A laser drilling and cutting integrated enhanced gas drainage system and method

A gas extraction and laser technology, which is applied in drilling equipment and methods, gas discharge, and earth-moving drilling, etc., can solve the problems of large gas gushing, multi-gas, and gas exceeding the limit.

Active Publication Date: 2019-03-01
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

Although the former can effectively pre-extract coal seam gas and reduce the coal seam gas content below the critical value, there is still a lot of gas in the coal seam, which not only fails to realize the maximum recovery of coal seam gas resources, but also may cause Due to the large gas emission during coal seam recovery, problems such as gas exceeding the limit occurred

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  • A laser drilling and cutting integrated enhanced gas drainage system and method

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Comparison scheme
Effect test

Embodiment 1

[0027] A laser drilling and cutting integrated enhanced gas drainage system is characterized in that it mainly includes a compressed air pipeline 1, a compressed air pipeline valve 2, a laser generator 3, a drilling rig 4, an air slag separator 5, a drill pipe 6, and an orifice Sealer 7, optical fiber 8, drill bit 9, gas extraction pipeline 10 and gas extraction pipeline valve 11.

[0028] The compressed air pipeline 1 is connected with a drilling rig 4 . The compressed air pipeline 1 is equipped with a compressed air pipeline valve 2 . The drilling machine 4 drives the drilling rod 6 to drill in. The drill rod 6 is hollow, ie has an axial channel for receiving the optical fiber 8 . One end of the drill rod 6 is connected to a drill bit 9 . The laser generator 3 is respectively connected to the optical fiber connector II8-1 and the optical fiber connector III8-2 through the optical fiber connector I3-1. Optical fiber connector II8-1 and optical fiber connector III8-2 are r...

Embodiment 2

[0034] This embodiment discloses a laser drilling and cutting integrated enhanced gas drainage method based on the system described in Embodiment 1, which is characterized in that it includes the following steps:

[0035] 1) Connect the optical fiber connector 3-1 and the optical fiber connector 8-1, open the air pressure pipe valve 2, start the drilling rig 4 and the laser generator 3, and the drilling rig 4 drives the drill bit 9 to drill 2m to form a hole on the coal seam or rock wall. During the drilling process, the high-energy laser is emitted from the laser head 9-3 and the laser head 9-4, forming an advanced free surface in the rock mass ahead of the drill bit 9, so as to reduce the drilling resistance of the drill bit 9. The air flow ejected from the injection hole 9-7 carries the cuttings into the gas slag separator 5. At this time, the water mist ejected from the atomizing nozzle 5-1 catches the cuttings, and the air flow enters the gas extraction pipeline 10.

[00...

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Abstract

The invention discloses a laser drilling and cutting integrated intensified gas extraction system and method. In view of the characteristics of high gas content and low gas breathability in coal seamsin China, by combination with the advantages of high laser cutting efficiency and strong directivity, laser cutting is applied to high-efficiency gas extraction of the low-breathability coal seams incoal mines. According to the system, the integrated operation of drilling and coal seam cutting can be achieved, and the construction efficiency is significantly improved; the synergy of pressure relief and thermal driving can be brought into full play; that is, a slit groove formed by laser cutting can effectively relieve confining pressure of the coal body; through a laser-induced high temperature effect, the temperature of the coal body can be significantly increased, the adsorption potential of coal seam gas is reduced, the rapid desorption of gas in the coal seams is promoted, the residual gas content in the coal seams is significantly reduced, and thus the goals of improving gas extraction efficiency of the low-breathability coal seams and effectively preventing and treating gas disaster of the low-breathability coal seams are achieved.

Description

technical field [0001] The invention relates to the technical field of coal mining. Background technique [0002] The permeability of coal seams in my country is mainly distributed at 0.01×10 -15 ~5×10 -15 m 2 In China, the permeability is 1 to 2 orders of magnitude lower than that of coal reservoirs of the same coal rank in foreign countries. Low permeability is one of the main challenges for efficient extraction of coal seam gas in my country. With the extension of coal mining depth, problems such as low gas drainage efficiency and high risk of gas disasters caused by low coal seam permeability have become increasingly prominent. Therefore, enhanced anti-reflection has become one of the key technologies to improve the effect of gas drainage, realize the joint mining of deep coal and gas, and prevent and control gas disasters. [0003] At present, the core ideas of enhanced permeability enhancement methods mainly include: ① gas migration channels in fractured coal struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B3/02E21B10/00E21B10/60E21B43/34E21B43/26E21B17/00
Inventor 邹全乐苏二磊李清淼梁运培张天诚梁金燕李全贵张跃兵李波王法凯
Owner CHONGQING UNIV
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