Porous linear control hydraulic fracturing method

A hydraulic fracturing and hole line technology, applied in the field of hydraulic fracturing, can solve the problems of difficult to control the direction of crack propagation in the hole, difficult to ensure safety, high water pressure, etc. The effect of coal and gas outburst

Active Publication Date: 2012-09-05
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

However, the single-hole hydraulic fracturing method is not easy to control the expansion direction of the cracks in the hole, and requires a high water pressure, and the water pressure is too high, which is difficult to guarantee in terms of safety.

Method used

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  • Porous linear control hydraulic fracturing method
  • Porous linear control hydraulic fracturing method
  • Porous linear control hydraulic fracturing method

Examples

Experimental program
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Embodiment 1

[0016] Embodiment one: if figure 1 As shown, the average thickness of the coal seam in a mine is 1.5m, the average dip angle is 6°, and the hardness of the coal seam is f=2; the immediate roof is light gray medium-grained sandstone with an average thickness of 2.28m; the old roof is gray-black sandy mudstone with an average thickness of 5.33m . Adopt roof directional cutting seam to keep entry along the gob. On the 30m ahead of the working face of the wind tunnel, eight hydraulic fracturing holes 3 arranged in a plane and linear arrangement are constructed one by one by the vertical roof of the side road side of the working face. The diameter of the holes is 32mm, the hole depth is 5m, and the hole spacing is 0.5m. The working face advances in the direction of construction. After the construction of the 8 boreholes, the 8 boreholes 3 are sealed one by one with the hole sealer 4, and the water injection pipelines 7 are connected respectively, and the water injection pipelines...

Embodiment 2

[0017] Embodiment two: if figure 2 As shown, the average thickness of a coal seam in a certain mine is 2.64m, the average dip angle is 2°, and the hardness of the coal seam is f=2.7-3.7; , average thickness 4.24m, hardness f=6.3. The directional hydraulic fracturing technology is used to control the hard roof, and five hydraulic fracturing drilling holes 3 are linearly arranged at an elevation angle of 45° in front of the oblique working face of the coal wall. The drilling diameter is 42 mm, the hole depth is 9.2 m, and the drilling distance is 1m, followed by construction along the direction of the working face. After the construction of the 5 boreholes, use the hole sealer 4 to seal the 5 boreholes 3 one by one, and connect the water injection pipeline 7 respectively, and the water injection pipeline 7 is connected to each borehole 3. Water injection valves 5 are provided at the openings With the pressure gauge 6, five boreholes 3 are connected to the equal flow divider 8...

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Abstract

The invention relates to a porous linear control hydraulic fracturing method. The method comprises the following steps of: conducting hydraulic fracturing drilling on a pre-mined coal-rock mass in a coal mining working face, a transportation lane or a return air lane till the set positions; commonly connecting a plurality of hydraulic fractured holes to a high-pressure water injection pump by adopting an equal-quantity diverter; producing an oval-like water pressure crack band around each hole under the action of pore water pressure; and enabling the water pressure crack bands of the adjacent drilled holes to run through each other by controlling the spacing interval between the drilled holes to realize linear control fracturing. According to the method disclosed by the invention, oriented slitting of a coal-rock layer is realized, and the method has the advantages of being conductive to oriented processing of a hard top plate, fracturing of hard top coal in the vertical direction, oriented transfer of stress, control of rock burst and control of coal and gas outburst, and improving the effect of gas extraction. The method is simple, beneficial for construction convenience, safe, reliable and good in effects, and has extensive practicality.

Description

technical field [0001] The invention relates to a hydraulic fracturing method, in particular to a porous linear control hydraulic fracturing method. Background technique [0002] Hydraulic fracturing technology was first applied in petroleum engineering to increase the production of poor oil wells, and is now widely used in modern coal mining, geothermal resource development, nuclear waste storage and other fields, showing a wide range of industrial application values. With the help of the basic concept of hydraulic fracturing, the research and development of hydraulic fracturing weakening technology for coal and rock mass is one of the key technologies to solve the problem of rock formation control in coal mining. However, the single-hole hydraulic fracturing method is not easy to control the expansion direction of the cracks in the hole, and requires a high water pressure, and the water pressure is too high, so it is difficult to guarantee safety. Since the expansion dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00
Inventor 黄炳香程庆迎陈树亮张统
Owner CHINA UNIV OF MINING & TECH
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