High-pressure water jet system and method for drilling and enlarging holes on coal bed

Abstract

The invention discloses a high-pressure water jet system for drilling and enlarging holes on coal bed, comprises a high-prerssure water jet system, a drilling machine, a drilling rod and tool system. The high-pressure water jet system includes a water tank, a high-pressure pump, a high-pressure hose connected in sequence, the drilling machine includes a control panel and a machine body, the drilling rod and tool system includes a high-pressure rotation sealing device, a high-pressure sealing drilling rod, a tower-like drill combined of jet mechnical blades with a high-pressure water jet nozzle. According to the invention, drilling and enlarging holes on coal bed is implemented by combination function of rotation cutting of high-pressure water jet to coal of hole bottom and wall, and function of grinding of mechnical blades, which can avoid phenomenon of drilling block and drilling clip during process of drilling holes on coal bed, long drilling holes are formed on soft coal bed with high ground stress, air-conductivity and pressure relief range of coal around drilling holes are enlarged, gas drainage effect and outburst control effect of drilling hoels on coal bed are improved. Additionaly, the invention also discloses a high-pressure water jet method for drilling and enlarging holes on coal bed.

Description

technical field [0001] The invention relates to the technical field of coal mine safety production mining equipment, in particular to a high-pressure water jet coal seam drilling and reaming system and a high-pressure water jet coal seam drilling and reaming method. Background technique [0002] With the development of my country's coal industry and the increasing demand for coal in the national economy, coal production continues to increase. In this way, on the one hand, the existing high gas and coal and gas outburst mines are facing the pressure of increasing production; For outburst coal seams and high gas coal seams, gas drainage is the fundamental measure to prevent outburst and control gas, and drilling gas drainage is a feasible and economical drainage method, which has been more and more widely used . [0003] my country is the country with the most serious coal and gas outburst disasters. According to incomplete statistics, the average number of outbursts per yea...

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Problems solved by technology

[0006] In view of this, the present invention provides a high-pressure water jet coal seam drilling and reaming system and a high-pressure water jet coal seam drilling and reaming method. In the construction of conventional mechanical drilling rigs, it is difficult to drill along the seam and the hole diameter of the coal seam section is small, so as to realize the simultaneous implementation of drilling and reaming in the coal seam, as well as the purpose of drilling and reaming through the seam

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