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Soft outburst coal seam long drill hole forming system and method

A technology for protruding coal seams and long drilling holes, applied in the direction of drill pipes, drill pipes, drill bits, etc., can solve the problems of inability to guarantee construction safety, affect the efficiency of drilling construction, and buried drills, so as to improve construction efficiency and economic benefits, Efficient and smooth drilling operations to ensure the effect of drilling efficiency

Pending Publication Date: 2020-07-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The length of the borehole has an important impact on the gas drainage effect, and as the depth of coal mining increases, the high gas pressure and high ground stress in the coal seam will cause the borehole to collapse, resulting in problems such as injection holes, drill sticking, and buried drill. , the construction safety cannot be guaranteed, which seriously affects the efficiency of drilling construction. At the same time, simply increasing the torque of the drilling rig and the strength of the drill pipe is still not enough to solve this type of drilling problem

Method used

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  • Soft outburst coal seam long drill hole forming system and method
  • Soft outburst coal seam long drill hole forming system and method
  • Soft outburst coal seam long drill hole forming system and method

Examples

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Effect test

Embodiment 1

[0036] see figure 1 with figure 2 , This embodiment discloses a long drilling system for soft and outburst coal seams, including a water jet generation system, a drilling rig drilling tool system, a pressure maintaining system 5 and an air slag separator 7 .

[0037] The water jet generation system includes a booster pump 10 and a nanofluid storage tank 12 . A nanofluid pipeline valve 11 is arranged on the pipeline between the booster pump 10 and the nanofluid storage tank 12 .

[0038]The drilling tool system of the drilling rig includes an auger bit 3 , a drilling rod 4 and a drilling machine 6 . The auger bit 3 is installed on the head end of the drill rod 4 . A helical blade 301 is arranged on the outer wall of the auger bit 3 . The auger bit 3 has an axial channel 304 inside. The top of the auger bit 3 is provided with a high-pressure nozzle 302 for high-pressure water injection. The auger bit 3 communicates with the axial channel 304 . The drilling machine 6 clam...

Embodiment 2

[0044] This embodiment discloses a basic long drilling system for soft outburst coal seams, including a water jet generation system, a drilling rig drilling tool system, a support casing 401 , a pressure maintaining system 5 and an air slag separator 7 .

[0045] The water jet generation system includes a booster pump 10 and a nanofluid storage tank 12 . A nanofluid pipeline valve 11 is arranged on the pipeline between the booster pump 10 and the nanofluid storage tank 12 .

[0046] The drilling tool system of the drilling rig includes an auger bit 3 , a drilling rod 4 and a drilling machine 6 . The auger bit 3 is installed on the head end of the drill rod 4 . A helical blade 301 is arranged on the outer wall of the auger bit 3 . The auger bit 3 has an axial channel 304 inside. The top of the auger bit 3 is provided with a high-pressure nozzle 302 for high-pressure water injection. The auger bit 3 communicates with the axial channel 304 . The drilling machine 6 clamps the...

Embodiment 3

[0050] The main structure of this embodiment is the same as that of Embodiment 2, wherein a one-way valve is provided in the axial channel 304 to ensure that no waste water flows back from the nozzle of the high-pressure nozzle 302 during the drilling process.

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Abstract

The invention provides a soft outburst coal seam long drill hole forming system and method. The system comprises a water jet generation system, a drill tool system, a supporting sleeve pipe, a pressure-retaining system and a gas-slag separator, wherein the drill tool system comprises a spiral drill bit, a drill rod and a drilling machine; the drilling machine clamps the tail end of the drill rod;the supporting sleeve pipe is arranged in the drill rod; the pressure-retaining system comprises a pressure-retaining pipe, a pressure display and a pressure-retaining sealing device; the front end ofthe pressure-retaining pipe stretches into the drill hole and the back end of the pressure-retaining pipe is placed outside the drill hole; and the drilling machine drives the drill rod to rotate anddrills into a coal rock seam. The hole forming method comprises the steps of placing the pressure-retaining pipe, drilling and crushing, pushing the supporting sleeve pipe out of the drill bit and the like. The system guarantees stable pressure in the drill hole and solves the problems of hole collapse, drill burying and the like occurring in long-distance drilling, thereby realizing efficient and smooth drilling operation, utilizing waste water maximally to perform circulating operation and significantly improving construction efficiency and economic benefit.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage, in particular to a system and method for forming long holes in soft and outburst coal seams. Background technique [0002] The length of the borehole has an important impact on the gas drainage effect, and as the depth of coal mining increases, the high gas pressure and high ground stress in the coal seam will cause the borehole to collapse, resulting in problems such as injection holes, drill sticking, and buried drill. , can't guarantee the construction safety, has a strong impact on the efficiency of drilling construction, meanwhile, simply increasing the torque of the drilling rig and the strength of the drill pipe is still not enough to solve this type of drilling problem. [0003] Therefore, in the field of deep coal mining, there is an urgent need for a drilling system and method for high stress and high gas pressure, so as to ensure safe and efficient mining of deep coal re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B21/08E21B21/06E21B17/18E21B10/44E21B10/60
CPCE21B7/18E21B21/08E21B21/065E21B21/067E21B17/18E21B10/44E21B10/60
Inventor 邹全乐张天诚刘莹陈子涵张碧川刘涵王智民王睿智
Owner CHONGQING UNIV
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