Multiphysics of coal-gas interactions: The scientific foundation for CBM production and CO2 storage in coal

Jishan Liu, Zhongwei Chen, Hongyan Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Coal permeability is perhaps the most important parameter for the implementation of primary methane recovery and CO2-ECBM technology. It is well known that sorption-induced strain and thermal gradients have significant influence on permeability change. In this study, a general form of permeability model is developed, which includes the impact from the geomechanical process, coal swelling/shrinkage, gas pressure change, and thermal change. Then it is extended to apply on three different coal mediums: (1) Unfractured coal; (2) Fractured porous coal media; (3) Fractured coal with rigid matrixes. Based on this permeability model, a set of governing equations is built up, which fully couples the geomechanical deformation, gas and heat flow processes. This coupled model is used to evaluate the influence from different media types on permeability evaluation, gas injection and production performance, and the effective stress change around the wellbore. In addition, numerical simulations under both isothermal and non-isothermal conditions are conducted. Significant influence on the permeability evolution, injection and production performance was observed for both cases.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2010, APOGCE 2010
Pages620-635
Number of pages16
StatePublished - 2010
Externally publishedYes
EventSPE Asia Pacific Oil and Gas Conference and Exhibition 2010, APOGCE 2010 - Brisbane, QLD, Australia
Duration: 18 Oct 201020 Oct 2010

Publication series

NameSociety of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2010, APOGCE 2010
Volume1

Conference

ConferenceSPE Asia Pacific Oil and Gas Conference and Exhibition 2010, APOGCE 2010
Country/TerritoryAustralia
CityBrisbane, QLD
Period18/10/1020/10/10

Keywords

  • Coal media type
  • Coal permeability model
  • Coal-gas interactions
  • Sorption-induced strain
  • Thermal influence

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