Results 91 to 100 of about 441,091 (198)

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

Response Surface Analysis on Multiple Parameter Effects on Borehole Gas Extraction Efficiency

Processes
To explore the impact of different factors on the effectiveness of borehole gas extraction, in situ stress tests were conducted in a test mining area. A theoretical model of gas migration within the coal matrix–fracture system was established.
Xiaoyu Cheng, Cheng Cheng, Lu Xiao, Xingying Ma   +3 more
semanticscholar   +1 more source

Temporal and spatial evolution mechanism of large-diameter borehole pressurerelief and permeable gas seepage in high gas coal seam

Meitan kexue jishu
Mine gas extraction has the dilemma of low extraction rate, short effective extraction cycle, and substandard gas pre-extraction concentration. In order to realize the precise pressure relief and permeability of high gas and low gas permeability coal ...
Fangtian WANG, Zhe LI, Cun ZHANG, Dongsheng HE, Yang ZHANG   +4 more
doaj   +1 more source

Effect of fracture distribution on extraction efficiency in low-permeability NAPL-contaminated formations

IOP Conference Series: Earth and Environment
Hydraulic fracturing offers an effective solution to the challenge of remediating low-permeability contaminated formations by improving substance transport rates. In this study, COMSOL Multiphysics, a large-scale multi-physics coupled simulation software,
Jiu-Ge Niu, Shijin Feng, Qiteng Zheng, Chun-Bai-Xue Yang   +3 more
semanticscholar   +1 more source

An Effective LiDAR-Inertial SLAM-Based Map Construction Method for Outdoor Environments

Remote Sensing
SLAM (simultaneous localization and mapping) is essential for accurate positioning and reasonable path planning in outdoor mobile robots. LiDAR SLAM is currently the dominant method for creating outdoor environment maps.
Yanjie Liu, Chao Wang, Heng Wu, Yanlong Wei   +3 more
semanticscholar   +1 more source

A Method for Extracting Dynamic Vortex Acoustic Signal Characteristics in Island and Reef Channels Based on Time-Reversal Mirrors

Applied Sciences
Ships navigating in channels with vortex fields face increased risks. However, these vortex fields can be monitored using acoustic methods. The key is to extract the phase characteristics of sound signals passing through the vortices. Using time-reversal
Min Yu, Hang Liu, Wei Zhou, Dingfan Fan
doaj   +1 more source

Study and application of the energy unit cutting theory and punching-blasting synergy permeability enhancement technology in tectonic anomaly areas of coal mines

Meitan xuebao
The coal seams in tectonic anomaly areas have high gas content, high geostress, low permeability, the development of tectonic coal, and uneven distribution of disaster-causing energy.
Jingyu JIANG, Xiaobin DONG, Mintao WEI, Chenghao WANG, Yuanping CHENG, Xiaoning SHI   +5 more
doaj   +1 more source

Numerical simulation of gas drainage from goaf via high-level borehole in gently inclined seams

AIP Advances
Gas disasters pose a significant constraint on the safe development of coal mines. Focusing on the problem of gas over-limits in the upper corner of a hard roof, this study takes the I010206 working face of Kuangou Coal Mine as a case study and proposes ...
Xiaojun Li, Shihao Guo, Bangbang Mu
doaj   +1 more source

Characterization of coal seam permeability stage evolution and gas dynamic transport before and after reaming

矿业科学学报
Mechanical reaming technology can significantly improve the permeability of coal seams, thus promoting gas extraction from low-permeability coal seams, and is an effective measure to reduce the risk of gas dynamic disasters. To elucidate the mechanism by
XU Chao, YUAN Yongwang, WANG Kai, JIANG Lixiang, HU Yuanyuan, CAI Yongbo, LIU Wei   +6 more
doaj   +1 more source

A method for determining fracturing radius of blasting holes based on SF6 gas tracing

Meikuang Anquan
The fracturing radius, as a key indicator characterizing the energy transfer of mine blasting and the fragmentation effect of rock mass, its precise determination is directly related to the safety and energy efficiency of blasting engineering.
Dongxu JIA
doaj   +1 more source