id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajst-24471	Wang, Yifan	Research on the Effective Extraction radius of Directional Long Boreholes for Coalbed Methane Extraction Based on Gas Extraction Quantity Measurement	2024	6	.pdf	application/pdf	4116	147	56	According to extensive research by researchers [7-9], the amount of gas extraction from boreholes ( ctq ) and the extraction time (t) of boreholes well follow a negative exponential function relationship, as follows: t cct eqq  0 (1) 61 Where, 0cq is initial gas extraction amount from a 100 meter borehole, m3/min·hm-1; ctq is the average gas extraction amount from a 100 meter borehole at extraction time t, m3/min·hm-1;  is attenuation coefficient of drilling gas extraction volume, d-1; t is gas extraction time of drilling holes, d. By integrating equation 1, the total amount of gas extraction from boreholes within any time t day can be obtained:    ) [6] Chen Yuexia, Chu Tingxiang, Chen Peng, et al. Quantitative study of three-dimensional numerical simulation for optimizing the spacing of gas extraction boreholes [J].	cache/ajst-24471.pdf	txt/ajst-24471.txt