Double-layer internal deslagging and anti-blocking drilling tool for soft and outburst coal seam drilling, and use method of drilling tool

A double-layer outburst coal seam technology, which is applied in the drilling construction field of outburst coal seam gas drainage in coal mines, can solve problems such as difficulty in drilling soft coal, blockage of boreholes, and greater influence of changes in the size of the slag discharge space.

Active Publication Date: 2014-02-05
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used drilling tools, the slagging power is usually fluid slagging and mechanical slagging. Due to the high efficiency of fluid slagging, it is widely used in soft coal seam drilling. Fluid slagging usually enters from the drill pipe cavity. At the bottom of the borehole, the slag discharge space is the annular space betwee

Method used

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  • Double-layer internal deslagging and anti-blocking drilling tool for soft and outburst coal seam drilling, and use method of drilling tool
  • Double-layer internal deslagging and anti-blocking drilling tool for soft and outburst coal seam drilling, and use method of drilling tool
  • Double-layer internal deslagging and anti-blocking drilling tool for soft and outburst coal seam drilling, and use method of drilling tool

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment one: if Figure 1 to Figure 8 As shown, the present invention is a double-layer internal slag discharge anti-blocking drilling tool for drilling into soft outburst coal seams and its use method, including a double-layer internal slag discharge anti-blocking drill pipe 5, a central return drill bit 6, a rotary sealing water supply device or The air supply device 3, the rotary sealing device 3 is connected with the double-layer internal slag discharge anti-blocking drill pipe 5 on the drilling rig, and the central return drill bit 6 is installed on the front end of the double-layer internal slag discharge anti-blockage drill pipe 5. The double-layer inner slag discharge anti-blocking drill pipe 5 is composed of an outer drill pipe body 9, an inner connecting pipe 10 and a porous pipe 11 welded to the inner wall of the inner connecting pipe. The outer drill rod body is made up of an internal threaded joint 12, a rod body 13 and an external threaded joint 14, and...

Embodiment 2

[0036] Embodiment two: if Figure 9 ~ Figure 11 As shown, the difference from Embodiment 1 is that the outer surface of the outer drill pipe body 9 is provided with a helical groove 28, and in the severely contracted area of ​​the drilled hole or the drill hole area, when the drill pipe rotates, the cuttings on the surface of the drill pipe form a spiral conveying state , which is conducive to heat dissipation on the surface of the drill pipe and avoids high temperature of the drill tool caused by heat accumulation. The usage method of the second embodiment is the same as that of the first embodiment.

Embodiment 3

[0037] Embodiment three: as Figure 12 to Figure 14 As shown, the difference with embodiment one and embodiment two is that the outer surface of the outer drill rod body 9 is provided with a helical rib 29, which has the same function as the example two, and simultaneously the helical rib adopts a plasma melting process, which effectively improves the The strength of the outer drill rod body 9 improves the overall strength of the drill rod and indirectly prolongs the service life of the drill rod. The usage method of embodiment three is the same as that of embodiment one and embodiment two.

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Abstract

The invention discloses a double-layer internal deslagging and anti-blocking drilling tool for soft and outburst coal seam drilling, and a use method of the drilling tool. The drilling tool comprises a rotary sealing water supply device or a rotary sealing air supply device, a double-layer internal deslagging and anti-blocking drilling rod and a central backflow drilling bit, wherein the rotary sealing water supply device or the rotary sealing air supply device is connected with the double-layer internal deslagging and anti-blocking drilling rod on a drilling machine, and the central backflow drilling bit is mounted at the front end of the double-layer internal deslagging and anti-blocking drilling rod. The use method of the drilling tool comprises the steps that a drilling system is started; an air flow or a water flow enters an outer layer channel of the double-layer internal deslagging and anti-blocking drilling rod and reaches the bottom of a drilling hole; the air flow or the water flow reverses out drilling cuttings formed by drilling bit coal breaking along an inner layer channel of the double-layer internal deslagging and anti-blocking drilling rod to enter a slag tapping dust collector connected with the tail part of the drilling rod; and deslagging and dust collection are accomplished. The drilling tool is novel in design; the deslagging is accomplished in a cavity of the drilling rod, so that influences of drilling hole shrinkage and hole wall buckling failure on a drilling hole deslagging space can be avoided effectively; the deslagging is accomplished in the inner layer channel of the drilling rod, so that the dust collection is more effective; and drilling, anti-sloughing and dust collection integrated operation is realized.

Description

technical field [0001] The invention belongs to the technical field of gas drainage drilling construction in outburst coal seams of coal mines, and in particular relates to a slag discharge and anti-blocking drilling tool used for drilling in soft outburst coal seams into double-layer inner layers and a use method thereof. Background technique [0002] Mine gas control relies on gas drainage technology. Due to the influence of coal seam geological conditions, the application of safe and reliable surface well drainage is limited. At present, underground gas drainage is still the main measure for gas drainage, while gas drainage is based on pore-forming technology. For a long time, drilling technology in outburst coal seams has been recognized as a difficult gas control problem at home and abroad. Drilling in outburst coal seams is especially difficult in soft coal seams. Affected by ground stress and gas pressure, soft coal drilling shrinks severely, and local instability and...

Claims

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Application Information

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IPC IPC(8): E21B7/00
Inventor 王永龙孙玉宁王振锋
Owner HENAN POLYTECHNIC UNIV
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