Numerical studies on the effects of water presence in the coal matrix and coal shrinkage and swelling phenomena on CO 2-enhanced coalbed methane recovery process

Prob Thararoop, Zuleima Karpyn, Turgay Ertekin

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Conventional coalbed methane (CBM) models are developed using dual-porosity, single-permeability domain characteristics, which ignore the effects of water presence in the coal matrix. Neglecting these effects typically over-predicts gas production. Another phenomenon often disregarded in most CBM models is the coal shrinkage and swelling effects, which cause changes in coal permeability. This study illustrates how the water presence in the coal matrix and coal shrinkage and swelling phenomena affect the CO 2-enhanced CBM recovery process. An in-house two-phase, fully-implicit, compositional, dual-porosity, dual-permeability CBM simulator accounting for the effects of water presence in the coal matrix and coal shrinkage and swelling, is used in this analysis. Results demonstrate the water presence in the coal matrix caused an early CO 2 breakthrough. A decrease in fracture permeability caused by the dominating effects of coal swelling delays the CO 2 breakthrough. Ignoring these effects could provide significant errors of production predictions of enhanced CBM recovery process.

Original languageEnglish (US)
Pages (from-to)47-65
Number of pages19
JournalInternational Journal of Oil, Gas and Coal Technology
Volume5
Issue number1
DOIs
StatePublished - Feb 23 2012

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Swelling
Coal
Recovery
Water
Porosity
Coal bed methane
Simulators
Gases

All Science Journal Classification (ASJC) codes

  • Energy(all)

Cite this

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abstract = "Conventional coalbed methane (CBM) models are developed using dual-porosity, single-permeability domain characteristics, which ignore the effects of water presence in the coal matrix. Neglecting these effects typically over-predicts gas production. Another phenomenon often disregarded in most CBM models is the coal shrinkage and swelling effects, which cause changes in coal permeability. This study illustrates how the water presence in the coal matrix and coal shrinkage and swelling phenomena affect the CO 2-enhanced CBM recovery process. An in-house two-phase, fully-implicit, compositional, dual-porosity, dual-permeability CBM simulator accounting for the effects of water presence in the coal matrix and coal shrinkage and swelling, is used in this analysis. Results demonstrate the water presence in the coal matrix caused an early CO 2 breakthrough. A decrease in fracture permeability caused by the dominating effects of coal swelling delays the CO 2 breakthrough. Ignoring these effects could provide significant errors of production predictions of enhanced CBM recovery process.",
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N2 - Conventional coalbed methane (CBM) models are developed using dual-porosity, single-permeability domain characteristics, which ignore the effects of water presence in the coal matrix. Neglecting these effects typically over-predicts gas production. Another phenomenon often disregarded in most CBM models is the coal shrinkage and swelling effects, which cause changes in coal permeability. This study illustrates how the water presence in the coal matrix and coal shrinkage and swelling phenomena affect the CO 2-enhanced CBM recovery process. An in-house two-phase, fully-implicit, compositional, dual-porosity, dual-permeability CBM simulator accounting for the effects of water presence in the coal matrix and coal shrinkage and swelling, is used in this analysis. Results demonstrate the water presence in the coal matrix caused an early CO 2 breakthrough. A decrease in fracture permeability caused by the dominating effects of coal swelling delays the CO 2 breakthrough. Ignoring these effects could provide significant errors of production predictions of enhanced CBM recovery process.

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