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CO2 preparation high-pressure fracturing coal mine gas permeability enhancement and replacement method in coal seam

A gas and fracturing technology, applied in the field of gas permeability enhancement and replacement, can solve problems such as low efficiency of coal seam hydraulic fracturing, and achieve the effects of reducing the harm of coal dust, saving manpower and material resources, and reducing risks

Active Publication Date: 2019-03-12
北京安科兴业科技股份有限公司
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Problems solved by technology

[0007] In view of above-mentioned analysis, the present invention aims to provide a kind of CO in coal seam 2 Preparation high-pressure fracturing gas permeability enhancement and replacement method to solve the problem of low efficiency of hydraulic fracturing in existing coal seams

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  • CO2 preparation high-pressure fracturing coal mine gas permeability enhancement and replacement method in coal seam
  • CO2 preparation high-pressure fracturing coal mine gas permeability enhancement and replacement method in coal seam
  • CO2 preparation high-pressure fracturing coal mine gas permeability enhancement and replacement method in coal seam

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Embodiment Construction

[0048] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0049] In the technical field of anti-permeability and gas replacement of gas-containing coal seams in the coal mining industry, two methods are generally used in the prior art. The first type of hydraulic fracturing method is to pump high-pressure water into the coal seam borehole to cause cracks in the coal seam. However, due to the physical properties of water, most of the cracks will only be relatively large during the hydraulic fracturing process, and the cracks The distribution is very uneven. As a result, the local gas permeability of the coal seam is poor, and the gas is pumped after t...

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Abstract

The invention relates to a CO2 preparation high-pressure fracturing coal mine gas permeability enhancement and replacement method in a coal seam, belongs to the technical field of coal mine gas permeability enhancement and replacement, and aims at solving the existing problem of low hydro fracturing efficiency of the coal seam. The method is characterized in that on the one hand, liquid is adoptedto fracture the coal seam through high pressure to increase the coal mine gas permeability of the coal seam, on the other hand, liquid which is injected into coal through high pressure is taken as aCO2 generating agent, a large amount of CO2 gas can be generated in coal seam gaps, the effects of enhancing coal seam coal mine gas permeability, repelling free coal mine gas and replacing absorbed coal mine gas can be achieved, and the purpose of reducing coal mine gas disasters is finally achieved.

Description

technical field [0001] The invention relates to the technical field of gas permeability enhancement and replacement, in particular to a CO 2 Preparation high-pressure fracturing gas permeability enhancement and replacement method. Background technique [0002] Gases generally exist in coal seams, and a considerable part of them are high-gas and coal and gas outburst coal seams, which are likely to cause disasters such as gas explosions and coal and gas outbursts. At the same time, methane gas is also a high-quality energy resource after extraction and recovery. [0003] There are two forms of occurrence of gas in coal: adsorption state and free state. Adsorbed gas means that gas molecules are tightly adsorbed on coal particles under the mutual gravitational force; free gas is dissociated in the gaps between coal particles in the form of gas. Under certain conditions, adsorbed gas can be converted into free gas. [0004] At present, the traditional method of gas disaster ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/16E21F7/00
CPCE21B43/006E21B43/164E21B43/261E21F7/00
Inventor 刘国磊崔嵛李海洲张晓君姜涛
Owner 北京安科兴业科技股份有限公司
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