An axially balanced slotting pressure relief and anti-reflection device for gas drainage drilling

Abstract

The invention beLongs to the technicaL fieLd of coaL-mine gas extraction and reLates to an axiaL baLance grooving pressure-reLief permeabiLity improvement device for gas extraction driLLing. The device is suitabLe for axiaL grooving permeabiLity improvement operation for high-gas Low-permeabiLity coaL-bed extraction driLLing. The axiaL baLance grooving device comprises a baLance device mechanism and a supporting mechanism with a spray nozzLe, dynamic baLance can be achieved under the effect of an eccentric baLance shaft and the supporting mechanism, and the spray nozzLe and the supporting mechanism are kept in the same horizontaL direction. The device has the advantages that it is guaranteed that high-pressure water jetting fLow is aLways used for conducting grooving seam buiLding on surrounding coaL in the predetermined direction, a seam groove in the axiaL direction of a driLLing hoLe is formed, the pressure-reLief permeabiLity improvement aim is achieved, and the probLems are soLvedthat an existing hydrauLic grooving device cannot conduct axiaL grooving seam buiLding aLong the driLLing hoLe in the fixed direction, and the pressure-reLief permeabiLity improvement effect is poor.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and relates to an axially balanced grooving pressure relief and anti-reflection device for gas drainage boreholes, in particular to a shaft suitable for high gas and low permeability coal seam drainage boreholes. Slotted anti-reflection device. Background technique [0002] Coal mine gas (coal bed methane) is one of the main causes of coal mine safety accidents, and coal mine gas (coal bed methane) is also a high-quality clean energy. High gas and coal and gas outburst mines account for a relatively large proportion in my country. Scientific and rational mining and utilization of coal mine gas is not only conducive to improving the safety level of coal mines, but also conducive to optimizing the energy structure and protecting the ecological environment. Therefore, coal mine gas (coal bed methane) drainage is a technology that integrates safety, energy and environmental protec...

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the problem that the existing hydraulic technology grooving and grooving device cannot achieve precise grooving and grooving in a specific direction along the axial direction of the borehole, and the effect of pressure relief and anti-reflection is not good, the present invention provides a Axial Balance Cutting Pressure Relief and Antireflection Device for Gas Drainage Boreholes

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