An Improved Model to Calculate Pullback Force of Trenchless Horizontal Directional Drilling Pipeline by Xiao-qiang Liang, Da Hu, Yong-suo Li, Xian Yang, Lei Jiang, Yun-yi Zhang

“…In the pullback operation of horizontal directional drilling pipeline crossing, the existing calculation and prediction models of pullback force are relatively simple. …”
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Lightweight Design and Dynamics Analysis of ZYL-15000D Directional Drill Reducer by Xiaohong Zhao, Xianguo Yan, Zhi Chen, Hang Su

“…Since the output torque of the rotary reducer of the ZYL-15000D-kilometer directional drill is proportional to the gear train transmission ratio, the output torque is large enough when the input speed and output speed meet the design goal. …”
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Assessment of the Weimer Geomagnetic Perturbation Model for High‐Latitude Positioning and Navigation by S. Califf, M. Nair, D. Weimer, N. Zachman, B. Poedjono

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Study of drilling muds on the anti-erosion property of a fluidic amplifier in directional drilling by Jiang-fu He, Peng-yu Zhang, Qi-lei Yin, Kun Yin, Hou-ping Liu

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Study of drilling muds on the anti-erosion property of a fluidic amplifier in directional drilling by Jiang-fu He, Peng-yu Zhang, Qi-lei Yin, Kun Yin, Hou-ping Liu

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Analysis of the Influence of Whipstock Point Position of Directional Drilling through Embankment on the Stability of Embankment Slope against Sliding by Jinhuang Yu, Jinjie Liu, Zhenzhen Jiang, Xiaofang Kang

“…With the increasing number of river-crossing pipeline projects, many studies have focused on the safety and stability of embankment slopes in horizontal directional drilling crossing embankment construction. In addition, it is challenging to study the influence of key processes in directional drilling construction on the antisliding stability of embankment slopes. …”
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Numerical simulation analysis of effect of borehole gas extraction under fluid‐structure interaction by Lin Wang, Ziyao Yang, Xiangjun Chen, Shuailong Feng

Subjects: “…directional drilling…”
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Experimental Study on the Flow Behavior of Grout Used in Horizontal Directional Drilling Borehole Grouting to Seal Mining-Induced Overburden Fractures by Jinfeng Ju, Jialin Xu, Jing Yang

“…A ground-based engineering test was conducted at the Gaojiabao coal mine that utilized horizontal directional drilling (HDD) to grout and seal water-conducting overburden fractures. …”
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A Proper Use of the Adjacent Land‐Based Observatory Magnetic Field Data to Account for the Geomagnetic Disturbances During Offshore Directional Drilling by Mikhail Kruglyakov, Alexey Kuvshinov, Manoj Nair

“…Abstract Directional drilling in the oil fields relies particularly on the “on‐fly” measurements of the natural magnetic field (measurements while drilling; MWD); the MWD are eventually used to construct the well path. …”
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Reasonable Scope of Kilometer Drilling in Lower Layer of Extrathick Coal Seam: A Case Study of Tingnan Coal Mine, China by Delong Zou, Xiang Zhang

“…According to the plastic deformation of the lower layer under different vertical depths and the movement of coal and rock mass, it is determined that the reasonable range of kilometer directional drilling in the lower layer is 6–9 m below the floor vertical depth. …”
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DYNAMIC ANALYSIS AND SIMULATION OF FULL ROTARY BUILT-IN STEERING DRILLING TOOLS by ZHANG GuangWei, QIAO Yang, TIAN Fan, GAO SiTu, YIN FuLai

“…The full-rotation built-in steerable drilling tool is one of the important components of the rotary steerable drilling system.It is a new type of dynamic directional downhole closed-loop rotary steerable drilling tool.In order to study the motion condition of the full-rotation built-in rotary steerable drilling tool,based on the principle of space mechanism,The dynamics concentration parameter model of the full-rotation built-in directional drilling tool was established,and the system dynamics analysis was carried out.The correctness of the model was verified by ADAMS simulation.The results show that the basic parameters of velocity and attitude of the eccentric ring and the guide shaft of the key components are theoretically obtained,and the motion characteristics of the attitude mechanism are revealed.The rotational speed,eccentricity and bit motion of the eccentric ring and the guide shaft are studied.The relationship is obtained,and the variation of each parameter in the guiding system with time is obtained.It lays a theoretical foundation for the research of the full-rotation built-in directional drilling tool and the realization of the optimal design of the drilling system.…”
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Effect of Stiffness of Bearings and Gearbox Housing on the Dynamic characteristic of Drive System by Xu Liang, Shi Chunbao, Long Wei

“…The dynamic characteristic simulation analysis model of a directional drilling machine power head gearbox for different levels of complex is established based on the detailed introduction of the modeling method of main components in gearbox,the influence of the stiffness of bearings and housing on dynamic characteristic of gear drive system is discussed. …”
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Fast forward modeling and response analysis of extra-deep azimuthal resistivity measurements in complex model by Pan Zhang, Shaogui Deng, Xiyong Yuan, Fen Liu, Weibiao Xie

“…The Extra-Deep Azimuthal Resistivity Measurements (EDARM) tool, as an emerging technology, can effectively identify geological interfaces within a range of several tens of meters around the borehole, providing geological structures for directional drilling, and effectively improving reservoir encounter rates and enhancing oil and gas recovery rates. …”
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Working Load Characteristics of the PDC-Cone Composite Bit under Impact and Scraping by Kuilin Huang, Chunxiao Zhou, Yingxin Yang, Haitao Ren, Qingzhi Niu

“…It can achieve good results, breaking rock in directional drilling, drilling in inhomogeneous formations, and drilling in formations with high levels of hardness, and it can achieve the engineering goals of increasing speed and efficiency. …”
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Research on spatial prediction technology for mitigating tunnel inrush disasters under complex geological conditions in China’s Hengduan Mountain Range by Yang Zou, XiuJun Dong, Tao Feng, ZhengXuan Xu, Hailin He, ZhangLei Wu

“…In order to achieve the above goals, through extensive exploratory attempts and experiments, it has been found that the use of multi-source information during the survey period can analyze the sources and channels of tunnel water inrushing, as well as the mechanism of water inrushing disasters; By utilizing high-definition images of the excavation surface, ultra deep directional drilling information data, and geophysical 3D attribute information data obtained during tunnel excavation, modeling, coordinate conversion, and 3D integration can be carried out. …”
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Risk Assessments of Water Inrush from Coal Seam Floor during Deep Mining Using a Data Fusion Approach Based on Grey System Theory by Yaru Guo, Shuning Dong, Yonghong Hao, Zaibin Liu, Tian-Chyi Jim Yeh, Wenke Wang, Yaoquan Gao, Pei Li, Ming Zhang

“…For the safety of coal mining, horizontal directional drilling and grouting techniques have been implemented to detect and plug the fractures and conduits that deliver high-pressure groundwater to coal mine. …”
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Evolution Characteristics of a High-Level Asymmetric Fracture-Seepage Community and Precise Coalbed Methane Drainage Technology during Mining of Outburst-Prone Coal Seam Groups by Hongbing Wang, Zhiheng Cheng, Tie Li, Liang Chen, Quanle Zou, Shengli Yang, Jialin Cao

“…On this basis, evolution laws of an asymmetric fracture-seepage community in overlying strata in outburst-prone coal seam groups were obtained, thus optimizing design parameters for directional drilling in the fracture zone in overlying strata. …”
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