Results 11 to 20 of about 6,595 (218)

Determination of effective drainage radius in special high gas mines

Thermal Science and Engineering
The effective drainage radius of coal seam is an important basis for the spacing of pre-drainage gas boreholes.To quickly and accurately determine the effective drainage radius, a new methodwasproposed.For thecoalface where the desorbable gas content before mining has met the standard, the compliance of mine gas drainage ratewas usedas the ...
exaly   +2 more sources

A novel model for predicting the productivity index of horizontal/vertical wells based on Darcy's law, drainage radius, and flow convergence

Heliyon
The Productivity Index (PI) of oil wells is essential to developing a field's production plan, and previous studies report different models for predicting the PI of horizontal or vertical wells. However, predicting the PI of horizontal and vertical wells
Roland I. Nwonodi
doaj   +3 more sources

Response surface analysis of influencing factors of borehole gas extraction effect

Meikuang Anquan, 2022
In order to investigate influence of different factors on borehole gas drainage performance, in-situ stress field test in targeted mining area was carried out.
GONG Xuanping, XUE Sheng, HAN Baiqing, NIAN Futian, ZHENG Chunshan, CHENG Xiaoyu   +5 more
doaj   +1 more source

Study on reasonable criterion of effective extraction radius based on desorption gas index

Meikuang Anquan, 2021
In order to get the real effective drainage radius to guide the gas pre-drainage in mining-coal bed, this paper starts from the essential goal of gas extraction, based on the requirements of gas extraction up to standard, establishes the core criterion ...
SUN Xiaoming
doaj   +1 more source

Numerical simulation study on gas drainage by interval hydraulic flushing in coal seam working face

Energy Exploration & Exploitation, 2021
In order to solve the problem of difficult gas extraction in coal mine, a method of gas extraction from coal seam by interval hydraulic flushing is put forward.
Shengrong Xie, Junqi Cui, Dongdong Chen, Ping Chen   +3 more
doaj   +1 more source

Influence of interlayer channeling of composite reservoir on gas drainage

Meikuang Anquan, 2022
In order to investigate the influence of surrounding rock characteristics on gas drainage of through layer borehole in composite reservoir, the seepage law of gas in coal seam and rock stratum is analyzed.
ZHANG Zhiyuan, ZHU Chuanjie, LIU Siyuan, LI Long   +3 more
doaj   +1 more source

Study and application on influence mechanism of instability and collapse of drainage borehole on gas drainage

Meitan xuebao, 2023
The instability and collapse of drainage boreholes is one of the key problems that hinder the efficient extraction of coal-bed methane (CBM). In order to solve the problem of instability and collapse of extraction boreholes in soft coal seams, based on ...
Xuebo ZHANG, Hao WANG, Ming YANG, Pan WANG, Linxiu HAN   +4 more
doaj   +1 more source

Numerical Simulation of Gas-Solid Coupling in Pressure-Relief Gas Drainage of Short-Distance and Underprotective Steeply Inclined Coal Seam Mining

Geofluids, 2022
The accuracy of the drainage radius plays a vital role in the gas drainage effect, and the establishment of the drainage model and numerical calculation of the model has an essential value for the accurate determination of the drainage radius.
Xinshan Peng, Zhaofeng Wang, Lingling Qi
doaj   +1 more source

Experimental Study on Reasonable Spacing after Carbon Dioxide Presplitting in Low-Permeability Coal Seam

Advances in Civil Engineering, 2021
Gas disasters have been always a major hidden danger that affects mining safety in coal mines. Gas drainage by drilling is the fundamental method of gas control in coal mines.
Zongyong Wei, Shugang Li, Haifei Lin, Botao Li, Yang Ding, Haiqing Shuang   +5 more
doaj   +1 more source

Study on effective extraction radius of bedding borehole under the impact of normal fault

Gong-kuang zidonghua, 2022
The reasonable effective extraction radius of borehole is the key to ensure gas extraction effect. However, the research of effective extraction radius mainly focuses on the measurement method of effective extraction radius of borehole, and there is a ...
JIANG Mingquan, KANG Xiangtao, YAN Chaoxing, TANG Meng, WANG Ziyi   +4 more
doaj   +1 more source