Drilling-cutting-linked coal layer gas drainage and outburst prevention system and method based on ultra-long drilling and high-pressure water jetting

Abstract

The invention discloses a drilling-cutting-linked coal layer gas drainage and outburst prevention system and method based on ultra-long drilling and high-pressure water jetting. The system comprises a drill bit, a pressure sensing valve, a drill stem, a drill machine, a high / low-pressure water delivery and rotation device, a high-pressure pump and a water tank, wherein the pressure sensing valve is mounted at the front end of the drill stem; the drill bit is mounted at the front end of the pressure sensing valve; a nozzle is mounted at the outer side of the pressure sensing valve; the drill machine drives the drill stem to rotate; and water in the water tank is delivered to the high / low-pressure water delivery and rotation device through the high-pressure pump, input to the drill stem through the high / low-pressure water delivery and rotation device and delivered to the pressure sensing valve through the drill stem. In the drill withdrawing process, the coal layer is cut by the high-pressure water, thereby realizing the drilling-cutting linkage and improving the working efficiency. The invention is simple and delicate in structure; and by using the invention, the cutting diameter can be up to 3 meters or above, thereby increasing the gas exposure area to more than 6 times of the traditional gas exposure area and effectively widening the gas release range by more than 3 times. Thus, the invention solves the drainage and outburst prevention problems of coal mine gas.

Description

technical field [0001] The invention discloses a coal seam gas drainage and outburst prevention system and method, in particular a coal seam gas drainage and outburst prevention system and method with long borehole high-pressure water jet drilling and cutting linkage. Background technique [0002] Coal is an important energy source in people's daily life and plays an inestimable role in people's production and life. The current coal is collected from coal mines. In the process of coal mining, because there is gas in the coal seam, the drainage of gas and the prevention of coal and gas protrusion are particularly important in the process of coal mine drilling. Important, if the gas drainage cannot be carried out well, there will be hidden dangers of production accidents, which will easily lead to production accidents. Therefore, gas drainage is necessary before coal mining. At present, the gas drainage commonly used in coal mines is carried out by drilling technology, that ...

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Problems solved by technology

[0003] Aiming at the shortcomings of poor drainage effect in the coal mine gas drainage system in the prior art mentioned above, the present invention provides a new gas drainage method and system, which drills the hole to the set position and then In the process of withdrawing the drill, high-pressure water is sprayed intermittently, and the coal seam is rotated and cut to expand the gas drainage area

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