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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