Pipe-following drilling reaming device for gas extraction holes in soft broken coal bed

Abstract

The invention relates to a pipe-following drilling reaming device for gas extraction holes in a soft broken coal bed to effectively solve the problems that the deep drilling of the gas extraction holes in the soft broken coal bed is difficult to perform and the hole forming effect is poor. The technical scheme for solving the problems is as follows: a drill bit and a drill bit connecting piece are connected together; the drill bit connecting piece is arranged in a casing; a top cap is arranged at the upper end of the casing; a spring is arranged on the drill bit connecting piece in a sleeved mode, and the upper and lower ends of the spring are fixed by a gasket and the top cap respectively; a reaming cutter opening-closing component is arranged in the casing and consists of a pair of scrapers, a mandrel and a cutter pipe; the scrapers are arranged in scraper slots in the casing, and one end of each scraper is connected with the cutter pipe through the mandrel to form a fixed rotary structure; diamond compacts are embedded in the scrapers along the outer boundaries of the scrapers from top to bottom; and the lower end of the cutter pipe and the lower end of the casing are connected with a drill rod connecting piece respectively, and the lower end of the drill rod connecting piece is connected with a drill rod. The pipe-following drilling reaming device disclosed by the invention effectively improves the construction speed of the gas extraction holes, and is an innovation of drilling deices for the gas extraction holes in the soft broken coal bed.

Description

technical field [0001] The invention relates to the field of gas drainage in coal mines, in particular to a drilling and reaming device for gas drainage holes and pipes in soft and broken coal seams. Background technique [0002] For a long time, gas drainage in high-gas mines is the premise of safe and efficient production in coal mines, and is the key factor to realize the maximum economic benefits of mines. At present, gas drainage holes are generally drilled by extending drill bits and drill pipes. After the holes are formed, the gas drainage process is implemented without any treatment. This hole-forming process is more suitable for medium-hard coal seams, but in soft and broken coal seams, it often shows: ①During the drilling process, the drilling stability is poor, the hole wall often collapses before drilling, and the hole-forming quality is poor; ②Due to The wall of the borehole collapses in a large area, the discharge channel of the drilling slag is blocked, the p...

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Problems solved by technology

[0003] In view of the above situation, in order to solve the defects of the prior art, the purpose of the present invention is to provide a gas drainage hole and pipe drilling and reaming de

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