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http://dx.doi.org/10.7842/kigas.2018.22.2.34

A Study on the Conformity Assessment of Type Curve Models to Predict Production Performance in Coalbed Methane Reservoirs  

Kim, Changkyun (Dept. of Energy and Resources Engineering, Chonnam National University)
Lee, Jeonghwan (Dept. of Energy and Resources Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.22, no.2, 2018 , pp. 34-45 More about this Journal
Abstract
The cleat system in coalbed methane (CBM) reservoirs is generally occupied by water which liberated during the coalification process, and behavior of water have influence on CBM production performance. Therefore, it is essential to investigate the effect of the water saturation to operate the degasification process and predict the CBM production performance properly. In this study, type curve analyses were performed on CBM reservoirs under various water saturation to improve the prediction of production performance. A CBM reservoir models with fully-, modestly-, and undersaturated reservoir were built to get production data using GEM by CMG Ltd., and the data were matched with Fetkovich, Palacio-Blasingame(P-B), and Agarwal-Gardner (A-G) type curve. The results showed that undersaturated reservoir was successfully matched by A-G type curve, while the Fetkovich type curve was inappropriate for matching in the late time. The modestly saturated model could be almost corresponded with all the type curve methods at late production period. For the fully saturated model, after peak production had been reached, both P-B and A-G methods showed a proper match to the reservoir production data without long-term production period. Based on the results, merit and demerit of each type curve under specific water saturation were analyzed and listed. Therefore, it is believed that the production data analysis with proper type curve model considering water saturation can be performed to predict accurate production performance.
Keywords
coalbed methane (CBM); type curve; water saturation; production performance;
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