A Synchronous Drainage Method for Repetitive Hydraulic Fracturing Displacing Gas in Soft Coal Seam

A technology of hydraulic fracturing and gas drainage, which is applied in the direction of gas discharge, mining equipment, mining fluids, etc., can solve the problems of short duration of gas drainage in coal seams, reduce the risk of outburst, reduce the quantity, and improve gas drainage. The effect of mining efficiency

Active Publication Date: 2022-05-13
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a method for synchronous drainage of gas in soft coal seam repeated hydraulic fracturing to solve the problem of short duration of coal seam gas drainage effect after hydraulic fracturing

Method used

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  • A Synchronous Drainage Method for Repetitive Hydraulic Fracturing Displacing Gas in Soft Coal Seam
  • A Synchronous Drainage Method for Repetitive Hydraulic Fracturing Displacing Gas in Soft Coal Seam
  • A Synchronous Drainage Method for Repetitive Hydraulic Fracturing Displacing Gas in Soft Coal Seam

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Embodiment

[0061] A method for synchronous drainage of gas by repeated hydraulic fracturing in soft coal seams with a thickness of 4m, see Figure 1 ~ Figure 2 , along the strike direction of the coal seam 6, the bed-crossing hydraulic fracturing borehole 1 is arranged, and the bed-crossing hydraulic fracturing borehole 1 is arranged on both sides of the bed-crossing gas drainage borehole 4, and the coal seam top plate 5 and the coal seam bottom plate 7 respectively The upper and lower sides of the upper and lower sides of the coal seam 6 are provided with a main gas drainage pipeline 9 and a hydraulic fracturing pump set 11 in the floor rock roadway 8 below the coal seam 6. The main drainage pipeline 9 is connected, and the hydraulic fracturing drilling 1 through the layer is connected with the hydraulic fracturing pump set 11; the high-pressure water in the hydraulic fracturing drilling 1 through the layer figure 2 The high-pressure water in the flow direction 2 penetrates to the surr...

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Abstract

The invention relates to a method for synchronous drainage of gas by repeated hydraulic fracturing in soft coal seams, which belongs to the technical field of gas drainage and comprises the following steps: arranging hydraulic fracturing drilling holes in soft coal seams along the direction of the coal seam; At the same time as the hydraulic fracturing drilling, the interbedded gas drainage drilling is arranged, and the design water pressure Q for hydraulic fracturing is determined according to the occurrence of the coal seam, and then the hydraulic fracturing is performed according to the design water pressure Q, and the gas drainage is carried out at the same time. Hydraulic fracturing adopts the method of repeated hydraulic fracturing, and the average gas concentration a in the perforated gas drainage boreholes within the scope of hydraulic fracturing is used as the concentration critical value of repeated hydraulic fracturing. The invention solves the problem of short duration of coal seam gas extraction effect after hydraulic fracturing, can improve the coal seam gas extraction rate and extraction efficiency, reduce the gas content of the coal seam, and rapidly reduce the outburst risk of coal and gas.

Description

technical field [0001] The invention belongs to the technical field of gas drainage, and relates to a method for synchronous drainage of gas by repeated hydraulic fracturing in soft coal seams. Background technique [0002] Analysis of coal mine accidents in my country, especially major disasters, coal seam gas is still the root cause of its occurrence, so coal seam gas drainage is the key to preventing coal mine gas accidents. The permeability of high gas and outburst mines in my country is as low as 10% -3 ~10 -4 mD order of magnitude, which belongs to low permeability coal seams. The coal seam gas extraction radius is small and difficult to extract, which directly affects the extraction concentration, extraction rate and extraction volume of coal seam gas. [0003] Underground coal mines, using hydraulic fracturing technology to improve the permeability of coal seams has many advantages. However, due to the obvious differences in the occurrence conditions and parameter...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/00E21B43/26E21B43/20
CPCE21F7/00E21B43/006E21B43/26E21B43/20
Inventor 李良伟武文宾林府进张兆一江万刚李日富刘洋孙朋潘雪松姚壮壮
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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