Composite fracturing and uniform permeability increasing equipment for treelike drilling in coal seam of underground coal mine

Abstract

The invention discloses composite fracturing and uniform permeability increasing equipment for treelike drilling in a coal seam of an underground coal mine. The whole equipment can be divided into a hole forming system and a fracturing system. The hole forming system comprises a drilling machine, a drill stem, a drill bit, a support, a water tank, a high-pressure pump, a winch, a propelling mechanism, a chuck, a high-pressure hose, a self-propelled drill bit and the like. The fracturing system comprises the water tank, the high-pressure pump, a pressure meter, a high-pressure rubber pipe, a hole sealing device and the like. The composite fracturing and uniform permeability increasing equipment is suitable for carrying out volume fracturing on the coal seam of the underground coal mine, can reach the effects of carrying out uniform permeability increasing on the coal seam and increasing the gas extraction rate, and is easy to operate and good in economic performance.

Description

technical field [0001] The invention relates to uniform anti-reflection equipment for tree-like drilling composite fracturing of underground coal seams in coal mines, which is suitable for comprehensive anti-permeation enhancement of soft and low-permeable coal seams by volume fracturing methods, and belongs to the technical field of gas control in underground coal mine areas. Background technique [0002] As a kind of unconventional natural gas, gas is the main cause of coal mine safety accidents in my country, and the emission of gas will cause energy waste. Aiming at the problems in the application of conventional gas drainage in high gassy and low permeability coal seams in my country (Wang Yaofeng, He Xueqiu, Wang Enyuan, et al. Research progress and development trend of hydraulic coal seam permeability enhancement technology [J]. Coal Journal, 2014, 39(10) : 1945-1955.), proposed the method of using composite fracturing to uniformly increase permeability. In this metho...

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Problems solved by technology

[0003] The traditional coal mine underground fracturing method is to perform fracturing on the through-layer drilling or the through-layer drilling after cutting. Therefore, the traditional coal mine underground fracturing equipment can only complete the drilling work of the through-layer drilling, and cannot form the above-mentioned methods. Tree drilling, unsuitable for new fracturing methods

And the market research found that the combination of underground fracturing equipment in coal mines at the present stage cannot complete the hole-forming work in the above method. The equipment is designed according to the uniform anti-permeability method of composite fracturing. Referring to the uniform anti-permeability method of composite fracturing, it can achieve a large-scale uniform anti-permeability of the coal seam, and the anti-permeability effect is good

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