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Method for coal bed methane mining by multi-element thermal fluid foam displacement

A technology of multiple thermal fluids and mining methods, which is applied in the fields of mining fluids, earth-moving drilling, climate sustainability, etc., to achieve the effects of promoting desorption, increasing production pressure difference, and improving permeability

Active Publication Date: 2013-04-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0002] my country is rich in coalbed methane resources, but the low permeability and adsorption characteristics of coalbeds in my country are the bottlenecks for the development of coalbed methane. Therefore, how to improve the permeability and desorption rate of coalbeds, and then increase the production of coalbed methane is the current development and utilization of coalbed methane in my country. one of the main difficulties

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  • Method for coal bed methane mining by multi-element thermal fluid foam displacement
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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and a coalbed methane well group at the eastern edge of the Ordos Basin as an example, but the implementation scope of the present invention is not limited.

[0015] The CBM well group is a diamond-shaped well pattern, the center well is a vertical well, and the corner wells are directional wells. The average thickness of the encountered coal seam is 8.87m (the vertical depth in the middle of the coal seam is 480m), the average pressure of the coal seam is 3.60MPa, the component content of carbon dioxide and nitrogen in the coalbed methane in this area is 6.8%, and the critical desorption pressure is about 2.5MPa.

[0016] The central well with low current gas production in this well group was transferred to inject, and the reverse five-point injection-production well pattern was adopted for production. The well row spacing was 300m×250m. The injection process of...

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Abstract

The invention discloses a method for coal bed methane mining by multi-element thermal fluid foam displacement. Multi-element thermal fluid is injected into a coal bed of an injection-production well group through an injection well, and foaming agent is injected at intervals. A multi-element thermal fluid foam slug is formed in the coal bed to displace the coal bed methane in order to improve the recovery efficiency of the coal bed methane. The method specifically includes that extracted coal bed methane is compressed and mixed with compressed air, and then the mixture is injected into a multi-element thermal fluid generation device for ignition, extracted processed ground water is mixed to produce the multi-element thermal fluid mainly with high-temperature and high-pressure water vapor and mixed gas of carbon dioxide and nitrogen, the produced multi-element thermal fluid is injected into the underground coal bed through the injection well, a foaming system composed of preferred alkyl ether sulfonate and corrosion inhibitor is injected from an oil jacket annulus at intervals, the multi-element thermal fluid foam slug is formed under the ground to displace the coal bed methane, and water is drained and gas is recovered from a production well. The method has the advantages that fuel is easy to obtain, principles are clear and distinct, and the like, and can provide guidance for implementation of well stimulation of the coal bed methane.

Description

Technical field: [0001] The invention relates to a coal bed gas mining method, in particular to a method for injecting multi-component thermal fluid foam slugs into an underground coal reservoir in a coal bed gas injection well group for displacement to increase the coal bed gas recovery rate. Background technique: [0002] my country is rich in coalbed methane resources, but the low permeability and adsorption characteristics of coalbeds in my country are the bottlenecks for the development of coalbed methane. Therefore, how to improve the permeability and desorption rate of coalbeds, and then increase the production of coalbed methane is the current development and utilization of coalbed methane in my country. one of the main difficulties. In order to improve the permeability of coal seams and increase the recovery rate and production rate of coal bed methane, gas injection displacement coal bed methane technology is one of the most promising coal bed methane stimulation te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/24
CPCY02P90/70
Inventor 冯其红张先敏舒成龙张纪远
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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