The influence of temperature, seepage and stress on the area and category of wellbore instability by Xiaobo Liu, Jinyou Zhang, Hongge Jia, Tong Zhang, Xuejia Du, Zhongmin Wang

“…Abstract This study investigates the challenge of borehole instability in shale gas development, focusing on the interactions among temperature, fluid flow, and stress. …”
Get full text

Study on Prediction of Outburst Risk of Excavation Face by Initial Gas Emission by Lu Gao, Xiangtao Kang, Meng Tang, Jinguo Hu, Jiachi Ren, Cunliu Zhou

“…The initial gas flow increases as the borehole depth increases, and it tends to be stable in the later stage. …”
Get full text

Investigation of the Ultrasonic Stimulation Performance on Permeability Enhancement in Coal Seam: Field Tests and In Situ Permeability Evaluation by Jinbiao Fei, Peng Liu, LongKang Wang, Fangxiang Zhong, Chenglong Xie, Yongdong Jiang, Quangui Li, Mingyang Liu

“…The result shows that, within 40 days’ drainage after ultrasonic antireflection in coal seam, the average gas concentration of single borehole in the experimental group increased by 81.4 %~227.3% than that in control group, the average borehole gas flowrate has a 20%~106% improvement over the control group, and the pure methane production in single borehole increased by about 3.83 times. …”
Get full text

Experimental Research on Key Factors Influencing the Expansion Performance of New Type Sealing Materials by Yaobin Li, Xin Guo, Sheng Xue, Chun-Shan Zheng, Maoliang Shen, Yang Xu

“…According to the scanning electron microscopy analysis of new borehole sealing materials, the surface of the new borehole sealing material shows no holes and possesses compactness; and a large amount of ettringite is formed on the surface of the hydration product of hardened cement slurry. …”
Get full text

Application of Distributed Optical Fiber Technology for Coal Bump Prevention by Han Liang, Jun Han, Zuoqing Bi

“…The deformational behaviour of the pressure relief borehole is studied using distributed optical fiber sensing technology. …”
Get full text

Theoretical basis for quantitative evaluation of the expansion of the leading hole of a crushed stone bored pile in a nonlinear setting by A. Z. Ter-Martirosyan, Tran Manh Thiem

“…The expressions are obtained to determine the radial displacement of the borehole wall, radial and tangential stresses in the soil cylinder. …”
Get full text

A Method and Equipment for Continuously Testing the Permeability Coefficient of Rock and Soil Layers by Wei Chen, Datian Cui, Meng Xu, Rongchao Xu

“…For the water pressure test, the current meter will be lifted uniformly from the bottom of the borehole test section to the top of the borehole test section, and the flow rate of the differential section will be continuously detected. …”
Get full text

Speculum Observation and Trajectory Measurement in Gas Extraction Drilling: A Case Study of Changling Coal Mine by Enbiao Zhao, Kangnan Li, Xin Yang, Nan Deng

“…It is found that the hole collapses at the position of about 20 m in both adjacent strata and high-level boreholes, and there are a lot of cracks in the high-level boreholes before 12 m. …”
Get full text

Fine design modeling technology and intelligent implementation of through-layer drilling by Pei QIN, Changbao LIAN, Xiyuan LI, Juzheng SUN, Yuanmin LUO

“…The computer modeling technology is used to carry out the fine checking calculation of the borehole, and the development of the fine intelligent design system for the borehole distribution design of the coal seam gas pre-pumping in the bottom layer of the coal mine is completed. …”
Get full text

The Hydrogeochemical Stratigraphy of Brines and Its Implications on Water Management in the Central Jordan-Dead Sea Rift Valley, Israel by Eliahu Rosenthal, Peter Möller, Orna Buch-Leviatan, Moshe Politi

“…The exploratory borehole Megiddo-Jezre’el 1 (MJ1) was drilled in Israel, in the Bet She’an Valley which branches out from the Central Jordan Rift. …”
Get full text

A Static Fracturing Technology to Enhance the Permeability of Coalbed: Mechanical Study by Long Wang, Baohua Guo, Zhaofeng Wang

“…The mechanical model of borehole fracturing is established to clarify the associated mechanisms for fracturing stimulation based on the elastic-plastic mechanics. …”
Get full text

Vs30 Estimate for Southwest China by Yan Yu, Walter J. Silva, Bob Darragh, Xiaojun Li

“…Several methods were used to estimate Vs30 from site profiles with borehole depths of about 20 m for the strong-motion stations located in Southwest China. …”
Get full text

Experimental Study of Slurry Flow in Mining-Induced Fractures during Longwall Overburden Grout Injection by Dayang Xuan, Jian Li, Kaidan Zheng, Jialin Xu

“…Although the pressure curves at different locations exhibited similar trends, their values did not decrease as the distance from the borehole center decreased during observations. Bleeding and consolidation occurred in the slurry as soon as it flowed out of the borehole to the fracture, and the degree of consolidation increased as a function of the distance from the injection borehole. …”
Get full text

Study on the Method of Automatically Drawing Multiscale Engineering Geotechnical (Geological) Sections Step by Step of Engineering Layers including Lenses by Guangjun Ji, Nannan Zhao, Xiaoyuan Zhou, Qian Wang, Yan Lu, Zizhao Cai

“…A method, taking the engineering strata in Quaternary loose sedimentary as the research object, was proposed to automatically draw multiscale engineering geological sections of engineering layers including lenses and strata pinch-out based on the investigation results and borehole data of geotechnical (geological) engineering. …”
Get full text

Back Analysis of Rock Hydraulic Fracturing by Coupling Numerical Model and Computational Intelligent Technology by Shaojun Li, Hongbo Zhao, Xiating Feng, Quan Jiang, Qiancheng Sun

“…The hydraulic fracturing numerical model provides the samples which include borehole pressure, in situ stress, and elastic parameters. …”
Get full text

Sidewall Roughness Measurement and Bearing Performance Simulation of Rock-Socketed Piles Based on Laser Scanning Point Cloud by Junbao Zhang, Yule Hu, Yiteng Wang, Di Zhang

“…In this work, a laser radar system is developed to measure the surface roughness of a dry bored pile and the shape of the borehole, and a three-dimensional model of the borehole is reconstructed based on the laser point cloud. …”
Get full text

Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine by Zhili Su, Wenbing Xie, Shengguo Jing, Xingkai Wang, Qingteng Tang

“…The deep shear failure also induced the formation of the nonadjacent crushing zone and elastic zone, which is in line with the borehole imaging results.…”
Get full text

Numerical Optimization of Drilling Parameters for Gas Predrainage and Excavating-Drainage Collaboration on Roadway Head by Mingkun Luo, Lei Yang, Haiou Wen, Dongsheng Zhao, Kun Wang

“…The included angle between the borehole and the roadway middle line determines the spatial area of gas drainage. …”
Get full text

Grouting Reinforcement of Large Building Foundation over Old Gob Areas: A Case Study in Huaibei Mining Area, China by Wenyan Guo, Shiqi Liu, Bingnan Hu, Yanchun Xu, Yaqi Luo

“…However, the results of exploration borehole data and borehole TV observation indicated a broken bedrock stratum and developmental fractures above the old gob areas, and thus, the space stabilities of the building foundation were poor. …”
Get full text

Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas by Xiao Luo, Shuang Gong, Zhonggang Huo, Hongyan Li, Xinpin Ding

“…In addition, based on the results of borehole exploration and the comprehensive analysis of the borehole image, the instantaneous water level elevation in goaf and the development height of the water-conducting fracture zone and caving zone are concluded. …”
Get full text