Behavior of coal-gas reservoirs. [7 refs]
Technical Report
·
OSTI ID:7254029
Gas occurs in coalbeds in an adsorbed and a free gas state. Adsorbed gas is stored in the micropore structure and its transport is governed by Fick's law. The free gas occurs in the fracture system and flows according to Darcy's law. These two modes of mass transport are interdependent. Production decline curves of coal-gas wells are of the constant percentage decline type and, thus, show no indications of flow characteristics peculiar to coal-gas reservoirs. The effectiveness of surface boreholes as a degasification scheme depends upon both good fracture permeability and a high fracture density. Conventional methods of reservoir engineering analysis are not applicable to coalbeds.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA)
- OSTI ID:
- 7254029
- Report Number(s):
- BM-TPR-10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
ADSORPTION
ALKANES
BOREHOLES
CARBONACEOUS MATERIALS
CAVITIES
COAL
COAL DEPOSITS
CRYOGENIC FLUIDS
DARCY LAW
DEGASSING
EFFICIENCY
ENERGY SOURCES
FICK LAWS
FLUIDS
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
HYDROCARBONS
MASS TRANSFER
METHANE
ORGANIC COMPOUNDS
POROSITY
RESOURCES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
010600 -- Coal
Lignite
& Peat-- Properties & Composition
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
ADSORPTION
ALKANES
BOREHOLES
CARBONACEOUS MATERIALS
CAVITIES
COAL
COAL DEPOSITS
CRYOGENIC FLUIDS
DARCY LAW
DEGASSING
EFFICIENCY
ENERGY SOURCES
FICK LAWS
FLUIDS
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
HYDROCARBONS
MASS TRANSFER
METHANE
ORGANIC COMPOUNDS
POROSITY
RESOURCES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES