Enhanced Coal Bed Methane Recovery by Gas Injection

This paper is written for UTP’s Final Year Project. The main focus of the paper is on a study on the comparison between primary recovery and enhance coal bed methane recovery in the same reservoir. For enhance coal bed methane recovery, two methods are used which are carbon dioxide injection and nitrogen injection. Using data from Law, Meer and Gunter (2002), simulation using Eclipse 300 simulator is used to simulate the behavior of the reservoir at different production methods. The simulation shows that both enhance recovery method able to obtain high recovery at faster rate compared to only primary recovery. Simulation using DOT.CBM simulator as comparison with Eclipse simulator showed a high agreement between the two simulators. Even though both enhance recovery method able to obtain high recovery, carbon dioxide injection is much more preferable compared to nitrogen injection due to its unique behavior which replace the methane content coal with carbon dioxide until breakthrough.