Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A multi-component thermal fluid foam displacement coalbed methane mining method

A technology of multiple thermal fluids and mining methods, applied in the fields of mining fluids, earthwork drilling, climate sustainability, etc., to achieve the effects of enhanced desorption capacity, accelerated desorption, and intense thermal movement

Active Publication Date: 2015-09-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A multi-component thermal fluid foam displacement coalbed methane mining method
  • A multi-component thermal fluid foam displacement coalbed methane mining method

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com