Abstract
The injection of carbon dioxide (CO2), a greenhouse gas (GHG), in coal beds is probably one of the more attractive options of all underground CO2 storage possibilities, because the CO2 is stored and the recovery of coalbed methane (CBM) is enhanced at the same time. The revenue of methane (CH4) production can offset the expenditures of the storage operation. Deep, unmineable coal beds are a very attractive geological formations for the storage of CO2. Numerical simulators are useful tools in the development of the GHG storage technology. It is essential to test and evaluate these numerical simulators, to establish their ability to model the complex mechanisms involved. This chapter describes the second part of a simulator comparison study for CO2 storage in coal beds with flue gas injection. The first part of the study was with pure CO2 injection. Two problem sets—one that deals with a single well test with flue gas injection and the other that deals with flue gas injection/enhanced CBM production in an inverted five-spot pattern—have been presented in this chapter along with preliminary simulation results obtained from various numerical simulators. The problems selected for comparison are intended to exercise many of the CBM related features of the simulators that are of practical and theoretical interest.
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