Modelling the Miscible Displacement in CO2-ECBM Using the Convection-Dispersion with Adsorption Model

Guo, R. and Kantzas, A.

DOI: 10.2118/2008-141
CIM 2008-141 presented at the 59th Annual Technical Meeting of the Petroleum Society held in Calgary, June 17-19, 2008.


The convection-dispersion model with adsorption has been used successfully to evaluate adsorption of foam-forming surfactants from core flooding experiments in enhanced oil recovery applications. Mechanisms that determine the transport of CO 2 gas through coal in CO 2-ECBM include convection, dispersion and adsorption. This work attempts to model the CO 2-ECBM process utilizing the convection-dispersion model with adsorption.

A laboratory experiment was conducted to simulate the CH 4 miscible displacement by CO 2 gas using a coal core sample from Alberta Mannville Formation. The effluent gas compositions were monitored by gas chromatography. The transport equation for dispersion and adsorption of CO 2 in coal, considering Langmuir equilibrium adsorption was solved numerically. The results show that the transport of CO 2 in coal resulting from dispersion and adsorption can be modeled successfully. The effects of various properties and process parameters such as porosity, Peclet number, injection gas pressure, and Langmuir parameters on gas adsorption and CO 2 breakthrough were also investigated and discussed.

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