Surface efficient gas extraction mode based on full coverage of working face

Authors

FANG Jiawei, China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
HAN Baoshan, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
ZHOU Jiajia, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
WANG Zhengxi, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
ZHANG Dingliang, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
LIU Jia, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
XU Jianjun, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

Aiming at the problems of soft and broken coal seam, low permeability, difficulty in gas extraction and low drainage efficiency in working face, a full-coverage mode for gas extraction in working face through the horizontal well group with staged fracturing roof at both ends is proposed. Taking a mine in Suxian mining area of Huaibei coalfield as an example, based on the characteristics of in-situ stress and working face distribution, combined with the analysis of gas geological conditions and coal seam mechanical properties in the area, the cross section dipole sonic logging method was used to optimize the orientation of the horizontal section of the horizontal well, and the horizontal well was determined by the Fracpro PT fracturing simulation technology. The horizontal section was away from the coal seam 7₁ arranged within 2 m of the top of the coal seam; the drainage simulation technology was used to predict the test project in the study area, the gas content and pressure of the working face have greatly reduced after 3 years of drainage, which meets the requirements of full coverage of gas drainage in working face. The extraction mode proposed in this paper provides a means for the efficient extraction of ground gas in domestic coal mines with similar conditions.

Keywords

gas, full coverage extraction mode, roof horizontal well, fracturing, numerical simulation, Huaibei Suxian mining area

DOI

10.3969/j.issn.1001-1986.2020.03.012

Recommended Citation

FANG Jiawei, HAN Baoshan, ZHOU Jiajia, et al. (2020) "Surface efficient gas extraction mode based on full coverage of working face," Coal Geology & Exploration: Vol. 48: Iss. 3, Article 13.
DOI: 10.3969/j.issn.1001-1986.2020.03.012
Available at: https://cge.researchcommons.org/journal/vol48/iss3/13

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