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Numerical modeling the injection of Super-Critical CO2 in non-dewatered coal bed methane formation
Published in Elsevier B.V.
Volume: 198
Pages: 108 - 208
Dewatering the formation is the conventional methodology used when extracting methane (CH4) from the coal bed formation. A novel approach of not initially dewatering is to be studied. The approach has many advantages regarding the quantity of water produced, ground subsidence, and many more. Proving the latter best over the former requires several steps to be followed. The injection of Super-Critical CO2 (sCO2) is numerically modeled, in a naturally fractured coal bed methane (CBM) reservoir. Part-by- the part influence of each factor on the gas produced and the cleat properties are understood. Eventually, the sorption strain, effective stresses, reservoir compaction, varying overburden, and reservoir temperature, for the purpose, were coupled. The impact of non-isothermal conditions of the reservoir in the non-dewatered formation behavior is significant enough to reframe the conclusions. sCO2 enhances the recovery to 100% from 54% (with no injection) and is an essential application in CH4 production. The injection pressure is selected to sequester it to nearly 100%, assuming no breakthrough. The drainage distance dynamically varies with time as the production of gas proceeds. Flow phases are analysed, from the start, including the transitional effects till either the reserves are 100% recovered or pay zone length reaches. Earlier works relied on the conventional means, and the injected fluid was not the sCO2 to analyse the gas produced. The CO2 injected into the formation exists in supercritical form, which was, so far, ignored in the earlier models. The present study establishes that non-dewatered is a better alternative for the dewatered formation. The production time differs by 30 days. The additional production cost incurred is compensated by reduced water treatment costs. An economic analysis of the operations is required to support the work. © 2020 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Petroleum Science and Engineering
PublisherData powered by TypesetElsevier B.V.
Open AccessNo