Coal bed long-hole drilling deposited coal cinder water-discharging system and cinder discharging method

Abstract

The invention discloses a coal bed long-hole drilling deposited coal cinder water-discharging system and a cinder discharging method. The system comprises a box body, a water pump, a drill rod, a drill bit and a rotational flow device; the inlet of the water pump communicates with the outlet of the box body via a pipeline; a port of the drill rod communicates with the outlet of the water pump viaa pipeline and another end of the drill rod stretches into a drill hole; the tail end of the drill bit communicates with another port of the drill rod; a central hole in the head end of drill bit communicates with the inside of the drill hole; the rotational flow device is fixed at the trail end of the drill bit; a high-density water solution is arranged inside the box body; the high-density watersolution is an inorganic salt solution; and the density of the high-density water solution is larger than the density of coal cinder. According to the system and the method, the high-density water solution is used to increase buoyancy of the coal cinder, so the flowing resistance of the coal cinder is greatly lowered; at the same time, the rotational flow device is installed at the tail end of the drill bit, the rotational flow device rotates synchronously when the drill bit rotates, and the driving force for flowing of the high-density water solution can be increased, so the high-density water solution flows towards the outlet of the drill hole more conveniently, the coal cinder is easy to discharged and drill hole drilling is convenient.

Description

technical field [0001] The invention relates to the technical field of coal mine safety engineering, in particular to a long coal seam drilling system and a slag discharge method for water drainage and deposition of coal slag. Background technique [0002] There are more than 2,000 high-gas mines in my country. Among the gas control methods, drilling gas extraction in coal seams is one of the most important means. With the development of drilling construction equipment and technology, long-distance drilling in coal seams, such as the "kilometer drilling rig" drilling technology, has become more and more widely used. At present, the mature kilometer-long drilling depth is more than 800m. However, the trajectory of long-distance drilling in the coal seam is not a ray or a straight line. Due to the influence of the hardness of the coal and rock mass and the self-weight of the drilling tool, the drilling trajectory is a "wave-shaped" continuous undulating trajectory with differe...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to solve the problem that the coal slag is not easy to be discharged in the long-distance borehole in the coal seam, which leads to the difficulty of drilling.

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