Habeeb Assi. "Bit Performance in Directional Oil Wells." Journal of Engineering 21, no. 11 (November 1, 2015): 80–93. http://dx.doi.org/10.31026/j.eng.2015.11.05.
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This work aims to analyze and study the bit performance in directional oil wells which leads to get experience about the drilled area by monitoring bit performance and analyzing its work. This study is concerned with Rumaila Oil Field by studying directional hole of one oil well with different angles of inclination. Drilling program was used in order to compare with used parameters (WOB, RPM and FR).in those holes. The effect of the drilling hydraulic system on the bit performance was studied as well as the hydraulic calculation can be done by using Excel program. This study suggests method which is used to predict the value of penetration rate by studying different formation type to choose the best drilling parameters to drill each formation. Finally, the main aim of this research is to have the benefit from the past well drilling data to drill new wells without needing new drilling program for each well, also knowing the problems of each formation to avoid them as soon as possible through drilling the new wells, which will improve the bit performance.
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Zhang, Jungang, Guo Chen, Ruitao Liu, Yongping Yang, and Xiang Chen. "Development of Comprehensive Acquisition Software for Measurement While Drilling Data Based on VUE Coal Mine." E3S Web of Conferences 406 (2023): 04038. http://dx.doi.org/10.1051/e3sconf/202340604038.
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For the current coal mine directional drilling MWD equipment and system are independent of each other, resulting in different forms of MWD data at the bottom of the hole, forming data islands; Based on the B/S system architecture mode, by comparing the measurement while drilling mode and measurement data format, the requirement module of data comprehensive acquisition system is analyzed; the background database of the integrated collection system is set up to develop the development of the integrated collection system of directional drilling while drilling data in coal mine. The verification shows that the data acquisition system can meet the unified collection and processing of various MWD data, the overall analysis and evaluation function, and achieve real-time data upload. It provides data network transmission guarantee for directional drilling data supervision platform in coal mine, and improves the intelligent level of coal mine drilling.
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Baksa, Attila, Gábor Ladányi, Sándor Szirbik, and Zoltán Virág. "Fem stress analysis of a barrel reamer." New Trends in Production Engineering 2, no. 1 (October 1, 2019): 178–85. http://dx.doi.org/10.2478/ntpe-2019-0018.
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Abstract Horizontal Directional Drilling (HDD) is a method of installing underground pipelines, cables and service conduit through trenchless methods. The tools and techniques used in the HDD process are an outgrowth of the oil well drilling industry, too. Installation of a pipeline by HDD is a three stages process. The first stage consists of directionally drilling a small diameter pilot hole along a designed directional path. Drilling fluid is pumped through the drill pipe to the drill bit where high pressure jets and the bit will grind the soils ahead of the drill stem. The second stage involves enlarging this pilot hole to a diameter suitable for installation of the pipeline. A reamer is pulled back and rotated while pumping drilling fluid to cut and remove solids to enlarge the hole. A kind of reamer is the subject of this paper. The final stage consists of pulling the pipeline back into the pre-reamed hole. The most important part of the mechanical analysis is to define the boundary conditions for operating situations when the tool is under maximum load. In this paper we present a helpful description for giving boundary conditions to perform the numerical simulation of a barrel reamer.
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Andrade, Caetano P. S., J. Luis Saavedra, Andrzej Tunkiel, and Dan Sui. "Rotary steerable systems: mathematical modeling and their case study." Journal of Petroleum Exploration and Production Technology 11, no. 6 (May 22, 2021): 2743–61. http://dx.doi.org/10.1007/s13202-021-01182-6.
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AbstractDirectional drilling is a common and essential procedure of major extended reach drilling operations. With the development of directional drilling technologies, the percentage of recoverable oil production has increased. However, its challenges, like real-time bit steering, directional drilling tools selection and control, are main barriers leading to low drilling efficiency and high nonproductive time. The fact inspires this study. Our work aims to contribute to the better understanding of directional drilling, more specifically regarding rotary steerable system (RSS) technology. For instance, finding the solutions of the technological challenges involved in RSSs, such as bit steering control, bit position calculation and bit speed estimation, is the main considerations of our study. Classical definitions from fundamental physics including Newton’s third law, beam bending analysis, bit force analysis, rate of penetration (ROP) modeling are employed to estimate bit position and then conduct RSS control to steer the bit accordingly. The results are illustrated in case study with the consideration of the 2D and 3D wellbore scenarios.
