Results 21 to 30 of about 152 (101)

Thingking and utilization technology of coalbed methane in soft and low permeability coal seams in Huainan Mining Area [PDF]

Meitan kexue jishu, 2022
In order to solve the problems that restrict the efficient development of coalbed methane resources under the conditions of soft and low permeability outburst coal seams in Huainan Mining Area, such as complex coal seam structure, multi-source gas ...
Xiangxi KONG, Yongzhi TANG, Ping LI, Chuanbing WANG, Jian CHEN, Yanqing LI, Benqing YUAN, Benliang CHEN, Min YE   +8 more
doaj   +2 more sources

Key technologies for coordinated development of coalbed methane in inclined soft coal seam groups: a case study of Aiweigou Mining Area

Meitan kexue jishu
In order to clarify the key technologies for the coordinated development of coal and coalbed methane that are compatible with the mining conditions of inclined broken soft coal seams.
Yunpei LIANG, Shuancheng ZHU, Liang CHEN, Kun ZHAO, Dongling SUN, Jianjie CHEN, Bichuan ZHANG   +6 more
doaj   +2 more sources

Study on the Rheological Failure Mechanism of Weakly Cemented Soft Rock Roadway during the Mining of Close-Distance Coal Seams: A Case Study

Advances in Civil Engineering, 2020
During the mining of the shallow-buried and close-distance multiple coal seam, the rheological failure of the surrounding weakly cemented soft rock of the roadway in the lower coal seam under the concentrated stress is very rare.
Wenkai Ru, Shanchao Hu, Jianguo Ning, Jun Wang, Qingheng Gu, Yong Guo, Jing Zuo   +6 more
doaj   +2 more sources

Development and application of intelligent multi-functional dust removal system for air directional drilling

Meikuang Anquan, 2023
In order to solve the problems of dust pollution, poor lubrication of screw motor and overtemperature in the hole during air directional drilling in broken soft coal seams, an intelligent multifunctional dust removal system was developed for the first ...
LI Kun, ZHANG Jie
doaj   +2 more sources

Research progress of coal seam gas content determination technology and equipment [PDF]

Meitan kexue jishu
Gas content is an important parameter for the prediction of coal and gas outburst risk, the estimation of coal seam gas resource, and the design of mine gas control engineering.
Siqing SUN, Fan YANG, Yuqi ZHENG, Qingli ZHANG   +3 more
doaj   +2 more sources

Gas control technology of sleeve milling and fishing for directional drilling in broken soft coal seam

Meikuang Anquan
Aiming at the technical problem of abnormal gas outflow caused by collapsed holes in the process of directional drilling and sleeve milling in broken-soft coal seams, a gas prevention technology was proposed for directional drilling and sleeve-milling ...
Xu YANG, Jianqiang WANG, Hongjie ZHANG, Jie ZHANG, Yazhou ZHANG, Hanjing HUANG, Tianzhu CHEN   +6 more
doaj   +2 more sources

Calculation Method of Overburden Damage Height Based on Fracture Mechanics Analysis of Soft and Hard Rock Layers

Geofluids, 2019
Under the geological condition of soft and hard rock interaction stratum, the overburden damage height can provide a quantitative support for the design of the locations of gas drainage boreholes in the roof mining fracture zone and the determination of ...
Liang Chen, Shaowu Fan, Can Zhao, Lang Zhang, Zhiheng Cheng   +4 more
doaj   +2 more sources

Research on the Law of Layered Fracturing in the Composite Roof Strata of Coal Seams via Hydraulic Fracturing

Energies
Horizontal wells within the roof are an effective method to develop gas in broken and soft coal seams, and layer-penetrating fracturing is a key engineering method for the stimulating of horizontal wells within the roof of a coal seam.
Bo Wang, Enke Hou, Liang Ma, Zaibin Liu, Tao Fan, Zewen Gong, Yaoquan Gao, Wengang Du, Qiang Liu, Bingzhen Ma   +9 more
doaj   +2 more sources

Study on technology and effect of gas extraction in horizontal well with segmental hydraulic fracture in roof of coal seam in Huainan mining area [PDF]

Meitan kexue jishu
Huainan mining area is a typical high-gas area, with broken soft coal seam, low permeability, high gas content, and difficulty in extraction. In order to probe into the technical feasibility and gas control effect of the horizontal well for segmental ...
Benliang CHEN, Liang YUAN, Sheng XUE, Wenping JIANG, Ke YANG, Tao ZHOU, Dandan LI, Jing WU   +7 more
doaj   +2 more sources

Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining

Applied Sciences
The mining of shallow coal seam groups triggers mine water inrush and ecological environment destruction. Effective groundwater prevention and control requires controlling the compaction and seepage characteristics (CSCs) of broken rock in goaf.
Kaijun Miao, Shihao Tu, Wenping Li, Jinghua Li, Jinhu Tian, Hongbin Zhao, Jieyang Ma   +6 more
doaj   +2 more sources