Discrepancies in the assessment of CO₂ storage capacity and methane recovery from coal with selected equations of state. Part II. Reservoir simulation

Enhanced Coalbed Methane is a technology that helps mitigate CO2 emissions and at the same time recover methane from coal seams. Usually CO2 in coalbeds is stored under supercritical conditions and adsorption, as a crucial parameter, is responsible for the capacity of coalbed to store CO2. In the first part of this study three equations of state with the same set of experimental data were tested. In this study Langmuir parameters serve as an input data for the reservoir simulator. A sensitivity study for the two sets of Langmuir parameters and two permeability values was performed. Although differences in the results of simulation with Langmuir parameters calculated with PR and SW seem to be insignificant, on a larger field scale these discrepancies can be noteworthy. Improper calculation of sorption data may lead into a significant mismatch with field production.