Results 1 to 10 of about 3,250 (117)

Borehole stability in naturally fractured rocks with drilling mud intrusion and associated fracture strength weakening: A coupled DFN-DEM approach

Journal of Rock Mechanics and Geotechnical Engineering
Borehole instability in naturally fractured rocks poses significant challenges to drilling. Drilling mud invades the surrounding formations through natural fractures under the difference between the wellbore pressure (Pw) and pore pressure (Pp) during ...
Yaoran Wei, Yongcun Feng, Zhenlai Tan, Tianyu Yang, Xiaorong Li, Zhiyue Dai, Jingen Deng   +6 more
doaj   +3 more sources

A prediction of borehole stability while drilling preliminary prospecting wells based on seismic impedance

Petroleum Exploration and Development, 2015
When the conventional method of predicting borehole stability is applied to the preliminary prospecting wells, the precision of prediction is often affected severely by the lack of data, limit of applying conditions, error of calculated parameters and ...
Chao WU, Jianhua LIU, Dongqing ZHANG, Xiaofeng CHEN, Weijie ZHAO   +4 more
doaj   +3 more sources

Study on static expansive fracturing for pressure relief and rockburst prevention in coal seam boreholes [PDF]

Scientific Reports
Addressing the insufficient pressure relief in the deep coal mass and the deterioration of the surrounding rock bearing structure due to increased borehole diameter in conventional borehole pressure relief techniques, a static expansive fracturing method
Wenyu Lyu, Xinxin Zhou, Zhenhua Ouyang, Yongping Wu, Panshi Xie, Ru You, Haiyang Yi, Jian Liu, Ningbo Zhang   +8 more
doaj   +2 more sources

Research on Evolution Characteristics of Shale Crack Based on Simultaneous Monitoring of Multi-Parameters

Applied Sciences, 2022
Meso-crack evolution mechanism of shale is a key factor affecting the mechanical properties of shale. In order to explore evolution laws of cracks in shale during loading, a meso-crack monitoring system, loading test equipment and an automatic ultrasonic
Qiao Chen, Fenglin Xu, Pengcheng Su, Honglin Zhu, Yifang Zhang, Yang Liu, Dongming Jia, Xiaozai Guo, Jilong Chen, Dunlong Liu   +9 more
doaj   +1 more source

Analytical and Numerical Estimation of Fracture Initiation and Propagation Regions around Large-Diameter, Deep Boreholes for Disposal of Long-Lived Intermediate-Level Waste

Energies, 2022
The safety of high-level radioactive waste disposal has been studied across the world considering mined geologic repositories. Here, we introduce large-diameter, deep borehole disposal as one of the potential solutions for small volumes of long-lived ...
Jingyu Shi, Baotang Shen, Manoj Khanal, Dirk Mallants   +3 more
doaj   +1 more source

Low speed grinding and hang sidetracking branch technology for near horizontal directional hole in coal mine

Meikuang Anquan, 2022
The branch hole is the key to ensure the long-distance drilling of directional hole along the target stratum, improve the coverage of directional drilling and accurately explore geological abnormal bodies.
FANG Jun
doaj   +1 more source

Study on the influence of drilling fluid filtration on stability of coalbed wellbore

Meikuang Anquan, 2021
Coal rock has many porous characteristics, such as cleavage, pore and so on. Drilling fluid is easy to invade into coal bed rock, which is easy to cause wellbore instability.
ZHANG Yi, CHEN Dong, ZHANG Hui, LIU Mengmeng, LIU Fu, WEI Kai
doaj   +1 more source

Coordinated control technology for anti-impact pressure relief of mining roadway and large deformation of surrounding rock

Meikuang Anquan, 2023
The mining roadway under complex conditions was taken as the project background in No.3305 working face of Yiqiao Coal Mine, and the research on the coordinated control was carried out for anti-impact pressure relief and surrounding rock deformation on ...
GU Shitan, CHEN Changpeng, HAN Chuanlei, RONG Weitao
doaj   +1 more source

Stability Analysis in Determining Safety Drilling Fluid Pressure Windows in Ice Drilling Boreholes

Energies, 2018
Borehole stability analysis has been well studied in oil and gas exploration when drilling through rock formations. However, a related analysis of ice borehole stability has never been conducted.
Han Zhang, Dongbin Pan, Lianghao Zhai, Ying Zhang, Chen Chen   +4 more
doaj   +1 more source

Numerical Simulation on Borehole Instability Based on Disturbance State Concept

Energies, 2022
This paper carries out a study on the numerical simulation of borehole instability based on the disturbance state concept. By introducing the disturbance damage factor into the classical Mohr–Coulomb yield criterio, we establish a finite element hydro ...
Daobing Wang, Zhan Qu, Zongxiao Ren, Qinglin Shan, Bo Yu, Yanjun Zhang, Wei Zhang   +6 more
doaj   +1 more source