Negative decline curves of coalbed degasification wells
Conference
·
· Soc. Pet. Eng. AIME, Pap.; (United States)
OSTI ID:6272977
Production data from coalbed degasification wells characteristically exhibit a negative decline curve. The dynamics of this methane production are complex and interrelated. As production begins, water and free gas are often first recovered. Continued production lowers pressure and increases permeability to gas, allowing adsorbed gas to flow. This pressure drop within the formation causes sublimation whereby gas, which is absorbed within the coal, forms on the walls of the micropores. Finally, the desorption through production disturbs the chemical and physical equilibrium of the coal, thus enabling the coal to resume generation of methane.
- Research Organization:
- Gary C. Harrison, Inc.
- OSTI ID:
- 6272977
- Report Number(s):
- CONF-8405120-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE/DOE/GRI 12874; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
012000 -- Coal
Lignite
& Peat-- Mining
03 NATURAL GAS
030900* -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
ADSORPTION
ALKANES
CHEMICAL PROPERTIES
COAL DEPOSITS
COAL SEAMS
DEGASSING
DESORPTION
DIAGRAMS
DYNAMICS
EQUILIBRIUM
FLUID FLOW
GAS FLOW
GEOLOGIC DEPOSITS
HYDROCARBONS
MECHANICS
METHANE
MINERAL RESOURCES
ORGANIC COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
PRESSURE DROP
PRODUCTION
RECOVERY
REMOVAL
RESOURCES
SORPTION
TIME DEPENDENCE
WALLS
WATER REMOVAL
012000 -- Coal
Lignite
& Peat-- Mining
03 NATURAL GAS
030900* -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
ADSORPTION
ALKANES
CHEMICAL PROPERTIES
COAL DEPOSITS
COAL SEAMS
DEGASSING
DESORPTION
DIAGRAMS
DYNAMICS
EQUILIBRIUM
FLUID FLOW
GAS FLOW
GEOLOGIC DEPOSITS
HYDROCARBONS
MECHANICS
METHANE
MINERAL RESOURCES
ORGANIC COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
PRESSURE DROP
PRODUCTION
RECOVERY
REMOVAL
RESOURCES
SORPTION
TIME DEPENDENCE
WALLS
WATER REMOVAL