Gas extraction method through drilling along coal seam on basis of extraction pipeline valve control

Abstract

The invention discloses a gas extraction method through drilling along a coal seam on the basis of extraction pipeline valve control. The method comprises the following steps that 1) gas along the coal seam is uniformly extracted from an angle of the extraction drilling arrangement in an extraction process, an air intake roadway and an air return roadway start to be tunneled from the position of astopping line, along with tunneling of the roadways, extraction drilling holes are sequentially arranged on the air inlet roadway side, when tunneling is advanced to the position of an open-off cut,the extraction drilling arrangement is ended, an extraction valve adjacent to the position of the stopping line is adjusted down, an extraction valve adjacent to the position of the open-off cut is adjusted up, more negative pressure is distributed to the extraction drilling holes adjacent to the open-off cut, and an extraction flow in the extraction drilling holes adjacent to the open-off cut position is increased; and 2) the gas along the coal seam is efficiently extracted according to the pressure distribution rule on the ore and the permeability coefficient of the coal seam, valves, adjacent to a working face area, of a pressure relief area and valves of a pressurization area are closed, valves, adjacent to the pressurization area, of the pressure relief area are opened all, and the purpose of efficient gas extraction is achieved.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mines, in particular to a method for gas drainage along coal seam boreholes based on valve control of drainage pipelines. Background technique [0002] With the improvement of the mechanization level of coal mining, and the large-scale promotion and application of the full-high technology of one-time mining of extra-thick coal seams and the technology of fully mechanized top coal caving, the advancing speed of the working face is getting faster and higher, and the output is getting higher and higher; As the depth extends, the gas content in coal seams will become higher and higher; the measures of coal mine gas drainage are the key to solving the above problems. [0003] In the process of gas drainage, the gas drainage along the coal seam involves the following factors: the layout of the drainage boreholes, the process of excavating the coal seam, the recovery of the coal mining face,...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the current problem of uneven and inefficient gas extraction along the coal seam, and to provide a gas extraction method based on the valve control of the drainage pipeline, so as to finally achieve uniform and efficient extraction of gas in the coal seam

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