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http://dx.doi.org/10.7842/kigas.2017.21.2.1

Optimum Design on the Mixed Ratio of Injection Gas with CO2/N2 in Enhanced Coalbed Methane Recovery  

Yoo, Hyun-Sang (Dept. of Energy and Resources Engineering, Chonnam National University)
Kim, Young-Min (Dept. of Energy and Resources Engineering, Chonnam National University)
Lee, Jeong-Hwan (Dept. of Energy and Resources Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.21, no.2, 2017 , pp. 1-9 More about this Journal
Abstract
Enhanced coalbed methane recovery (ECBM), as injecting $CO_2$ or $N_2$ into the coalbed methane (CBM) reservoir for increasing methane recovery, takes center stage in these days. ECBM makes a better recovery than the conventional production method, it called dewatering process. However the characteristics of injection gas affect to methane recovery, thus analysis on the mixed ratio of injection gas should be required. In this study, CBM reservoir model was built to estimate the methane recovery of ECBM method by different mixed ratio of injection gas. Additionally, to consider the characteristics of injection gas such as carbon captured storage, nitrogen re-injection, etc. economic analysis was performed. The results showed that ECBM cases produced methane almost twice as much as dewatering case and $CO_2$ 10% and $N_2$ 90% case resulted in the highest methane recovery among the mixed gas cases. On the other hand, the results of economic analysis showed that $CO_2$ 20% and $N_2$ 80% case made the highest total production profit. Therefore, both the recovery of methane and economical efficiency should be considered to apply ECBM process.
Keywords
CBM; ECBM; Mixed ratio; Methane recovery; Economic analysis;
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