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Abd Al-Razzaq, Ayad A. Al-Haleem, Abdul-Aali Dabbaj, and Firas Mohammed Hadi. "Optimization of Hole Cleaning In Iraqi Directional Oil Wells." Journal of Engineering 22, no. 7 (July 1, 2016): 108–17. http://dx.doi.org/10.31026/j.eng.2016.07.07.
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Efficient cuttings transport and hole cleaning are very important factors for obtaining an effective drilling operation. In an inclined and horizontal drilling, hole cleaning issue is a common and complex problem.
The scope of this research is to study the drilling parameters which affect hole cleaning in Iraqi directional wells through studying and analyzing some drilled wells ( vertical , directional (30 degree) , directional (60 degree) and horizontal ).An excel sheet is prepared to calculate carrying capacity index which represents an indicator for good hole cleaning in different sections. The study indicated through the field investigations, practical experiences and theoretical calculations that the most effective drilling parameters for optimum hole cleaning were flow rate, yield point, mud weight, plastic viscosity, rotation of the drill string, and pH.
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Voievidko, I. V., and V. V. Tokaruk. "THE DESIGN OF THE TRAJECTORY OF A SPATIALLY DEVIATED WELL." Prospecting and Development of Oil and Gas Fields, no. 1(70) (March 29, 2019): 52–59. http://dx.doi.org/10.31471/1993-9973-2019-1(70)-52-59.
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Natural spatial deviation is due to the non-conformity of the type of a BHA and geotechnical drilling conditions at a certain interval, as well as mistakes in conducting geological exploration. The article presents the method which benefits the most from the natural deviation and the use of non-directional bottom hole assemblies. The main idea of this method lies in the fact that the design of the well trajectory is directed from the center of the target area to the wellhead. The article describes the main sections which constitute the trajectory of a spatially deviated well including the section of big diameter in the upper intervals. The input data necessary for designing the profile are given. The authors present the method of calculating the drilling lot using non-directional BHAs. The method consists of several cyclic repetitive operations and each subsequent interval of the wellbore is designed taking into account the change of the inclination and azimuthal angles in the previous interval. The authors conduct the survey of devices for drilling the borehole section which is made using a directional BHA. In rotor drilling, the technical devices and directional drilling technology are quite complex, therefore whipstocks with mud motors are used more often. As a result of calculating the trajectory of the well with different transition points between directional andnon-directional BHAs on the axis parallel to the azimuth direction, an array of transition points from two-axis to single-axis directional BHAs is formed. When drawing these points on the well plan, the ellipse of intermediate depths of BHA change is formed. This ellipse makes it possible to choose the optimal two-axis BHA using the necessary inclination angle values at the final stage of drilling a big diameter wellbore and using the final depth of this interval. On the basis of the this method the authors create software that allows automating the process of designing the well trajectory, taking into account the change of geology in the log, technical parameters of wells construction and technological parameters of drilling. This software was used while designing a well trajectory, referring to certain geological drilling conditions.
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Loreto, Julio, Brad Zukiwsky, Aly Bassiouny, and Onochie Michael Okorie. "Case Study: Hitting the Bullseye: The Evolution of RSS and LWD Technology in Horizontal Wells." Journal of Petroleum Technology 74, no. 12 (December 1, 2022): 38–41. http://dx.doi.org/10.2118/1222-0038-jpt.
