Study on gas extraction radius of main coal seam in No.8 well of Sikeshu mining area
ZHANG Kang
YANG Zhou
WANG Zheng-shuai
Abstract：In order to grasp the extraction radius of the main coal seam in No.8 well of Sikeshu mining area,the borehole gas flow meth-od was used to investigate and study the relationship between extraction time and extraction pure flow rate,as well as the relationship between extraction time and extraction radius.The effective extraction radius of coal seam B5 and coal seam B6 at different extraction times were calculated theoretically.The research results indicated that the net flow rate of extraction decreases in a negative exponential pattern with the increase of extraction time,and eventually tended to stabilize.The effective gas extraction radius was positively correla-ted with the extraction time,but when the extraction time exceeded a certain value,the extraction radius tended to stabilize.Under the extraction conditions of an average negative pressure of 18 kPa,the effective extraction radius corresponding to 30,60,90 and 120 d of extraction in coal seam B5 were 1.20,2.13,2.84 and 3.40 m,respectively.Under the extraction conditions of an average negative pres-sure of 13 kPa,the effective extraction radius corresponding to 30,60,90 and 120 d of extraction in coal seam B6 were 2.22、2.71、2.81、2.84 m,respectively
Keywords：gas extractionbedding boreholeeffective extraction radiusdrilling gas flow methodextraction time
Publication Date：2024-04-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 111-114,119 )