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Method for preventing rock burst by adopting high-pressure fracturing

A technology of rock burst and high pressure, applied in the field of high pressure fracturing prevention and control of rock burst, can solve problems such as difficulty in balanced pressure relief, limited space for implementation measures of rock burst prevention, etc., and achieve the effect of eliminating threats and avoiding damage

Active Publication Date: 2015-03-11
河南省煤层气开发利用有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method of directly arranging boreholes from the ground to the target layer and injecting water under high pressure in view of the current situation that it is difficult to balance the pressure relief in the mining process and the space for the implementation of rock burst prevention and control measures is limited. A method of preventing rockburst by high-pressure fracturing that produces a large number of cracks on the roof of the coal seam to achieve balanced pressure relief

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  • Method for preventing rock burst by adopting high-pressure fracturing
  • Method for preventing rock burst by adopting high-pressure fracturing

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Embodiment Construction

[0018] Such as figure 1 , 2 Shown: a method for preventing and controlling rockburst by high-pressure fracturing, characterized in that: its specific steps are as follows:

[0019] Step 1: use the drill bit to drill from the ground to the 15m of the stable bedrock layer 9, and run the ground casing 1 to fix the drilling, that is, cementing;

[0020] Step 2: use the drill bit to drill from the stable bedrock layer 9 to the bottom plate of the coal seam 2 to terminate at 20m, and run the shaft casing 3 to fix the drilling, that is, cementing;

[0021] Step 3: Drill perforations 4 around the casing 3 of the shaft with a perforating gun at the coal seam 2 and the conglomerate layer or the target rock formation 5;

[0022] Step 4: Using ground fracturing equipment, with a pressure of 40-60MPa, the water injection volume is 8-16m 3 / min inject water into the coal seam 2 through the perforation 4 to complete the fracturing of the coal seam 2, and form a coal seam pressure relief z...

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Abstract

The invention belongs to the coal mining field, in particular to a method for preventing rock burst by adopting high-pressure fracturing, which adopts a high-pressure fracturing method to enable a coal seam roof to be fractured to realize pressure relief in a balanced manner and prevent rock burst. A drill hole, a sleeve and a jet orifice are directly distributed from the ground to a destination layer in a designed construction area, water is injected by high pressure, so that the coal seam roof generates a great amount of fractures to realize pressure relief in the balanced manner, and the fracture slots are communicated by fracturing, the original form of rocks is destroyed, and an original stress field is changed and destroyed, an overlying rock is subjected to caving timely along with the progress of a working surface during backstopping, a large-area hanging arch is no longer formed, the damage to a digging space due to caving caused by the large-area hanging arch can be effectively prevented, and threat of rock burst to mining is eliminated.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a high-pressure fracturing method for preventing rock burst by fracturing a coal seam roof to realize balanced pressure relief and preventing rock burst. Background technique [0002] Rock burst is caused by unbalanced pressure relief during mining. A large area of ​​hard rock overlying the coal seam hangs from the roof, and when it collapses, the huge impact force causes the mining space to be destroyed. Therefore, the prevention and control of rock burst must start with balanced pressure relief. [0003] Traditional methods of preventing and controlling rock burst include water injection softening of rock formations, roof drilling and blasting, and mining of protective layers. Water injection softening of rock strata is to change the physical and mechanical properties of the impact coal seam through the physical and chemical effects of water, and reduce the impact tenden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 姜光杰姜锡慧史小卫王晓彬林萌孙明闯张文勇张彦起白新华付江伟李凯星
Owner 河南省煤层气开发利用有限公司
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