Ball throwing type high-pressure hydraulic drilling and cutting integrated permeability increasing device and permeability increasing method

Abstract

The invention relates to the technical field of coal seam pressure relief and permeability increasing equipment, in particular to a ball throwing type high-pressure hydraulic drilling and cutting integrated permeability increasing device. The device is characterized in that a drill rod is mounted on a hydraulic drilling machine and driven through the hydraulic drilling machine to axially rotate, adrill bit is fixed to the front end of the drill rod, a high-pressure manifold is connected to the rear end of the drill rod through a rotary joint, the high-pressure manifold is connected with a high-pressure hydraulic power pump station, and is connected with the tail end of the drill rod through the high-pressure rotary joint and used for conveying high-pressure water to the drill bit throughthe high-pressure sealing drill rod, a plurality of water jet nozzles are symmetrically mounted at the handle portion of the drill bit in the radial direction, the outlet pressure of the water jet nozzles is controlled through throwing and non-throwing of sealing balls, and then the functions of low-pressure drilling, medium-pressure reaming and high-pressure slotting are achieved. According to the ball throwing type high-pressure hydraulic drilling and cutting integrated permeability increasing device, integrated operation of drilling advancing and water jet slotting is achieved, and operation procedures are effectively reduced; and in addition, the invention further provides a ball throwing type high-pressure hydraulic drilling and cutting integrated permeability increasing method.

Description

technical field [0001] The invention relates to the technical field of pressure-relieving and seepage-increasing equipment for coal seams, in particular to an integrated technology of high-pressure hydraulic drilling and cutting. Background technique [0002] At present, mine gas control in high-gas mines and outburst mines is mainly to pre-drain the gas in the coal seam through construction drilling, reduce the gas content and pressure of the coal seam, and reduce the amount of gas gushing out of the working face to avoid gas accidents during coal mining. Under the premise of not taking enhanced drainage measures, the diameter of the borehole is the key factor affecting the gas drainage effect of single borehole pre-drainage: the diameter of the hole is small, the diameter of the formed plastic circle is small, and the surface area of ​​the borehole is small, which affects the discharge of gas Speed, the increase of extraction time will affect the efficient mining of the mi...

AI Technical Summary

Problems solved by technology

At present, relevant scientific research institutes have also developed a high-pressure drilling and cutting integrated drill bit based on the principle of high-pressure water throttling, sealing and boosting. It is realized by switching the structure to adjust the pressure of the water pump, and installing a large number of mechanical devices in a limited space affects the applicability and stability of the equipment and limits the development of this technology

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