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_ For nearly a century, conventional directional drilling served as the benchmark for drilling nonvertical wellbores. It enabled operators to access multiple parts of a reservoir from a single surface location, reducing the overall environmental impacts. Traditional directional drilling used some type of nonrotating bent sub to tilt the drill bit in a different direction from the central axis. But with the demands of the modern energy industry driven by the unconventional horizonal well market, the industry needed a step change. Operators required a system that could precisely steer through extended-reach wells, often traversing complex trajectories, with precision control and greater reliability. The evolution of rotary steerable systems (RSS) and logging-while-drilling (LWD) technology in the early 2000s addressed this demand by deploying fit-for-purpose tools and services to improve the economic viability of oil and gas fields around the world. High-Performance Drilling With Full Directional Control With more operators needing an RSS system that could drill through longer horizontals and deliver quality wellbores in as few runs as possible, Weatherford recognized the demand and responded with the Magnus RSS. Using a push-the-bit design, the system combines reliable, high-performance drilling with precise directional control to enable operators to extend the performance of each drilling run, providing faster drilling, better wellbore quality, and high-quality measurements. Directional drilling requires tools to stay in the wellbore for extended periods of time. To keep costs as low as possible, the optimal solution is to perform all drilling operations in one run. To account for the downhole stresses, a rugged design was developed for the RSS. A streamlined design, featuring a ¼-in. undergauge stabilizer and 20% junk-slot area, a fully rotating bias unit, minimal bottomhole assembly (BHA) stabilization, and an optimized junk-slot area combine to reduce the risk of expensive stuck-pipe events. The system also incorporates metal-on-metal piston seals in the mud-actuated pad, enhancing mechanical integrity in harsh and high-pressure drilling environments and greater overall system reliability. Operators also need the ability to precisely steer the bit to stay on the well plan no matter if the plan requires verticals, curves, or laterals. Three independent pads and valves provide proportional control and allow the pads to fully retract for reaming, cement/shoe drilling, or tight-hole applications. This independence also provides redundancy in the system in the event of pad or valve failure. The three pads actively manage the direction through the entire wellbore and achieve a true-inclination hold in the lateral. In many conventional directional drilling operations, even a successful run can leave the wellbore in need of underreaming to prepare it for the installation of contingency liners and casing or completions equipment. Ideally, to optimize drilling efficiency, the directional drilling and underreaming should be performed in the same run. To meet operators’ desire for hole enlargement while drilling, our engineers developed the RipTide drilling reamer, which is often coupled with the Magnus RSS, to drill a smooth, concentric underreamed hole to total depth in one trip.
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Gutierrez, David. "Case Study: Space-Age Directional Drilling Improves Efficiency, Economics." Journal of Petroleum Technology 74, no. 05 (May 1, 2022): 48–51. http://dx.doi.org/10.2118/0522-0048-jpt.
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Directional drilling has been used in oil and gas operations since the 1930s when onshore drillers employed the technology to reach offshore reservoirs. Over the years, technologies have been introduced to improve precision and control and at the same time have allowed multiple reservoirs to be produced through a single well, which reduces drilling costs and minimizes the environmental impact of the drilling process. In designing drilling plans, operators have considered economics when deciding whether to employ the traditional process of rotating the drillstring to control well trajectory or use more precise directional drilling techniques, but an either/or approach is not always the best one. The introduction of software that analyzes drilling conditions and determines the most appropriate drilling solution is changing the status quo, streamlining the drilling process and changing the playing field for drillers. The Evolution of Directional Drilling The widespread adoption of horizontal drilling from narrowly spaced slots on a centralized pad location has led to the introduction of complex wellbore geometry intended to maximize field development while minimizing geographical footprint. The growing need for precise execution of complicated well trajectories increased the demand for directional drilling expertise. Using a steerable bottomhole assembly (BHA) comprising a mud motor with a bent housing, an experienced directional driller can orient the bend of the motor in the direction prescribed on the well plan to steer the well on the intended trajectory in a process known as sliding. When the well trajectory is intended to remain relatively straight, the entire drillstring is rotated from surface in a process referred to as rotating. Experience and research have shown, however, that the well trajectory is rarely straight during periods of rotation due to rotational tendencies, a combination of systematic and random influences from BHA design, drilling parameters, and geological formation characteristics that can cause a significant divergence from plan. Rotational tendencies, along with designed well plan deviations, often require sliding to ensure the well follows the planned trajectory. All else being equal, it might seem that sliding should be applied across the board, but there are two reasons that sliding is not the default solution.
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Kuznetsov, V. G., E. G. Grechin, D. A. Nikiforov, and E. N. Savin. "ASPECTS OF OPTIMIZATION OF DRILLING DIRECTIONAL WELLS." Oil and Gas Studies, no. 3 (July 1, 2017): 61–65. http://dx.doi.org/10.31660/0445-0108-2017-3-61-65.
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Analysis of the Russian and foreign expertisein optimizing the drilling process suggeststhe need to develop new methods for solving the problems associated with the process of drilling directional wells, in order to prevent possible complications and on their basis solvethe optimization problems in the field of drilling, which seems a relevant scientific and practical task.
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Lueke, Jason S., and Samuel T. Ariaratnam. "Experimental procedure for evaluating ground displacement factors in directional drilling." Canadian Journal of Civil Engineering 30, no. 5 (October 1, 2003): 830–40. http://dx.doi.org/10.1139/l03-038.
