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Method for controlling rock burst by pulse fracturing

A technology of rock burst and pulse, which is applied in drilling equipment and methods, ground mining, earthwork drilling and mining, etc. It can solve the problems of underground space, limited operating conditions, and inability to obtain treatment effects, etc., and achieves low investment cost and high safety. High effect with short space occupation time

Inactive Publication Date: 2012-07-11
河南省煤层气开发利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the measures implemented underground require a lot of engineering, and are limited by the underground space and operating conditions, so good treatment effects cannot be achieved

Method used

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  • Method for controlling rock burst by pulse fracturing
  • Method for controlling rock burst by pulse fracturing
  • Method for controlling rock burst by pulse fracturing

Examples

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Embodiment Construction

[0021] Such as figure 1 As shown, a method for utilizing pulse fracturing to control rock burst is characterized in that the operation steps are as follows:

[0022] Step 1: start drilling from the ground, drill to the stable bedrock layer 10, stop drilling, and run the casing 1 into the ground for cementing;

[0023] Step 2: Drill the well from the stable bedrock layer 10, finish drilling until it enters the coal seam floor, and run the shaft casing 2 into the well for cementing;

[0024] Step 3: Use a perforating gun to perforate around the shaft casing 2 in the coal seam 3 and the coal seam roof section 4 respectively, so that the surroundings of the casing 2 in the coal seam 3 and the coal seam roof section 4 are penetrated to form multiple holes 5 ;

[0025] Step 4: Carry out pulse operation on coal seam 3: first, segment shaft casing 2 in coal seam 3, each section is a coal seam perforation section, and the length of each coal seam perforation section is based on the t...

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Abstract

The invention relates to a method for controlling rock burst by pulse fracturing according to rock stratum stress released by a large number of cracks of a pulse impact rock stratum. The method comprises the following steps of: distributing drill holes from the ground surface to a target layer directly, and acting on a rock stratum through perforation in the mode of repeating high-energy impact waves by using pulses formed by the discharging of an electric pulse device, so that a large number of cracks are generated on the rock stratum, or the original cracks are continuously enlarged to form a pressure relief belt, and the effect of releasing rock burst stress is achieved. By the method, the limitation on limited underground measure implementing space is prevented; and simultaneously, the method is high in operation efficiency and safety coefficient and low in cost and energy consumption.

Description

technical field [0001] The invention relates to a method for controlling rock burst by utilizing a pulse to impact the rock formation to generate a large number of cracks in the rock formation to release the stress of the rock formation. 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 tendency and stress state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16E21C37/18E21B7/20E21B29/00
Inventor 于顺德郭启文林萌史小卫王晓彬张彦起张文勇白新华付江伟孙明闯李凯星
Owner 河南省煤层气开发利用有限公司
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