Adjustable ultra-high pressure water jet cutting device and using method

Abstract

The invention discloses an adjustable ultra-high pressure water jet cutting device. The device comprises a drill bit, an ultra-high pressure fluid pressure conversion device, an ultra-high pressure sealing drill pipe, an ultra-high pressure rotating water tail, a plurality of ultra-high pressure water jets, which are sequentially connected from front to back. High-pressure hose and ultra-high-pressure hydraulic pump station; the ultra-high-pressure sealing drill pipe is driven to rotate and feed by the rotary device on the drilling rig, and a pressure relief regulating valve is installed between the plurality of ultra-high-pressure hoses. The invention also provides a method of using the adjustable ultra-high pressure water jet cutting device. Through the ultra-high pressure fluid pressure conversion device, the invention can rotate the pressure adjusting screw according to the working fluid pressure supplied to the drilling equipment to adjust the reasonable pressure conversion threshold value during low-pressure drilling, and realize the ultra-high pressure during the conventional low-pressure drilling and withdrawal of the drilling equipment. High-pressure slitting increases the width of the slit on the basis of increasing the depth of the slitting slit, increases the range of coal rock pressure relief and permeability enhancement, and realizes the purpose of rapid pressure relief and permeability enhancement in a large range of coal rock.

Description

technical field [0001] The invention relates to the technical field of high-pressure water jet cutting devices, in particular to an adjustable ultra-high pressure water jet cutting device and a method of using the same. Background technique [0002] With the continuous use of new coal mining technologies and equipment, the mining depth continues to deepen to the deep at a speed of about 10-20 m per year, and the deep coal gas dynamic disaster has gradually become the main problem restricting the safe and efficient production of coal mines. The control of coal and rock gas dynamic disasters in deep mines must be carried out from the perspective of coal seam gas extraction up to standard and effective pressure relief. Hydraulic pressure relief and permeability enhancement measures for coal seams have a multiplier effect. Under the condition of deep high stress, medium-hard and hard coal Reaming, pressure relief, and permeability enhancement require a large increase in water je...

AI Technical Summary

Problems solved by technology

Hydraulic reaming, hydraulic slotting, drilling and cutting integration, etc. are widely used as pressure relief and anti-reflection measures. The working pressure of existing hydraulic slotting and hydraulic reaming devices is between 30 and 50 MPa, which is difficult to be effective for coal rocks with relatively high hardness. Cutting; 100MPa ultra-high pressure water jet slotting equipment is also put into use, but the high and low pressure conversion threshold is fixed, the width of the cutting slot is narrow, and the effect of pressure relief and antireflection is not obvious

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