Results 161 to 170 of about 588,838 (198)

A Review of Instability Mechanisms and Control Technologies for Gas Drainage Boreholes in Soft Coal Seams in China. [PDF]

ACS Omega
Liu H, Chen X, Li J, Wang L, Yang Z, Yu J.   +5 more
europepmc   +1 more source

Experimental Study on the Velocity Sensitivity of Coal Reservoir During Coalbed Methane Drainage in Southern Qinshui Basin

Energy Exploration and Exploitation, 2018
Determination of the velocity sensitivity in coal reservoirs during the different production stages of coalbed methane wells is fundamentally crucial to adopt appropriate drainage technologies. To address this need, simulation experiments of coal samples
Shuxun Sang, Huihu Liu, Hongje Xu
exaly   +3 more sources

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Stress Relief Coalbed Methane Drainage by Surface Vertical Wells in China

International Journal of Coal Geology, 2010
Abstract This paper summarizes the status of engineering practice, technology and research related to stress relief coalbed methane (CBM) drainage using surface wells in China during the past 10 years. Comments are provided on the theory and technical progress of this method.
Shuxun Sang
exaly   +2 more sources

Novel Prediction Methods for Under-Saturated Coalbed Methane Wells: Effect of Drainage Schedules

Journal of Petroleum Science and Engineering, 2019
Abstract A detailed study for production prediction methods under various drainage schedules for under-saturated coalbed methane wells is performed. In terms of the relationship between the value of average reservoir pressure and the critical desorption pressure, whole production life of under-saturated coalbed methane wells is divided into two ...
Keliu Wu, Juntai Shi, Yuanhong Li
exaly   +2 more sources

Controlling Factors of Coalbed Methane Well Productivity of Multiple Superposed Coalbed Methane Systems: A Case Study on the Songhe Mine Field, Guizhou, China

Energy Exploration and Exploitation, 2017
The Songhe mine field located in western Guizhou Province of China is the most typical region of multiple coal seam development. However, the coalbed methane development practices of commingled drainage in recent years have been proved to be less ideal ...
Dazhen Tang, Hao Xu
exaly   +2 more sources

Anisotropic Evolution of Effective Stress and Pore Pressure during Coalbed Methane Drainage

SPE Journal, 2023
Summary The anisotropy and dynamic variation in permeability of gas-adsorbing coals have a significant influence on fluid flow behavior in the cleat system. The assumption of a constant anisotropy coefficient (the ratio between permeability components in orthogonal directions) has been traditionally made to simplify the seepage-stress ...
Taiyuan Zhang, Shida Chen, Dazhen Tang
openaire   +1 more source

The Case for Enhanced Coalbed Methane Using Hydraulic Fracturing in the Geostructural Belt

Energy Exploration and Exploitation, 2018
Coal and gas outbursts mostly occur during mining at geostructural belts. Pre-drainage coalbed methane using hydraulic fracturing is one of the methods to prevent outbursts.
Chao Sun, Guozhong Hu
exaly   +2 more sources

Prevention of Nanoscale Fines in Open-Hole Horizontal Coalbed Methane Wells During the Drainage Process

Journal of Nanoscience and Nanotechnology, 2021
Because coal is quite weak compared with conventional sandstone, shear failure downhole will produce a large amount of nanoscale coal fines during the drainage process. Since the size of pores in coal is on the nanoscale range, these fines will sometimes cause serious damage problems downhole.
Chunhua, Guo, Yu, Yang, Hansen, Sun, Wangang, Chen, Ping, Yan, Xiang, Wu, Hao, Zhang   +6 more
openaire   +2 more sources