Coal mine gas pre-extracting drilling flexible hole sealing system and method

Abstract

The invention discloses a coal mine gas pre-extracting drilling flexible hole sealing system and method. The system comprises a hole sealing mechanism, a gas extracting mechanism and a grouting mechanism. The hole sealing mechanism comprises an extracting pipe, a grouting pipe and two pressurizing pipes, all of which are arranged side by side. One end of gas extraction serves as the inner end of agas pre-extracting drilling space, and the other end of gas extraction serves as the outer end of the gas pre-extracting drilling space. A front airbag, a middle airbag and a rear airbag are sequentially arranged in the gas pre-extracting drilling space from outside to inside. The middle airbag is composed of an upper airbag and a lower airbag which are symmetrically arranged up and down. An extracting pipe penetrates through the front airbag and the rear airbag and is clamped between the upper airbag and the lower airbag, one of the two pressurizing pipes sequentially penetrates through thefront airbag and the upper airbag from outside to inside into the rear airbag, and the other of the two pressurizing pipes sequentially penetrates through the front airbag and the lower airbag from outside to inside into the rear airbag. The grouting pipe penetrates through the front airbag and is clamped between the upper airbag and the lower airbag. The method includes the steps of drilling, hole washing, grouting hole sealing and gas extracting. The hole sealing effect can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage, and in particular relates to a flexible hole sealing system and method for coal mine gas pre-drainage drilling holes. Background technique [0002] Coal, as the most important energy in our country, always accounts for about 70% of the primary energy production and consumption structure. However, due to the complex and changeable coal seam occurrence conditions, many gas-containing coal seams, and large coal mine gas reserves, my country's coal industry has been threatened by various natural disasters for a long time, seriously affecting the safe production and sustainable development of mines. Gas disaster is one of the most serious disasters in the process of coal mining. According to statistics in 2006, among the 609 mines of 100 key state-owned coal production enterprises, high-gas mines accounted for 26.8%, coal and gas outburst mines accounted for 17.6%, and low-gas mines ac...

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Problems solved by technology

[0005] However, at present, mining cement grout is often used to seal the hole, including other grouting sealing methods. When the grout solidifies, it cannot seal the new cracks evolved during the extraction process. The use of solidification plugging means sealing the hole. The device will not be recyclable, the sealing material and a large number of pipelines are left in the hole, a large number of sealing devices are basically disposable, and the material consumption is huge

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