A system and method for displacing high-pressure coal seam gas with low-medium pressure air

A coal seam gas and air flooding technology, which is applied in the direction of gas discharge, earth drilling, mining fluid, etc., can solve the problems of gas injection hole sealing that cannot meet the requirements and safety hazards, so as to reduce the gas content, ensure safety, The effect of shortening the pre-drawing period

Active Publication Date: 2016-04-13
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas pressure in high-gas outburst coal seams in my country is generally greater than 1MPa, or even higher than 2MPa, and higher pressure air is needed to displace the gas in high-gas coal mine coal seams. security risks

Method used

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  • A system and method for displacing high-pressure coal seam gas with low-medium pressure air
  • A system and method for displacing high-pressure coal seam gas with low-medium pressure air

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Embodiment

[0034] Embodiment: The sampling device in this embodiment is a sampling valve. as attached figure 1 As shown, a low-medium pressure air displacement high-pressure coal seam gas system is characterized in that it consists of a gas compression system and an air extraction system. The gas compression system includes a main pipeline and a branch pipeline, and a dehumidifier, a booster valve, Gas storage tanks, pressure reducing valves, pressure gauges, throttle valves and flowmeters; the main pipeline penetrates into the sealing section of the gas injection hole in the coal seam; the branch pipeline penetrates into the sealing section of the small hole in the coal seam; the main pipeline and the extraction pipe The gas extraction system includes a drainage pipeline, which is equipped with a sampling valve, a flow meter and a pressure gauge, and two of the drainage pipelines penetrate into the sealing section of the extraction hole in the coal seam.

[0035] Further, there are two...

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Abstract

The invention discloses a low-medium pressure air displacement high-pressure coalbed gas system and a method thereof, which are particularly suitable for high-gas outburst coal seams. A gas injection hole, an extraction hole and a small hole are used for extracting gas in a coal bed; until air displacement coalbed gas starting pressure is reached, low-pressure air in a compressed-air system is injected into the small hole to displace coal body gas of a seal section between a roadway loose circle and the extraction hole; after displacement is performed for a period of time and gas pressure on the front part of the seal section of the gas injection hole reaches displacement pressure, medium-pressure air is continuously injected into the gas injection hole to displace coal body gas farther than the seal section of the gas injection hole, and meanwhile, the small hole is changed from gas injection to extraction to extract dead-angle gas between the seal section of the extraction hole and the seal section of the gas injection hole. According to the system and the method, low and medium pressure air can be used for quickly displacing and extracting the high-pressure gas in the coal bed, pre-draining time for coalbed gas is greatly shortened, and coal is safely recovered in advance; moreover, each component in the system is a nonelectric part, and intrinsic safety in the underground gas injection process is realized.

Description

technical field [0001] The invention relates to a method for displacing gas by air, in particular to a system and method for displacing high-pressure coal seam gas by low-medium pressure air. Background technique [0002] The gas permeability of coal seams in my country is generally low. In order to increase the permeability of the original coal seams, artificial measures are usually taken to strengthen the extraction of coal seam gas, such as hydraulic punching, hydraulic fracturing, hydraulic slotting and loosening blasting, etc., and have achieved certain results. , but due to the complex process, huge equipment, expensive, imperfect equipment and process, easy to induce coal and gas outburst, etc., it has not been widely used in underground mines. [0003] Gas injection displacement is an emerging production stimulation technology, the principle of which is to inject CO into the coal seam 2 or N 2 , with CH 4 Competitive adsorption and reduction of CH 4 Effective part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/16
Inventor 胡胜勇冯国瑞张钰亭李振
Owner TAIYUAN UNIV OF TECH
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