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Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture

A technology for hydraulic fracturing and gas drainage, which is applied in the directions of gas discharge, earthwork drilling, safety devices, etc., can solve the problems of poor gas drainage effect and the lack of uniform fracturing treatment of single-hole hydraulic fracturing coal body.

Active Publication Date: 2009-11-18
CCTEG SHENYANG RES INST
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical deficiency that single-hole hydraulic fracturing coal cannot be treated uniformly and the effect of gas drainage is very poor, the present invention provides a method for gas drainage of loose coal body through bed drilling hydraulic fracturing

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  • Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture
  • Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture
  • Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture

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Embodiment Construction

[0019] Figure number

[0020] In the figure 1. Coal seam, 2. Control drilling, 3. Hydraulic fracturing drilling, 4. Self-sealing hole sealing device, 5. Hydraulic fracturing water injection pipe, 6. Shimen coal mining face, 7. High-pressure water pump, 61 .Slate lane at the bottom of the coal seam, 62. Slate lane at the top of the coal seam.

[0021] figure 1 . In the first embodiment shown, a method for gas drainage of loose coal body by hydraulic fracturing through bed drilling, including drilling hydraulic fracturing drilling 3 into coal seam 1 in coal seam floor rock roadway 61, characterized in that hydraulic fracturing After drilling four control boreholes 2 around the borehole 3, hydraulic fracturing is performed from the hydraulic fracturing borehole 3. The length of the hydraulic fracturing borehole 3 entering the coal seam is greater than half of the thickness of the coal seam 1, and the rock section of the hydraulic fracturing borehole 3 should be kept smooth and...

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Abstract

The invention discloses a gas drainage method for loosening a coal body through cross layer boring and hydraulic fracture, which comprises the step of boring a hydraulic fracture borehole to a coal layer in a laneway. The method is characterized in that after a plurality of control boreholes are bored on the periphery of the hydraulic fracture borehole, the hydraulic fracture borehole is subjected to hydraulic fracture, the laneway can be rock lane and also can be coal lane, the length of the hydraulic fracture borehole entering the coal layer is greater than one half of the thickness of the coal layer, and both the hydraulic fracture borehole and the control boreholes can be used as gas pumping boreholes. The method has the beneficial effects that a certain number of control boreholes are bored on the periphery of the hydraulic fracture borehole, the coal body in certain distance of the periphery of the hydraulic fracture borehole generates a compression-resistant weak area when the fracturing range reaches the control boreholes, high-pressure water can press through the coal body between the hydraulic fracture borehole and the control boreholes, and continuously fracture the coal body, and simultaneously the high-pressure water takes out coal slacks from the control boreholes, so the high-pressure water has the function of loosening the coal body at the same time of fracturing so that the ground stress is reduced and the hydraulic fracture and gas pumping effects are improved.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas drainage, in particular to a hydraulic fracturing method for coal seam gas drainage. Background technique [0002] Hydraulic fracturing technology is a method of pressure relief and drainage of coal seam gas. There are two main methods for hydraulic fracturing to enhance drainage of coal seam gas: ① surface drilling and hydraulic fracturing for drainage of coal seam gas. The coal seam for ground drilling hydraulic fracturing should be extremely easy to drain, with a thickness of medium thickness or above, and an inclination angle of gentle or inclined coal seam. After hydraulic fracturing is implemented in coal seams that are difficult to drain gas, the general effect is very poor; ② Downhole hydraulic fracturing drilling method for coal seam gas drainage. The method of underground hydraulic fracturing drilling for coal seam gas drainage is basically the same as that of surface drilling hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
Inventor 王魁军富向曹垚林张兴华沈维栋王宇鹍李江涛聂永兴刘晓辉
Owner CCTEG SHENYANG RES INST
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