Ultra-high pressure water jet slotting system and using method thereof

A water jet and ultra-high pressure technology, applied in drilling equipment and methods, mining fluids, earthwork drilling and mining, etc., can solve problems such as low slotting pressure, limited depth of hard coal rock slots, and unsmooth slag discharge, etc., to achieve Effects of increased fluidity, wide application range, and remarkable application effect

Active Publication Date: 2019-12-27
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydraulic cutting still has problems such as low cutting pressure and limited depth of medium-hard coal seams. Increasing the jet pressure is a direct and effective solution, that is, using ultra-high pressure water jet cutting
At present, there is still no effective device and method for the difficult problem of unsmooth slag discharge in ultra-high pressure water jet slotting

Method used

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  • Ultra-high pressure water jet slotting system and using method thereof

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Effect test

Embodiment 1

[0045] see figure 1, this embodiment discloses an ultra-high pressure water jet slotting system, including an ultra-high pressure water jet generation system, a drill pipe drilling system, an orifice sealer 7 , an air slag separator 14 and a drilling rig 16 .

[0046] The ultrahigh pressure water jet generation system includes an ultrahigh pressure water pump 1 and a nanofluid storage tank 3. A control valve I2 is provided on the high-pressure pipeline between the ultra-high pressure water pump 1 and the nanofluid storage tank 3 . The nanofluid is a two-phase suspension formed by dispersing nanoparticles into water. The mass fraction of nanoparticles is 0.1-1%. The particle diameter of the nanoparticles is 20-80 nm. Nanofluid wettability improves fluidity of coal cuttings.

[0047] The drill pipe drilling system includes a drill pipe 4 , a drill bit 5 and a water braid 8 . The drill rod 4 is a hollow tube as a whole. Two channels I401 are symmetrically arranged on the pi...

Embodiment 2

[0052] This embodiment discloses a method for using the system described in Embodiment 1 for drilling through layers, using a rotary slotting method, including the following steps:

[0053] 1) According to the drilling design requirements for interlayer gas drainage, determine the drilling location and drilling parameters.

[0054] 2) Open control valve I2, control valve II12 and drilling rig 16. The drill pipe 4 drives the drill bit 5 to drill 1-1.5m into the coal rock layer 15 along the designed drilling angle.

[0055] 3) Turn on the water jet generating equipment and raise the water pressure to 40-50 MPa. After 2 minutes, drilling is carried out to make full use of the water hammer pressure to break the coal body. The radial nozzle 501 forms a high-pressure water jet to impact the coal and rock mass in front to form a cylindrical weak surface. The axial nozzle 502 forms a high-pressure water jet to impact the surrounding coal and rock mass, expanding the diameter of the...

Embodiment 3

[0061] This embodiment discloses a method for using the system described in Embodiment 1 for layer-by-layer drilling, which adopts the method of rotary slotting and flat pulling slotting, including the following steps:

[0062] 1) According to the drilling design requirements for bedding gas drainage, determine the drilling location and drilling parameters.

[0063] 2) Open control valve I2, control valve II12 and drilling rig 16. The drill rod 4 drives the drill bit 5 to drill a certain distance in the coal seam along the designed drilling angle.

[0064] 3) Turn on the water jet generating equipment and raise the water pressure to 40-50 MPa. After 2min, implement drilling. Under the combination of the grinding and drilling of the drill bit 5 and the rotary cutting of the water jet containing nanoparticles, the drill rod 4 drives the drill bit 5 to drill and ream the hole. The nanoparticles adhere to the surface of the coal chips formed by the impact of the high-pressure w...

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Abstract

The invention provides an ultra-high pressure water jet slotting system and a using method thereof. The ultra-high pressure water jet slotting system comprises an ultra-high pressure water jet generating system, a drill rod and drill tool system, an orifice sealing device, a gas-slag separator and a drilling machine. The drilling machine clamps the drill rod, drives the drill rod to rotate and drill into a coal and rock stratum. The drill bit rotates around the axis of the drill bit under the driving of the rotation of the drill rod. A nanofluid enters an inner cavity or a channel I of the drill rod through an ultrahigh pressure water pump and a water braid. The nanofluid is fed into the drill bit through the inner cavity or into a channel II through the channel I. A radial nozzle forms high-pressure water jet to impact a coal body in front. An axial nozzle forms a high-pressure water jet to impact surrounding coal bodies. The coal bodies are crushed by the impact of high-pressure water or grinded and crushed by the drill bit. The nanofluid impacts and wets coal dust through the channel II. The ultra-high pressure water jet slotting system can significantly improve the fluidity ofcoal and rock dust and provide power for smooth discharge of the coal and rock dust, and the problems that seriously affect the operation safety, such as hole spraying, hole plugging, drill sticking and the like caused by poor slag discharge are solved.

Description

technical field [0001] The invention relates to the technical field of combined power disaster prevention and control in underground coal mines, in particular to an ultra-high pressure water jet slotting system. Background technique [0002] Studies have shown that the increase in my country's energy demand is still dominated by the increase in coal production. With the rapid increase in the depth of coal mining, the stress in the ground increases significantly, the permeability of coal and rock formations decreases significantly, and gas extraction is difficult. Coal and gas outbursts, Rockburst and compound dynamic disasters are also becoming more and more serious. Permeability enhancement is the key to high-efficiency gas drainage in deep low-permeability coal seams and the prevention and control of coal-rock dynamic disasters, while advance pressure relief is an effective means to prevent rock burst. The unique advantages of hydraulic cutting, such as no wear, no spark, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B7/18E21B7/28E21B10/60E21F7/00
CPCE21B7/18E21B7/28E21B10/60E21B43/26E21F7/00
Inventor 邹全乐张永将张天诚程志恒刘涵李家祺吴斐周俊豪贾雪祺刘彦麟
Owner CHONGQING UNIV
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