IMPACT OF LANGMUIR ISOTHERM ON PRODUCTION BEHAVOIR OF CBM RESERVOIRS
ABSTRACT
Coalbed Methane is an unconventional gas resource that consists of methane production from the coal seams. CBM reservoir performance is also influenced by the interrelationship of reservoir, geologic, and operation parameters. Coalbed methane production performance is considered complex and difficult to analyze especially at the early stages of recovery.
This study was conducted to develop type curves which predict the impact of Langmuir Isotherms on production behavior on a Coalbed Methane reservoir in order to evaluate the economic feasibility and to maximize potential recovery. In order to achieve this objective, the impact of Langmuir isotherm constant on production type curves was studied. Subsequently, a new set of type curves were developed. The type curves can be used to predict the performance of CBM reservoir. However, the value peak gas rate is needed to convert dimensionless gas rate and time predicted by type curves to actual gas rates and real time. Therefore, a correlation between peak gas rate and Langmuir constant was developed.
