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Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area

A technology for outburst coal seam and gas extraction, which is applied in the field of pre-draining coal roadway strip gas in a single soft outburst coal seam in unmined areas, and can solve the problem that the soft and high outburst original coal seam cannot be applied, etc.

Inactive Publication Date: 2013-01-02
HENAN COAL CHEM IND GROUP INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology can only be implemented under the condition that the mining roadway has been arranged underground in the coal mine, and it cannot be applied to the soft and high outburst original coal seam in the unmined area without roadway layout.

Method used

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  • Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area
  • Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area
  • Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for pre-pumping coal lane strips of gas in a ground horizontal well to the roof of a single soft outburst coal seam in an unmined area. For the near-horizontal single, soft, low-permeability, high outburst coal seam 6 with a thickness of 5.7m and a buried depth of 685m, the failure type of the coal in this seam is Class V, the coal quality is mostly powdery, and the coal type is mylonitic coal; Content is 21m 3 / t, the gas pressure is 1.5MPa; the immediate roof 7 of the coal seam is sandy mudstone and silty rock, with a thickness of 1.96-9.97m, with an average thickness of 5.27m; the old roof is fine sandstone, with a thickness of 1.22-11.95m, with an average thickness of 5.05m; The immediate floor 8 of the coal seam is sandy mudstone or carbonaceous mudstone, with a thickness of 0.74-17.93 meters, with an average thickness of 7.00 meters. The old bottom is sandstone, with a thickness of 0.45-26.5 meters, with an average thickness of 10.70 meters. There is a lim...

Embodiment 2

[0042] A method for pre-pumping coal lane strips of gas in a ground horizontal well to a single soft outburst coal seam floor in an unmined area. For the nearly horizontal single, soft, low permeability and high outburst coal seam 6 with a thickness of 4.8m and a buried depth of 720m, the failure type of the coal in this seam is Type III, and the coal quality is mostly fragmented; the gas content is 14m 3 / t, the gas pressure is 1.2MPa; the immediate roof of the coal seam is black mudstone and carbonaceous mudstone, 2.8-7.2m thick, with an average thickness of 5.4m, and the old roof is medium-coarse sandstone, with a thickness of 8.1-12.3m, with an average thickness of 9.5m The immediate floor 8 of the coal seam is sandy mudstone or mudstone, 2.4-15.6 meters thick, with an average thickness of 10.3 meters, and the old bottom is sandstone, with a thickness of 3.5-27.8 meters, with an average thickness of 14.5 meters. Coal seam roof 7 has confined water in sandstone fissures of ...

Embodiment 3

[0049] The invention relates to a method for carrying gas in strips of coal roadways for pre-extraction of coal roadways by multi-branch horizontal wells on the ground to the roof and floor of a single soft outburst coal seam in an unmined area. For the near-horizontal single, soft, low-permeability, high-outburst coal seam 6 with a thickness of 6.68m and a buried depth of 700m, the failure type of the coal in this seam is Class IV, and the coal quality is mostly powdery and fragmented; the gas content is 28m 3 / t, the gas pressure is 1.7MPa; the immediate roof 7 of the coal seam is sandy mudstone, 2.6-6.9m thick, with an average thickness of 4.8m; the old roof is fine sandstone, with a thickness of 3.2-16.5m, with an average thickness of 8.4m; The sandy mudstone or carbonaceous mudstone is 2.4-15.6 meters thick, with an average thickness of 7.6 meters. The old bottom is sandstone, with a thickness of 1.8-20.6 meters, with an average thickness of 12.5 meters. The roof and floo...

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Abstract

The invention provides a method for pre-pumping coal roadway stripe gas of a single soft protruded coal seam of an unexploited area and relates to the technical field of gas pumping. Through the method, outburst removal of the area with a single soft hypotonic protruded coal seam coal roadway stripe can be achieved. The method for pre-pumping the coal roadway stripe gas of the single soft protruded coal seam of the unexploited area comprises building a concordant layer horizontal well which is 3-6m away from the coal seam from the ground to a top plate and a base plate of the single soft protruded coal seam of the unexploited area, performing segmented fracturing after oriented perforating, enabling top plate and base plate rock terrane where coal seam gas is sealed and stored originally to be transformed into a pumping liberation layer with developed fracture networks, enabling the pumping liberation layer to be communicated with the coal seam in a large-area mode through the fracture networks, performing decompression and aerogenesis by dewatering, determining whether to perform negative pressure pumping according to water production conditions, enabling the coal seam gas to be desorbed and diffused continuously, and pumping the gas massively by pumping a horizontal well opening in the liberation layer. By pumping the gas massively, the outburst prevention index in the coal roadway stripe can be reduced to below the safety standard in the outburst prevention rules, and safe and speedy drivage is achieved.

Description

technical field [0001] The invention relates to a method for pre-pumping strip gas from a coal roadway in a single soft outburst coal seam in an unmined area. Specifically, for single, soft, low-permeability, and outburst coal seams, a method of pre-pumping coal roadway strip gas through ground horizontal fracturing wells is proposed. Background technique [0002] Mine gas has become the biggest hazard to my country's coal mine safety production, and is the "number one killer" that threatens miners' lives. The fundamental way to control gas disasters, eliminate coal and gas outbursts, and realize green co-mining of coal and gas resources is to extract coal gas. [0003] With the increase of mine excavation depth, gas content and gas pressure increase, many low-gas mines have gradually evolved into high-gas mines and outburst mines, and the outburst disasters have become more and more serious, so that drilling holes in this coal seam is harmful to coal. A slight disturbance...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21F16/00E21B43/116E21B43/26
Inventor 陶云奇马耕李伍成苏现波贾金才丁建础辛新平张秀全
Owner HENAN COAL CHEM IND GROUP INST
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