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As the utilization of horizontal directional drilling increases in urban areas, damage resulting from surface heave during pullback is becoming a greater concern for municipalities, regulatory agencies, and contractors alike. The magnitude and extent of surface deformations are influenced by several factors, including borehole pressure, depth of cover, soil density, backream rate, soil composition, annular space, and reamer type and diameter. With any complex system, understanding how these factors relate to each other in the development of surface deformations is beneficial in the planning of future installations. This paper outlines work towards the development of a model to understand how these factors contribute to surface heave during the backream phase of a horizontal, directionally drilled installation. Initial identification and selection of factors to be used are facilitated through the analytical hierarchy procedure (AHP). Using the ranking identified by the AHP, a full factorial experiment was designed and implemented in field conditions, with ground movements measured at various stages along four uniquely designed borepaths. With a better understanding of the factors associated with directionally drilled installations, contractors and engineers may better select tooling and techniques to minimize the magnitude and extent of surface heave.Key words: horizontal directional drilling, analytical hierarchy procedure, data collection, modeling, experimental design, surface heave, trenchless technology.
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Kumar, Mohit. "APPLICATIONS, DESIGN, AND KEY SUCCESS FACTORS FOR MOTORIZED ROTARY STEERABLE SYSTEM." International Journal of Advanced Research 11, no. 08 (August 31, 2023): 878–83. http://dx.doi.org/10.21474/ijar01/17465.
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Drilling oil and gas well is always a costly affair, and there has been a continuous push to reduce the cost by improving the well construction rate. In early times, well used to be vertical. When the need to drill directional wells arose, technology such as positive displacement motors with bent housing and rotary steerable systems (RSS) wereintroduced and drilled several directional wells. But both these technologies have some drawbacks. To perform directional work in the well with the Motor, sliding needs to be done which can cause a risk of stuck pipe. A Rotary steerable system (RSS) resolves the stuck pipe event to a great extent since directional work can be done in rotation mode. But the RPM available at the bit is only surface RPM (SRPM). To Counter this problem, the industry has developed the latest drilling technology that has the best of both technologies. The BHA consists of a Motor and an RSS. The motor provides extra RPM at bit and RSS does the directional work without any need for sliding. This technology has revolutionized the drilling envelope. These days Motorized RSS (MRSS) BHA has become a go-to BHA when a drilling engineer wants to achieve difficult well trajectories with drilling efficiencies. This paper discusses the various applications of this BHA along with Design and key success factors.
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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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Litvinenko, V., and M. Dvoinikov. "Methodology for determining the parameters of drilling mode for directional straight sections of well using screw downhole motors." Journal of Mining Institute 241 (February 25, 2020): 105. http://dx.doi.org/10.31897/pmi.2020.1.105.
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Article presents results of study on possibility of increasing the efficiency of drilling directional straight sections of wells using screw downhole motors (SDM) with a combined method of drilling with rotation of drilling string (DS). Goal is to ensure steady-state operation of SDM with simultaneous rotation of DS by reducing the amplitude of oscillations with adjusting the parameters of drilling mode on the basis of mathematical modeling for SDM – DS system.Results of experimental study on determination of extrema distribution of lateral and axial oscillations of SDM frame depending on geometrical parameters of gerotor mechanism and modes ensuring stable operation are presented.Approaches to development of a mathematical model and methodology are conceptually outlined that allow determining the range of self-oscillations for SDM – DS system and boundaries of rotational and translational wave perturbations for a heterogeneous rod with an installed SDM at drilling directional straight sections of well. This mathematical model of SDM – DS system's dynamics makes it possible to predict optimal parameters of directional drilling mode that ensure stable operation of borehole assembly.
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Xia, Hui, Yi Hua Dou, Xin He Wang, and Jiang Wen Xu. "Sectionalized Mechanical Models of Drilling Tool of Trenchless Directional Drilling." Applied Mechanics and Materials 268-270 (December 2012): 1190–93. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1190.
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There are three working conditions namely drilling a guide hole, expanding the guide hole and pulling back pipeline in trenchless directional drilling. The position of drill string in the wellbore and loads exerted on the drill string varied in different working conditions. The models of buckling analysis of drill strings under compression, mechanical analysis of drill string under axial compression near drill bit in inclined straight section, mechanical analysis of drill string with multi-centralizers under axial compression near drill bit in inclined straight section, mechanical analysis of drill string near drill bit under axial compression in horizontal section, mechanical analysis of drill string near drill bit under axial tension in horizontal section, mechanical analysis of drill strings near drill bit under axial tension in inclined straight section and mechanical analysis of drill string in failed well are established based on the characteristic of loads and trajectories in each section. The establishment of sectionalized mechanical model of drilling tool is the fundament of further study of force analysis, deformation analysis and stress analysis.
