Sieve tube drilling process for outburst coal seam section in underground coal mine

A technology for protruding coal seams and processes, applied in the direction of drill pipes, drill pipes, casings, etc., can solve problems such as gas overrun accidents, low safety, and low efficiency, and achieve the goals of improving safety protection, saving construction materials, and reducing costs Effect

Inactive Publication Date: 2014-03-19
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in the existing construction of the roof (bottom) plate through-layer drilling, it is easy to induce gas and coal injection holes, resulting in gas overrun accidents, low safety, and it is necessary to carry out hole protection. sudden, high cost and low efficiency

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  • Sieve tube drilling process for outburst coal seam section in underground coal mine
  • Sieve tube drilling process for outburst coal seam section in underground coal mine
  • Sieve tube drilling process for outburst coal seam section in underground coal mine

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Embodiment Construction

[0029] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] Such as figure 1 As shown, the coal mine underground outburst coal seam segment screen pipe drilling process of the present invention comprises the following steps:

[0031] Preparatory step: calculating the length of the section crossing the outburst coal seam, optionally, the length is calculated according to the required drilling depth, rock layer thickness, inclination angle, and azimuth angle of the roof or floor;

[0032] Hole opening step: After drilling to the depth of the hole through the drilling rig, install the orifice pipe and seal the hole for fixation;

[0033] Simultaneous drilling steps: After drilling to the designed hole dep...

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Abstract

A sieve tube drilling process for an outburst coal seam section in an underground coal mine comprises the following steps: preparation: calculating the length of the outburst coal seam section; drilling: drilling to the hole drilling depth by a drilling machine, mounting an orifice pipe, sealing holes and fixing the orifice pipe; synchronous drilling: adopting a sieve tube drilling rig combination to drill to the designed hole depth, wherein each sieve tube drilling rig comprises an active drill rod and a sieve opening sleeve surrounding the outer side of the active drill rod, and a torque transmission device is arranged between the rear end of the sieve opening sleeve and the active drill rod; withdrawing the drill rod: rotating the active drill rod in the reverse direction by 1-2 turns to enable a torque transmission male connector to be separated from a torque transmission female connector, withdrawing the active drill rod, and leaving the sieve opening sleeve in the outburst coal seam section. After the drilling is performed to the designed hole depth, the active drill rod is rotated in the reverse direction and withdrawn, the drilling process and the sieve tube lowering process are combined, the safety and the efficiency are improved, the cost is reduced, and the problems in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of coal mine drilling, in particular to a screen pipe drilling process for an outburst coal seam section under a coal mine. Background technique [0002] With the gradual deepening of coal mine mining depth and the further expansion of the mining area, the trend of rising gas levels is becoming more and more obvious, and the danger of coal and gas outburst is becoming more and more serious. In order to ensure safe production, top (bottom ) plate through-layer drilling and high-level drilling, etc., in the existing construction of top (bottom) plate through-layer drilling, a large-diameter drill is generally used to form a hole at one time, and then the drill is lifted and lowered into a small-diameter screen pipe After the hole is sealed and solidified, gas drainage is carried out, but this technology has the following defects: [0003] 1. Although measures such as drilling while pumping and orifice sealing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B43/10E21B17/10E21B43/08
Inventor 金新童碧王毅汪金业侯红彭涛王建彬魏宏超
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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