Unlock instant, AI-driven research and patent intelligence for your innovation.

Drilling tool for drilling into double-layer inner slag discharge and anti-blocking in soft outburst coal seam and its application method

A double-layer outburst coal seam technology, which is applied in the field of gas drainage drilling in coal mine outburst coal seams, can solve problems such as difficulty in drilling soft coal, greater impact on drilling depth and drilling efficiency, and borehole blockage

Active Publication Date: 2015-11-18
HENAN POLYTECHNIC UNIV
View PDF5 Cites 0 Cited by
  • 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 between the borehole wall and the drill pipe. Therefore, the deformation and damage of the hole wall have a great influence on the change of the slag discharge space, and the borehole is prone to blockage. The depth of the borehole and the drilling efficiency are greatly affected, which is also the root cause of the difficulty in drilling soft coal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Drilling tool for drilling into double-layer inner slag discharge and anti-blocking in soft outburst coal seam and its application method
  • Drilling tool for drilling into double-layer inner slag discharge and anti-blocking in soft outburst coal seam and its application method
  • Drilling tool for drilling into double-layer inner slag discharge and anti-blocking in soft outburst coal seam and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: as 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 seal water supply device or the air supply 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...

Embodiment 2

[0035] Embodiment 2: as Figure 9 to 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

[0036] 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00
Inventor 王永龙孙玉宁王振锋
Owner HENAN POLYTECHNIC UNIV