A new theoretical approach to model sorption-induced coal shrinkage or swelling

Shimin Liu, Satya Harpalani

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The shrinkage or swelling of coal as a result of gas desorption or adsorption is a well-accepted phenomenon. Its impact on permeability changes has also been recognized for two decades. Its importance has increased significantly because of the potential of coals that are not likely to be mined and depleted or nearly depleted coalbed methane reservoirs to serve as CO 2 repositories. This article proposes a new theoretical technique to model the volumetric changes in the coal matrix during gas desorption or adsorption using the elastic properties, sorption parameters, and physical properties of coal. The proposed model is based on the theory of changes in surface energy as a result of sorption. The results show that the proposed model is in excellent agreement with the laboratory volumetric strain data presented in the literature during the last 50 yr. Furthermore, the proposed model can be extended to describe mixedgas sorption behavior, which can be applied to enhanced coalbed methane and CO2 sequestration operations.

Original languageEnglish (US)
Pages (from-to)1033-1049
Number of pages17
JournalAAPG Bulletin
Volume97
Issue number7
DOIs
StatePublished - Jan 1 2013

Fingerprint

Coal
swelling
Swelling
Sorption
sorption
coal
coalbed methane
Desorption
desorption
Gases
adsorption
Adsorption
elastic property
Carbon Monoxide
surface energy
Interfacial energy
gas
repository
carbon sequestration
Physical properties

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Geology
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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A new theoretical approach to model sorption-induced coal shrinkage or swelling. / Liu, Shimin; Harpalani, Satya.

In: AAPG Bulletin, Vol. 97, No. 7, 01.01.2013, p. 1033-1049.

Research output: Contribution to journalArticle

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