Interpretation of Coal-Seam Sequestration Data Using a New Swelling and Shrinkage Model
This paper deals with the influence of swelling and shrinkage of coal on the production of methane from, and sequestration of carbon dioxide in, a coalbed reservoir. A three-dimensional swelling and shrinkage model was developed. It is based on constitutive equations that account for coupled fluid pressure-deformation behavior of a porous medium that undergoes swelling and shrinkage. The swelling and shrinkage strains are computed on the basis of the amounts of different gases (e.g., CO2, CH4) sorbed or desorbed. The amounts of sorption and desorption are computed from measured isotherms with the aid of the Ideal Adsorbed Solution model for mixed gases. The permeability of the reservoir is modified according to the swelling-shrinkage model. The paper presents numerical results for the influence of swelling and shrinkage on reservoir performance during injection of carbon dioxide. The paper includes results from a number of examples, and analysis of a field injection into a coal seam at a site in the San Juan basin. Results show that with the incorporation of swelling and shrinkage into the analysis, it is possible to get a better history-match of production data. Results also show that coal swelling can reduce the injection volumes of carbon dioxide significantly. The interpretation of field data with the new swelling-shrinkage model shows that the coal swelling during carbon dioxide sequestration in coal-seams is an important factor that can influence field performance.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 910908
- Report Number(s):
- DOE/NETL-IR-2007-013
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
CARBON DIOXIDE
COAL
COAL SEAMS
DESORPTION
GASES
ISOTHERMS
METHANE
PERFORMANCE
PERMEABILITY
PETROLEUM
PRODUCTION
SHRINKAGE
SORPTION
STRAINS
SWELLING
carbon dioxide injection
carbon dioxide sequestration
coal seams
methane
reservoir performance
shrinkage
swelling