Anti-reflection system and method of high-pressure air pulse water wave periodically hammering coal body

Abstract

The invention relates to the technical field of improvement of the permeability of downhole low-permeability coal seams of coal mines, and discloses a system for improving the permeability of coal bymeans of periodic hammering by the aid of high-pressure air pulses and water waves. The system is characterized in that cracking equipment comprises a high-pressure gas release pipe, a hole sealing capsule and a high-pressure double-layer delivery pipe, the high-pressure double-layer delivery pipe comprises an inner-layer high-pressure double-layer gas delivery inner pipe and an outer-layer high-pressure double-layer water delivery outer pipe, the high-pressure double-layer gas delivery inner pipe is connected with the high-pressure gas release pipe, a plurality of unidirectional gas release holes are formed in the high-pressure gas release pipe, and the hole sealing capsule is arranged on the outer wall of the high-pressure double-layer delivery pipe and is close to the high-pressure gasrelease pipe; a water filling device is communicated with the high-pressure double-layer water delivery outer pipe and can deliver water into cracking holes; an inflating device is communicates with the hole sealing capsule and the high-pressure double-layer gas delivery inner pipe, and can deliver gas into the hole sealing capsule or the cracking holes in a switching manner, and the hole sealingcapsule can be radially expanded to seal holes after being inflated. The invention further provides a method for improving the permeability of the coal by means of periodic hammering by the aid of thehigh-pressure air pulses and the water waves. The method is used with the system for improving the permeability of the coal.

Description

technical field [0001] The patent of the present invention relates to the anti-permeability technology of low-permeability coal seams in underground coal mines, and is a method for intensifying coal seam gas extraction, specifically a high-pressure gas-liquid two-phase mixed pulsation fracturing method. Background technique [0002] The development and utilization of coalbed methane (coalbed methane) can not only increase the supply of clean energy and optimize the energy structure, but also is a fundamental measure to ensure the safe mining of high gassy coal seams in coal mining areas. At present, coalbed methane development in coal mining areas mainly includes surface well development, surface well upper and lower joint development, and underground development. Among them, underground development capacity accounts for more than 80% of the total development volume, and its position is unshakable. [0003] About 42% of the mined coal seams in my country's coal mines are har...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a high-pressure air pulse water wave periodic hammering coal body anti-permeability system, which can solve the problems of high gas flow resistance in low-permeability coal seams, small drainage influence range, short drainage timeliness, low drainage capacity, Problems such as high extraction cost

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