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

Abstract

Disclosed is an adjustable gas directional drilling equipment and method for underground soft coal seams in coal mines. The equipment is composed of an orifice mixed gas supply system, a mine-used wired measurement while drilling device, a directional drilling tool assembly, and an orifice waste gas treatment system. Use the orifice mixed gas supply system to provide two optional gases, pressurized air and nitrogen, to the borehole to drive the directional drilling tool assembly to efficiently break rock at the bottom of the hole and discharge cuttings; Drilling real-time measurement and high-efficiency transmission; use directional drilling tool assembly to carry out measurement-while-drilling signal transmission and precise control of drilling trajectory; use the orifice waste gas treatment system to remove drilling slag, ensure safe nitrogen discharge and efficient gas extraction. On the whole, the safety, signal transmission efficiency, and slag discharge efficiency of drilling with gas are improved, and safety hazards such as fire in the hole when drilling with gas 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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