Apparatus and method for gas extraction through complex strata with pipe protection holes

Abstract

The invention relates to the technical field of coal mine safety, in particular to a device and a method for gas extraction through a complex stratum following a pipe protection hole. A power input device and an angle adjustment mechanism are installed on the traveling mechanism, and a center directional drilling assembly is installed on the angle adjustment mechanism. The power input device drives the center directional drilling assembly. The center directional drilling assembly includes drill rods, pilot bits, alloy drill bits, and guide bits. The control assembly, the DTH hammer and the reducing adapter, the front end of the drill pipe is connected with the DTH hammer, the DTH hammer is connected with the guide head control assembly through the reducing adapter, the front end of the guide head control assembly is connected with the pilot bit, and the inside of the pilot bit is An alloy drill bit is provided, the outer hole guard assembly includes a heel tube sleeved on the outside of the drill pipe, the front end of the heel tube is fixed with a tube shoe, the tube shoe is sleeved at the front end of the guide head control assembly, and the inner diameter of the tube shoe is smaller than the middle section of the guide head control assembly maximum diameter.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a device and a method for gas extraction through a complex stratum following a pipe protection hole. Background technique [0002] Coal mine gas is the natural enemy of coal mine safety production. It will not only cause coal mine operators to suffocate and damage human physical and mental health, but also cause coal and gas outbursts, gas and coal dust explosions, and cause mine destruction. main source of pollution. In addition, gas is also an unconventional, high-quality clean energy. [0003] During the mining process of the working face, the gas exceeding the limit often occurs, especially near the upper corner. In addition, because the mine adopts the mining method of fully mechanized top coal caving, there is a lot of residual coal in the goaf, and the residual coal will A large amount of gas is released, and at the same time, the adjacent coal seams, unmined la...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of drilling goaf gas through complex gangue layers between short-distance coal seams, drilling and forming holes is difficult, the present invention provides a device and method for gas extraction through complex formations with pipe protection holes

Images