The In-Hexagon Borehole Layout for the Optimization of the Effective Radius of Gas Extraction

Luwei Zhang, Yanyu Chu, Yong Zhou, Gaofeng Ren (), Yongxiang Ge and Jun Liu
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Luwei Zhang: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Yanyu Chu: China Academy of Safety Science and Technology, Beijing 100012, China
Yong Zhou: Chonfar Engineering and Technology Corporation Ltd., Changsha 410000, China
Gaofeng Ren: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Yongxiang Ge: School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Jun Liu: School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Sustainability, 2023, vol. 15, issue 17, 1-22

Abstract: This research was conducted in order to study the relationship between gas geology (initial gas pressure, initial permeability, and buried depth) and effective extraction radius and to achieve precise borehole layouts. Based on the in-hexagon borehole layout mode, the influence of geological factors on borehole effective extraction radius is quantitatively analyzed. Combined with gas geology, the precise borehole layout mode of gas extraction is constructed. The results show that: Based on the two evaluation indexes of borehole number and area redundancy rate, the optimal implementation scheme of the in-hexagon is selected; that is, when the effective extraction radius is R , the borehole spacing along the coal seam strike is 3 R , and along the dip is 1.5 R . Based on the four evaluation indexes of effective extraction space volume, relative gas emission, cost rate, and gas isobaric surface shape, the relationship between effective extraction radius and initial gas pressure, permeability, and burial depth is matched quantitatively. The effective extraction radius decreases with the initial gas pressure and buried depth and increases with the initial permeability. The effective extraction radius and initial gas pressure have a linear relationship R = a P + b , the effective extraction radius and initial permeability have a power function relationship R = a k b , and the effective extraction radius and burial depth have a negative exponential relationship R = a e − bH . The response surface interaction model analysis shows that the buried depth has the strongest influence on the effective radius of gas extraction, followed by the initial gas pressure and the initial permeability. Based on the effective extraction radius as a function of gas geology, the precise borehole layout mode of gas extraction is constructed, which can provide a reference for the construction design of underground gas drilling in coal mines. This will provide a technical guarantee for the efficient mining of gas and promote the sustainable development of gas resources.

Keywords: gas extraction; in-hexagon borehole layout; effective extraction radius; borehole layout; grading co-mining (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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