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A liquid nitrogen combined laser cooling and heating alternating gas extraction system and method

A technology for gas extraction and laser extraction, which can be used in gas emission, drilling equipment and methods, mining equipment, etc., and can solve problems such as low permeability and restricting efficient extraction of coal seam gas.

Active Publication Date: 2019-01-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low permeability has restricted the efficient extraction of coal seam gas for a long time.

Method used

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  • A liquid nitrogen combined laser cooling and heating alternating gas extraction system and method

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Experimental program
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Effect test

Embodiment 1

[0029] A liquid nitrogen combined with laser cold and hot alternate drainage gas extraction system is characterized in that it mainly includes a liquid nitrogen tank 1, a pressurized pump 2, a laser generator 3, a drilling rig 4, an air slag separator 5, a drill pipe 6, and a hole Mouth sealer 7, optical fiber 8, drill bit 9, gas extraction pipeline 10, gas extraction pipeline valve 11, compressed air pipeline 12, compressed air pipeline valve 13, tee 14.

[0030] The liquid nitrogen tank 1 is connected to the booster pump 2 on the liquid nitrogen pipeline. The liquid nitrogen pipeline and the compressed air pipeline 12 are respectively connected to an inlet branch of the tee 14 . The outlet branch of the tee 14 is connected with the drilling machine 4 through a pipeline. The compressed air pipeline 12 is equipped with a compressed air pipeline valve 13 . The drilling machine 4 drives the drilling rod 6 to drill in. The drill rod 6 is hollow, ie has an axial channel for rec...

Embodiment 2

[0036] 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:

[0037]1) Connect the optical fiber connector 3-1 and the optical fiber connector 8-1, open the air pressure pipe valve 13, 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 airflow ejected from the drill bit 9 carries 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 drainage pipeline 10 .

[0038] 2) Clo...

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Abstract

The invention discloses a liquid nitrogen joint laser cold-hot alternating methane gas extraction system and method. Aiming at the problems that a liquid nitrogen fracturing coal body is long in melting time and the methane gas extraction efficiency is influenced, based on the basic thought of strengthening methane gas extraction jointly through fracturing and thermal drive, the liquid nitrogen joint laser cold-hot alternating methane gas extraction system and method are provided. The system can achieve integrated work of drilling and coal seam cutting and obviously improve the construction efficiency; the synergistic effect of fracturing and thermal drive can be made full use of, that is, the coal body is firstly quickly frozen and is then sharply subjected to temperature rise, a huge temperature gradient change rate is formed, so that a huge tension shear stress gradient is formed in the coal body, therefore the coal body is efficiently fractured, while the laser inducing high temperature effect can obviously raise the temperature of the coal body, the adsorption potential of coal seam methane gas is lowered, the quick desorption of the coal seam methane gas is promoted, the content of remaining methane gas in a coal seam is obviously lowered, and therefore the purposes of improving the methane gas extraction efficiency of a low breathable coal seam and effectively preventinglow breathable coal seam methane gas disasters are achieved.

Description

technical field [0001] The invention relates to the technical field of coal mining. Background technique [0002] The deep mining of coal resources has gradually become the norm, and the deep gas resources are abundant. How to realize the coordinated mining of these two resources is the key issue for the co-mining of deep coal and gas. Pumping first and then mining has always been the basic principle adhered to in the mining of coal resources in high-gas mines and the prevention and control of gas disasters. However, low permeability has restricted the efficient extraction of coal seam gas for a long time. 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. The gas migration channel in the fractured coal body structure is one of the basic ideas of enhancing permeability. In addition, gas production is a complex process of deso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B3/02
CPCE21B3/02E21B10/00E21B10/60E21B17/00E21B36/001E21B43/26E21B43/34E21F7/00
Inventor 邹全乐张天诚苏二磊梁金燕李清淼李全贵梁运培张跃兵李波王法凯
Owner CHONGQING UNIV
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