Gas and Water Production Forecasting Using Semi-analytical Method in Coalbed Methane Reservoirs

Firanda, Eric ¹
(1)PT. Pertamina Geothermal Energy, Jakarta, Indonesia.

This paper presents a method for forecasting gas and water production in coalbed methane (CBM)reservoirs. In this paper, the author developed a semi-analytical method for predicting gas and water production without numerical simulation. This method combined all of reservoir equations such as Langmuir Sorption Isotherm, Material Balance, Darcy’s equation and relative permeability correlation. Iterative method has been developed to predict reservoir pressure throughout production life. The results of this method were compared with numerical simulation results to validate the equation. The proposed method can be applied as sensibility and comparison of reservoir simulation results and reservoir comprehensions of CBM.

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.