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

Method for calculating anisotropic absolute permeability of coal

A technology of absolute permeability and anisotropy, applied in the field of calculating the absolute permeability of coal, it can solve the problems of neglecting coal anisotropy, imperfect coal permeability model, lack of relationship between coal matrix adsorption expansion deformation and permeability, etc. , to achieve the effect of improving the accuracy

Inactive Publication Date: 2016-01-20
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the members of the entire coal permeability model family are relatively abundant, which can basically meet the needs of different conditions. However, the existing coal permeability models are not perfect. There are two main problems in the current coal permeability models: anisotropy; the understanding of the relationship between coal matrix adsorption expansion deformation and permeability is still lacking

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
  • Method for calculating anisotropic absolute permeability of coal
  • Method for calculating anisotropic absolute permeability of coal
  • Method for calculating anisotropic absolute permeability of coal

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0012] The method for calculating the anisotropic absolute permeability of coal of the present invention, its preferred embodiment is:

[0013] The model expression is:

[0014] k i = k i 0 { 1 + 1 φ a r e a l i 0 Δσ e j - ...

specific Embodiment

[0034] Model assumptions:

[0035] The free gas in coal is single-phase and saturated.

[0036] The physical processes carried out in coal, such as the adsorption and flow of gases, are carried out under constant temperature conditions. Adsorption and desorption are reversible processes and fit the Langmuir isotherm adsorption equation.

[0037] Coal is a homogeneous elastic medium, and its deformation conforms to Hooke's law.

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 calculating anisotropic absolute permeability of coal. A model expression is defined in the specification. The anisotropic characteristics of coal bodies are considered, so that the precision of coal permeability prediction is improved.

Description

technical field [0001] The invention relates to a method for calculating the absolute permeability of coal, in particular to a method for calculating the anisotropic absolute permeability of coal. Background technique [0002] The coal permeability model has always been a research hotspot and key issue in the field of coalbed methane. In the numerical simulation of coalbed methane exploitation, whether the selected permeability model is appropriate will directly affect the reliability of the simulation results. Sawyer et al. proposed the first semi-empirical permeability model in 1990. Since then, scholars from various countries have begun to explore ways to describe coal permeability changes through theoretical models. In 1998, Palmer and Mansoori proposed the classic P&M permeability model. Since then, the research on coal permeability model has entered the fast lane, and new models have been released continuously. Liu et al., Pan and Connell published a review article i...

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 Applications(China)
IPC IPC(8): G06F19/00
Inventor 王凯臧杰吴雅琴
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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