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Zimmer, Chad, Dean Richter, John Person, Jim Tilley, and Michael Bittar. "Drilling a Better Pair: New Technologies in SAGD Directional Drilling." Journal of Canadian Petroleum Technology 51, no. 02 (March 1, 2012): 115–26. http://dx.doi.org/10.2118/137137-pa.
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Yelena Shmoncheva, Farid Hamzayev, Yelena Shmoncheva, Farid Hamzayev, and Soltan Agayev Soltan Agayev. "RESEARCH INNOVATIONS IN DIRECTIONAL AND HORIZONTAL DRILLING AND SIDETRACKING TECHNIQUES." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 41, no. 06 (May 14, 2024): 399–408. http://dx.doi.org/10.36962/pahtei41062024-43.
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Directional and horizontal drilling, and sidetracking techniques have become integral components of the oil and gas industry, which allows access to hydrocarbon reserves in challenging environments. This paper provides an overview of these drilling methods and explores recent trends in the development of technical equipment for horizontal drilling and sidetracking. Directional drilling allows for drilling at various angles, including horizontal and multilateral, providing access to reservoirs beneath the Earth's surface. This technique involves specialized equipment and precise control of the drill bit's direction and deviation, resulting in better reservoir management, increased productivity and reduced environmental effect. Horizontal drilling, on the other hand, involves drilling laterally through subsurface rock formations, particularly beneficial for accessing unconventional reservoirs (shale formations). Horizontal drilling allows operators to access more of the formation, resulting in increased productivity and reduced environmental footprint. Sidetracking techniques are employed to redirect the path of a wellbore, necessary for avoiding geological hazards, accessing untapped reservoirs, or bypassing damaged sections of the well. This process requires careful planning, specialized equipment, and skilled personnel to ensure successful execution while minimizing risks. The paper also discusses modern trends in the development of technical equipment for horizontal drilling and sidetracking technology. These include automation and robotics to improve drilling efficiency and safety, advancements in drilling fluids and measurement-while-drilling (MWD) technologies for better wellbore stability and real-time data acquisition, and innovations in extended reach drilling (ERD) tools and casing and cementing solutions. Additionally, there is ongoing development in sidetracking techniques to improve efficiency and reliability, such as whipstock and casing exit technologies. The Ultrashort-Radius Radial System (URRS) is highlighted as an advanced drilling technology, enabling access to reservoirs with restricted space or challenging geometries. Although challenges such as cost and adaptation to downhole conditions remain, ongoing research and development is aimed at overcoming these barriers and demonstrating the feasibility of innovative drilling technologies. Ultimately, these advances contribute to the industry's goal of maximizing hydrocarbon production while ensuring operational efficiency and environmental sustainability. Keywords: directional drilling, horizontal drilling, sidetracking techniques, technical equipment development, ultrashort-radius radial system, laser drilling.
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Denney, Dennis. "Integrated Formation Evaluation and Directional Drilling." Journal of Petroleum Technology 52, no. 11 (November 1, 2000): 25–36. http://dx.doi.org/10.2118/1100-0025-jpt.
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TERVYDIS, Paulius, and Ruta JANKUNIENE. "Horizontal directional drilling pilot bore simulation." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 25 (2017): 3421–34. http://dx.doi.org/10.3906/elk-1606-200.
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Wang, Bo. "Improvement and Application of Directional Reaming While Willing Bit in Tahe Oilfield." International Journal of Energy 4, no. 2 (March 27, 2024): 31–35. http://dx.doi.org/10.54097/f1njnc22.
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Unlike conventional sidetracking technology, the technology of reaming while directional drilling makes it possible for us to conduct directional drilling and reaming simultaneously using dual core bit, which simplifies the construction steps and can greatly shorten the drilling cycle and reduce drilling costs. With the increasing of the tasks of sidetrack horizontal well in the old wells of Tahe Oilfield, the technology of reaming while directional drilling has become an important means for sidetrack of old wells in Tahe Oilfield. However the substratum of Bachu formation has high content of gravel with large diameter and strong consolidation, which cause severe abrasion of dual core bit, short drill life and low ROP. With the problems in the substratum of Bachu Formation, Tahe Oilfield continuously improves dual core bit based on its effect of reaming while drilling, and breaks the national records of the maxim setting depth, inclination and continuous expansion length during the operations of well TH12124CH. This paper shows the improvements of dual core bit and its application effect both in well TH10233CH and well TH12124CH, and put forward a further scheme to improve the dual core bit for the substratum of Bachu Formation of Tahe Oilfield.
