Broken soft coal seam gas extraction bedding directional drilling screen pipe tripping-in device and method

Abstract

The invention discloses a broken soft coal seam gas extraction bedding directional drilling screen pipe tripping-in device and method.The device comprises a directional drilling tool string and a screen pipe drilling tool string, and the directional drilling tool string comprises a drilling rod, an electromagnetic wave measurement while drilling device, a bent pipe and a drilling bit which are sequentially connected; the screen pipe drilling tool string comprises a tripping-in pipe and a screen pipe which are sequentially connected, and a screen pipe front end positioning head and a screen pipe tail end positioning head are installed at the front end and the rear end of the screen pipe respectively. The device and the method solve the problems that an existing device and method cannot determine the drilling position of the screen pipe and cannot achieve full-hole-section screen pipe feeding, the drilling track can be measured in real time in the screen pipe feeding process, the screen pipe feeding position can be accurately judged, the screen pipe feeding direction can be dynamically adjusted, drilling full-hole-section screen pipe feeding is achieved, the hole section length is effectively protected, and the drilling efficiency is improved. And the broken soft coal seam gas extraction effect can be improved.

Description

technical field [0001] The invention belongs to the field of coal mine gas control, and in particular relates to a device and method for lowering bed-oriented directional drilling screen pipes for gas drainage in broken soft coal seams. Background technique [0002] The development of drilling technology for gas drainage of broken soft coal seams in coal mines has experienced hydraulic slag discharge drilling technology, medium wind pressure wide-blade helical drill pipe drilling technology, triangular drill pipe drilling technology, high-speed helical drilling technology Technology and air casing drilling technology have increased the depth of bedding-drilled holes in broken soft coal seams to about 200m. However, these technologies use rotary drilling technology for drilling construction, the drilling trajectory cannot be monitored and controlled while drilling, the coal seam drilling rate is low, and the drilling depth is shallow, and the gas drainage efficiency needs to ...

AI Technical Summary

Problems solved by technology

[0004] According to the existing technology, when drilling protection holes along the broken and soft coal seams, the exact position of the screen pipe running cannot be judged, the accurate running of the main hole to the branch hole, or the branch hole to the main hole cannot be realized, and the full drilling of the drill hole cannot be realized. The screen pipes in the hole section are lowered, the hole section of the screen pipe protection hole is short, and the gas drainage efficiency is low. The designer of the present invention has devoted himself to research and design, and integrated the experience and achievements of related industries to propose a broken soft coal seam The device and method for running the screen with layered directional drilling for gas drainage can realize the measurement of the drilling trajectory while drilling during the running of the screen, accurately judge the position of the screen, and at the same time can complete the main hole to the branch hole, or Accurate running of the branch hole to the main hole realizes the running of the screen pipe in the whole hole section of the borehole, which effectively protects the hole for a long time and improves the gas drainage volume and efficiency

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