Effects of stress-dependent permeability on methane production from deep coal seams
Methane resources are frequently associated with deeply buried coal seams which are also saturated with water; therefore, knowledge of their hydrologic properties is essential. As the formation pressure is lowered during dewatering, permeability may decline by one to two orders of magnitude. Theoretical relationships have been developed which fit laboratory data well for porosity and permeability as a function of effective stress. It was discovered that for practical purposes permeability is a function only of effective stress and the ratio of initial fracture porosity to matrix compressibility (fracture closure pressure). An approximate analytical solution for well testing has been obtained using the model developed. A new method for pump test analysis is then proposed.
- Research Organization:
- In-Situ Inc.
- OSTI ID:
- 6069823
- Report Number(s):
- CONF-8405120-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE/DOE/GRI 12858; Conference: SPE/DOE/GRI unconventional gas recovery symposium, Pittsburgh, PA, USA, 13 May 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
COAL SEAMS
DEGASSING
PERMEABILITY
POROSITY
STRESSES
METHANE
RECOVERY
ANALYTICAL SOLUTION
COMPRESSIBILITY
DEPTH
FRACTURES
HYDROLOGY
PRODUCTION
PUMPING
RESERVOIR PRESSURE
WATER REMOVAL
WATER SATURATION
ALKANES
COAL DEPOSITS
DIMENSIONS
FAILURES
GEOLOGIC DEPOSITS
HYDROCARBONS
MECHANICAL PROPERTIES
MINERAL RESOURCES
ORGANIC COMPOUNDS
REMOVAL
RESOURCES
SATURATION
030900* - Natural Gas- Artificial Stimulation
Plowshare- (-1989)
012000 - Coal
Lignite
& Peat- Mining