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Chudyk, I. I., A. M. Livinskyi, Akhmed Al Tanakchi, and A. M. Pastuch. "THE APPLICATION FEATURES OF DIRECTIONAL BHAS WHILE DRILLING DIRECTIONAL WELLS." Prospecting and Development of Oil and Gas Fields, no. 1(70) (March 29, 2019): 17–24. http://dx.doi.org/10.31471/1993-9973-2019-1(70)-17-24.
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The article presents a scientific and practical approach to assessing the energy efficiency of directional bottom hole assembly on the basis of the mud motor. The main design feature of these assemblies is the presence of a bent angle in the spindle section of the mud motor. The conditions of operation of such assemblies are considered for a combined drilling method with a various number of stabilizers. Particular attention is paid to determining the causes of unproductive energy costs on the work of the directional bottomhole assemblies in the borehole.The mathematical model improved by the authors includes the geometric features of the assembly design, the bent angle of the spindle of the mud motor as to its body, the number of the stabilizers and the location of their installation, the borehole inclination angle, the physical and mechanical characteristics of the subsurface rock that forms it. The authors calculated the energy consumption for rotation and the axial displacement of the assemblies in the directional well taking into account the deflection forces on the bit and the reaction on the stabilizers. The researchers suggest the use of the indicator of specific energy costs to overcome the forces and moments of the environment resistance during the work of the directional assemblies using the method of combined drilling.Using the results of analytical research and the developed approach the authors study energy costs for thework of the directional bottom hole assemblies with a various number of the stabilizers. The study is conducted for the slick assemblies, as well as for assemblies with one- and two-stabilizers. It is established that directional assemblies with one stabilizer are characterized by the highest values of the forces of resistance of axial displacement and rotation in the directional well. As they are high-torque, energy-consuming and the most energy-intensive systems, their practical use is limited. The main factors in the formation of energy costs for the work of directional assemblies while applying the combined drilling method are the number of the stabilizers and the inclination range.
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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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Alexey, Neroslov. "The Method of Cluster Drilling in the Western Ural as the Beginning of the Technical and Economic Revolution in the World Drilling." TECHNOLOGOS, no. 3 (2020): 47–57. http://dx.doi.org/10.15593/perm.kipf/2020.3.03.
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In 1943, at the height of the Great Patriotic War, the new revolutionary drilling technique with high efficiency was used in Krasnokamsk oilfield of Molotov (Perm) Oblast for the first time in the world – the cluster turbodrilling method. The development of oil industry in Prikamye in the 1940s was associated with certain complications. The main deposits of the Krasnokasmk oilfield discovered before the war turned out to be located due to a number of reasons within the area of industrial and residential construction of the city of Krasnokamsk and under the Kama river and the Paltinskoye swamp close to the city. Conventional drilling methods could not be used for their development. The way out was to use the method of directional drilling that was little known at that moment. The development of the innovative technology in Krasnokamsk oilfield in 1942 was largely due to the involvement of the specialists of the Experimental Turbodrilling Bureau evacuated from Baku. Directional drilling which involved the deviation of the bottom hole (the ultimate lowest point of the well) from the wellhead (the initial uppermost location) by several hundred metres opened up broad opportunities for developing hard-to-recover oil deposits while significantly accelerating and ensuring cost savings of the drilling process. The directional drilling served as the basis for the development in Prikamye of an advanced technology of cluster drilling when several directional wells with different azimuths were drilled from a small well pad. In 1943–1944, cluster drilling was tested and successfully used in Krasnokamsk oilfield. The cluster drilling comprised an entire range of innovative solutions including the movement of assembled drilling rigs without dismantling power equipment. Also, it resulted in the reduction of total labour costs, scope of construction and assembly works, costs of building oilfield roads, power lines and pipelines, and transportation costs. People’s Commissariat of Oil Industry of the USSR initiated a large-scale rollout of the advanced method of cluster drilling in the largest oil-producing regions of the Soviet Union – Azerbaijan and the North Caucasus, and the area of the “second Baku” – Bashkiria, Tatary, and Kuybyshev oblast. The transition to the advanced and cost-saving technology of cluster drilling laid the foundation for the technical and economic revolution of the world drilling practices.