Ground and underground combined coal and coal-bed gas co-mining method for low-permeability coal bed group

A technology of coalbed methane and low air permeability, applied in underground mining, mining fluid, surface mining, etc., can solve the problems of low coal seam permeability, high cost, and long investment recovery period, so as to improve coal mining efficiency, reduce outburst risks, The effect of low gas content

Active Publication Date: 2020-04-21
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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AI Technical Summary

Problems solved by technology

Through the method of ground pre-pumping of coalbed methane wells, due to the low permeability of coal seams, the production of gas wells is low, and the cost is high, the extraction effect is often unsatisfactory, and the investment recovery period is long

Method used

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  • Ground and underground combined coal and coal-bed gas co-mining method for low-permeability coal bed group
  • Ground and underground combined coal and coal-bed gas co-mining method for low-permeability coal bed group
  • Ground and underground combined coal and coal-bed gas co-mining method for low-permeability coal bed group

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Embodiment Construction

[0023] The present invention is described in detail below in conjunction with accompanying drawing:

[0024] Such as figure 1 As shown, a method for co-mining coal and coalbed methane in the upper and lower wells of a low-permeable coal seam group comprises the following steps:

[0025] (1) The protective layer (safety layer) is mined first. When the protective layer is mined, negative pressure extraction of CBM is carried out through mining wells. The mining wells are arranged within the range of 40-50m from the return airway. The well spacing is controlled within the range of 80-200m, and the distance and well spacing from the mining well to the return airway are reasonably set according to the actual gas content of the coal seam and the frequency of gas exceeding the limit. For areas with high coalbed methane pressure, ground fracturing is used to drain underground wells, surface drilling, fracturing the protective layer, release the pressure of coalbed methane in the area...

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Abstract

The invention discloses a ground and underground combined coal and coal-bed gas co-mining method for a low-permeability coal seam group. The method is applied to a gas outburst mine, a mode that the protective layer mining is combined with the ground gas extraction is used for a coal reservoir with the characteristics of low permeability and low gas content, so that an adjacent coal bed is subjected to rapid pressure relief, coal-bed gas is efficiently and rapidly extracted from the ground, and a co-mining technology system that ground and underground are combined to extract the coal-bed gas and coal and the coal bed gas are extracted while being pumped is provided, so that a highly-located drainage roadway and an end-located drainage roadway are replaced to the maximum extent, the coal mine gas treatment cost is effectively reduced, the ground coal-bed gas well yield is increased, the coal mine gas outburst risk and the gas overrun accident occurrence frequency is reduced, the coal mining efficiency is improved, and the coal mine mining safety and efficiency are realized.

Description

technical field [0001] The invention belongs to the technical field of co-mining of coal and coal-bed methane, and more specifically relates to a method for co-mining of coal and coal-bed methane by combining upper and lower wells for gas outburst mines in low-permeability coal seam groups using protective layer mining technology. Background technique [0002] At present, the gas drainage method of most low-permeability gas outburst mines adopts the "Huainan model", that is, the protective layer mining model. In this mode, after the mining of the protective layer, a goaf is formed to release the pressure on the adjacent coal seam, so that the air permeability of the adjacent coal seam increases, and the gas changes from the adsorption state to the free state. Before the protected coal seam is mined, it is still necessary to carry out underground gas pre-extraction three years or more in advance, through a combination of various measures such as bottom or high-level drainage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00E21C41/18
CPCE21B43/006E21B43/26E21C41/18E21F7/00
Inventor 张江华李兵张永成徐云张为
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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