Adjustable gas directional drilling equipment and method for crushed soft coal seam in underground coal mine

Abstract

The invention relates to adjustable gas directional drilling equipment and method for a crushed soft coal seam in an underground coal mine. The equipment is composed of an orifice mixed gas supply system, a mine wired measurement while drilling device, a directional drilling tool assembly, an orifice waste gas treatment system and the like, two optional gas of pressurized air and nitrogen are supplied to a borehole by using the orifice mixed gas supply system, and the directional drilling tool assembly is driven for hole bottom high-efficiency rock breaking and drilling cutting discharging; borehole track while drilling real-time measurement and high-efficiency transmission are conducted by using the mine wired measurement while drilling device; measurement while drilling signal transmission and borehole track precise control are conducted by using the directional drilling tool assembly; and the orifice waste gas treatment system is used for removing boring mud and ensuring safe emission of the nitrogen and high-efficiency extraction of gas. The safety of drilling using the gas, the signal transmission efficiency and the slagging efficiency are overall improved, and potential safety hazards such as fire catching in the hole during gas drilling are avoided.

Description

technical field [0001] The invention relates to the technical field of underground tunnel drilling in coal mines, in particular to an adjustable gas directional drilling equipment and method for underground broken and soft coal seams in coal mines. Background technique [0002] Coal is the main energy source in my country. High gas and gas outburst mines account for about one-third of my country's coal output. Most of the high gas and gas outburst mines have broken and soft coal seams. Gas control in broken and soft coal seams is an important factor affecting the safe production and stable energy supply of coal mines in my country. [0003] Borehole drainage is an effective measure for the prevention and comprehensive utilization of gas accidents in broken and soft coal seams. However, due to the broken coal body in broken and soft coal seams, it is easy to spray holes, collapse holes and drill stuck when drilling, and it is difficult to drill holes along the coal seam; at t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of adjustable gas directional drilling equipment and method for broken and soft coal seams under the coal mine, which can overcome the defects of the prior art and solve the problem of air drill existing in the gas drainage drilling construction of the broken and soft coal seams under the coal mine. There is a risk of coal seam spontaneous combustion, and the special-shaped drill pipe can only be used with the wireless measurement while drilling system, and the wireless measurement while drilling system does not meet the problems of strong vibration and coal seam use environment

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