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Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove

A guide groove and hydraulic fracturing technology, which is applied in directional drilling, earthwork drilling, gas discharge, etc., can solve problems such as abnormal high pressure, and achieve the effects of increasing pressure relief range, reducing pre-pumping time, and reducing measure drilling

Active Publication Date: 2012-08-01
CCTEG SHENYANG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a directional hydraulic pressure penetration enhancement and outburst elimination method for guide grooves to solve the problems of directional fracturing and local high pressure abnormalities, realize regional outburst elimination, and minimize gas disasters

Method used

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  • Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove
  • Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove
  • Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove

Examples

Experimental program
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Effect test

Embodiment 1

[0029] see figure 1 In the coal seam, construct the guide groove drilling 7 and several control drilling holes 6, and then form one or several guide grooves 3 in advance in the bedding boreholes, and then use the high-pressure hydraulic pump station 1 to inject high pressure into the guide groove drilling 7 Water, use the guide groove 3 and the control borehole 6 to carry out directional control on hydraulic fracturing, and press through the coal body between the guide groove borehole 7 and the surrounding preset control borehole 6, so that more holes are formed between the drill holes. Fissures, and a large amount of coal dust is carried out by high-pressure water. After the fracturing is completed, the guide groove borehole 7 and the control borehole 6 are both sealed and connected to the drainage system to start drainage.

[0030] Among them: the guide groove 3 is pre-formed in the coal body, which can be through jet deep penetration technology, or through hydraulic slitt...

Embodiment 2

[0035] see figure 2 In the coal seam, a number of guide groove boreholes 7 and control boreholes 6 are constructed, and then one or several guide grooves 3 are pre-formed in the guide groove boreholes 7, and then the control boreholes 6 are hydraulically fractured, and the guide groove drill holes are used for hydraulic fracturing. The guide groove 3 and the control borehole 6 of the hole carry out directional control on hydraulic fracturing, and press through the coal mass between the control borehole 6 and the guide groove borehole 7, so that more cracks are formed between the boreholes, and through high pressure The water carried a large amount of coal dust. After the fracturing is completed, the guide groove borehole 7 and the control borehole 6 are both sealed and connected to the drainage system to start drainage.

[0036] Among them: the guide groove 3 is pre-formed in the coal body, which can be through jet deep penetration technology, or through hydraulic slitting, ...

Embodiment 3

[0041] see image 3 , constructing several guide groove boreholes 7 in the coal seam, then pre-forming one or several guide grooves 3 in the guide groove boreholes 7, then carrying out hydraulic fracturing to the guide groove boreholes 7, and using the guide groove drilled by the guide groove boreholes 3 and the control borehole 6 carry out directional control on hydraulic fracturing, and press through the coal body between the guide groove boreholes 7, so that more cracks are formed between the boreholes, and a large amount of coal dust is carried out by high-pressure water. After the fracturing is completed, the guide groove boreholes 7 are all sealed and connected to the drainage system to start drainage.

[0042] Among them: the guide groove 3 is pre-formed in the coal body, which can be through jet deep penetration technology, or through hydraulic slitting, rotating water jet slit, hydraulic reaming technology, or through branch drilling and turning drilling. Hole techno...

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Abstract

The invention relates to a directional hydraulic pressing penetration, permeability increase and outburst elimination method of a guide groove, which comprises the steps of (1) constructing a guide groove drill or the guide groove drill and control drills in a coal seam; (2) forming a guide groove in the guide groove drill in advance; (3) utilizing the guide groove drill or the control drills to perform hydraulic fractures, utilizing the guide groove and the control drills to perform directional control on the hydraulic fractures, enabling the coal body between the guide groove drill or the guide groove drill and the control drills to be pressed into penetration, forming multiple fractures among drills, and enabling a large amount of nickings to be brought out through the high-pressure water; and (4) after the fractures finish, enabling all the drills to be sealed and accessed into a drainage system, and beginning extraction. By means of the method, the number of pressing penetration of drills can be increased by 50%, the pressure relief scope of the coal seam is increased by over one time, the permeability of the coal seam is remarkably improved, gas extraction is increased by more than four times, measure drills can be reduced by about 60%, fore-pumping time is effectively reduced, area outburst elimination is achieved, and gas hazards can be reduced to the largest extent.

Description

[0001] technical field [0002] The invention relates to a method for directional hydraulic pressure penetration enhancement and outburst elimination of a guide groove, which is especially suitable for intensified drainage of coal seam gas with high gas and low permeability and outburst elimination in areas of outburst coal seams. Background technique [0003] Most of the coal mines in my country are mines with high gas and low air permeability. Gas accidents account for the largest proportion of all kinds of serious and extraordinarily serious accidents in mines, and cause the most serious losses to mines. And as the depth of coal seam mining increases, the permeability of coal seam decreases, the number of outburst coal seams also increases, and coal and gas outburst mines also increase. In many mining areas, coal and gas outbursts have become bottlenecks restricting safe production in coal mines. [0004] Coal scientific research personnel at home and abroad have conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B7/04
Inventor 王耀锋王魁军李艳增姜文忠高中宁谢正红
Owner CCTEG SHENYANG RES INST
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