A poromechanical model for coal seams saturated with binary mixtures of CH4 and CO2

摘要: Underground coal bed reservoirs naturally contain methane which can be produced. In parallel of the production this methane, carbon dioxide injected, either to enhance or have stored over geological periods time. As a prerequisite any simulation an Enhanced Coal Bed Methane recovery process (ECBM), we need state equations model behavior seam when cleats are saturated with miscible mixture CH4 and CO2. This paper presents poromechanical seams exposed such binary mixtures filling both in porosity matrix. is extension previous work dealt pure fluid. Special care dedicated keep consistent thermodynamically. The fully calibrated mix experimental data numerical from molecular simulations. Predicting variations permeability requires only calibration based on swelling data. With equations, predict numerically how porosity, permeability, adsorbed amounts fluid vary representative volume element isochoric oedometric conditions, as function pressure composition cleats.