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A hole protection device for outburst coal seams and a screen pipe lowering method thereof

A technology for protruding coal seams and protecting holes, which is applied in the direction of earthwork drilling, wellbore/well components, and mining fluids, etc. Efficiency, improve conveying efficiency, solve the effect that is difficult to fix

Active Publication Date: 2021-01-12
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a protruding coal seam hole protection device and a method for lowering the screen pipe, which solves the problem that the screen pipe is easy to get stuck during the transportation process and the top-opening drill bit is not easy to open in the prior art. question

Method used

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  • A hole protection device for outburst coal seams and a screen pipe lowering method thereof
  • A hole protection device for outburst coal seams and a screen pipe lowering method thereof
  • A hole protection device for outburst coal seams and a screen pipe lowering method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, such as Figure 1-5 As shown, a hole protection device for outburst coal seams includes a drilling tool 1, a screen pipe 2, a suspension assembly 3 and a sliding support assembly 4. One end of the screen pipe 2 is threaded with a suspension assembly 3, and the suspension assembly 3 is connected to the drilling tool 1. In cooperation, the suspension assembly passes through the drilling tool and is fixed on the wall of the borehole (that is, the coal wall) for fixing the screen pipe. The sliding support assembly 4 is connected with the screen pipe 2 for supporting the screen pipe. The drilling tool 1 comprises a drill body 1-1 and an auger body 1-2, the auger body and the auger body are hollow bodies, and the front end of the auger body 1-2 is threadedly connected to the rear end of the auger body 1-1, The drill bit body 1-1 is provided with a gradual cutting tooth 1-3 and a movable tooth plate assembly 1-4, one end of the movable tooth plate assembly 1-4 is h...

Embodiment 2

[0033] Example 2, such as Figure 6-7 As shown, a protruding coal seam hole protection device, the suspension assembly 3 includes a suspension cylinder 3-1, the suspension cylinder 3-1 is hollow in the middle, which is convenient for the retraction of the main claw and the aileron claw, and the suspension cylinder 3 The rear end of -1 is provided with a threaded connection for easy connection with the screen. The cylinder wall of the suspension cylinder 3-1 is provided with an opening and closing opening 3-4 and a chute 3-5, and the main wing claw cooperates with the opening and closing opening to facilitate it to be smoothly folded in the suspension cylinder. A sliding shaft 3-6 is arranged in the chute 3-5, and the sliding shaft can slide in the chute. The connecting rod 3-7 is hinged on the sliding shaft 3-6, and the main wing claw 3-1 is hinged in the suspension cylinder 3-1. 2. The main claw 3-2 is hinged with the connecting rod 3-7, and the main claw 3-2 is hinged with ...

Embodiment 3

[0037] Embodiment 3, a screen pipe lowering method for a device for protecting a hole in a protruding coal seam, comprising the following steps: S1: after the drilling construction is completed, the auger rod 1-2 and the drill bit body 1-1 stay in the borehole 5;

[0038] S2: The auger drill rod 1-2 and the drill bit body 1-1 withdraw a certain distance to the outside of the drill hole, and reserve a fixed space for the suspension assembly 3. At this time, the distance H between the drill bit body 1-1 and the bottom of the drill hole 5 =0.5~1.5m.

[0039] S3: Connect the suspension assembly 3 with the screen pipe 2, and transport it to the inside of the borehole 5 through the auger drill rod 1-2 and the drill bit body 1-1; body.

[0040] S4: After the first screen pipe is transported into the borehole, connect the next screen pipe in turn. During the process of connecting the screen pipes, clamp a sliding support assembly 4 on the screen pipe every 10m, and adjust the sliding...

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Abstract

The invention discloses an outburst coal seam hole protecting device and a screen pipe insertion method thereof. The problems that in the prior art, a screen pipe is prone to be stuck in a transportation process, and a jack-type drill is not prone to be jacked are solved. The device comprises a drilling tool, a screen pipe, a suspension assembly and a sliding supporting assembly, wherein the suspension assembly is arranged at one end of the screen pipe, the suspension assembly is matched with the drilling tool, the sliding supporting assembly and the screen pipe are connected, the drilling tool comprises a drill body and a spiral drill rod, the spiral drill rod and the drill body are connected, gradual cutting teeth and a movable toothed plate assembly are arranged on the drill body, spiral blades are arranged on the spiral drill rod, hollow grooves are formed in the spiral blades, the spiral drill rod and the drill body are communicated, and the screen pipe and the suspension assemblyare located in the spiral drill rod and the drill body. The outburst coal seam hole protecting device is ingenious in design and simple in structure, the production cost is reduced, the gas drainageefficiency is improved, the problems of jamming and clamping of a drilling tool in an outburst coal seam drilling process are solved, and not only is the drilling efficiency improved, but also hole collapse is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel drilling devices, in particular to an outburst coal seam hole protection device and a screen pipe lowering method thereof. Background technique [0002] With the expansion of coal mine production scale and the continuous increase of mining depth, mine geological conditions are becoming more and more complex. Outburst coal seams have the characteristics of high gas content and soft coal body. Drilling in outburst coal seams often causes drill sticking and pinch phenomenon. Problems such as short cycle time, small drainage coverage area, and low drilling utilization rate. [0003] At present, the common solution for tunnel drilling is to lower the borehole protection pipe into the borehole to prevent the blockage of the gas drainage channel and improve the utilization rate of the borehole. The technology adopted is to use a large through-hole drill pipe and a drill bit that can be opened. After the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/10
CPCE21B43/103
Inventor 郑吉玉周银波曾珠张瑞林田坤云张文勇
Owner HENAN INST OF ENG
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