Results 21 to 30 of about 6,194 (127)

Gas Displacement Engineering Test by Combination of Low and Medium Pressure Injection with Liquid CO2 in High Gas and Low Permeability Coal Seam

Geofluids, 2020
Mining high-gas coal seams in China has the characteristics mining of deep, high storage and low permeability, and low drainage efficiency, which seriously restrict the efficient prevention and control of mine gas disasters.
Hu Wen, Mingyang Liu, Gaoming Wei, Xiaowei Zhai, Shixing Fan, Xiaojiao Cheng, Hu Wang, Jianchi Hao   +7 more
doaj   +1 more source

Optimal submerged waterjet for gas recovery based on Arbitrary Lagrange‐Euler

Energy Science & Engineering, 2019
This paper proposes a coupled model of waterjet cutting coal containing gas with the Arbitrary Lagrange‐Euler algorithm assistance. The dynamic evolution of coal damage and the cutting performance under different jet conditions, including jet pattern ...
Long Wang, Zhaofeng Wang, Hai Liu, Jinsheng Chen, Tenglong Yang   +4 more
doaj   +1 more source

Comparative study on permeability enhancement effect of separate-layer fracturing and multi-layers comprehensive fracturing in coal seam group

Meikuang Anquan, 2021
In this paper, a gas roadway with multiple coal seams in southwest China is taken as the test site, and the separate-layer hydraulic fracturing and multilayers comprehensive hydraulic fracturing are carried out.
FENG Renjun
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Research on gas pre-drainage in coal roadway strips by combined ordinary drilling and directional drilling

Gong-kuang zidonghua, 2021
When single layered ordinary drilling or directional drilling are used in gaspre-drainage in coal roadway strips, the long boreholes easily deviate from the trajectory and the cost of directional drilling is high.
JI Pengfei, GUO Ying, ZHANG Lei, KONG Xiangguo, WANG Xu, ZHOU Yuxuan   +5 more
doaj   +1 more source

Freezing Method for Rock Cross-Cut Coal Uncovering: Aging Characteristic of Effective Freezing Distance on Injecting Liquid Nitrogen into Coal Seam

Advances in Civil Engineering, 2021
Based on artificial freezing engineering practice, the comprehensive technology is suggested to realize safe and fast rock cross-cut coal uncovering, which mainly includes four steps of drilling, water injection wetting coal, gas drainage, and injection ...
Heyi Ma, Chuanqu Zhu, Pengtao Zhao, Binbin Wang   +3 more
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Discussion on Complementary of Gas and Water Production in Coalbed Methane Wells Reservoir and Procurement Measures

Meikuang Anquan, 2020
The effective pressure drop radius of coal reservoir should be enlarged as far as possible to improve the gas production of CBM well. By analyzing the complementary variation law of water production and gas production during the process of CBM well ...
HU Haiyang, ZHAO Lingyun, CHEN Jie
doaj   +1 more source

Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir

Frontiers in Energy Research, 2021
Stable gas gravity drainage is considered an effective method to enhance oil recovery, especially suitable for deep buried, large dip angle, and thick oil reservoirs. The influence of reservoir heterogeneity on controlling the gas–oil interface and sweep
Hongwei Yu, Lu Wang, Daiyu Zhou, Fuyong Wang, Shi Li, Jun Li, Xinglong Chen, An Cao, Haishui Han   +8 more
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Modeling and prediction for gas production during coalbed methane drainage based on two indirect reservoir parameters

Energy Exploration & Exploitation, 2018
Two indirect parameters influencing coalbed methane (CBM) drainage performances are proposed in this paper, which are effective desorption radius and difference between reservoir pressure and critical desorption pressure (DRPCDP).
Mingjun Zou, Xiaochun Lv, Zhiquan Huang, Simin Wei, Miao Zhang, Changxin Sun   +5 more
doaj   +1 more source

Ultra-High-Pressure Hydraulic Slitting Pressure Relief and Penetration Enhancement Technology and Equipment for Soft Coal Seams

Geofluids, 2022
There is a “bottleneck effect” in the extraction process of ordinary boreholes. It is crucial to enhance the permeability of the boreholes. In this paper, a set of ultra-high-pressure water jet-based drilling and slotting integrated equipment was ...
Xingang Niu, Yi Zhao, Ke Li, Yongjiang Zhang   +3 more
doaj   +1 more source

Parameter optimization and engineering test of liquid CO2 injection in bedding boreholes for coal seam CH4 displacement

Meikuang Anquan
To improve the drainage efficiency of outburst and low-permeability coal seam gas, this study takes the liquid CO2 displacing coal seam CH4 technology as the core, and explores the influence of CO2 injection pressure parameters and borehole spacing on ...
Chao SONG, Xiaokun CHEN, Yong XU
doaj   +1 more source