Permeability Reduction in Water Sensitivity of Sandstones
A model was developed to describe the rapid decline of permeability of Berea sandstone resulting from its water sensitivity. The model is based on the release and capture of clay particles. The release of clay particles from the pore wall is approximated as a first order decay process and the rate at which particles leave the suspension to plug the pores is assumed to be directly proportional to the particle concentration in the suspension. The resulting equations are solved in conjunction with a semi-empirical relationship relating the local permeability and the amount of clay particles captured to determine the overall permeability of the sandstone core as a function of time. Model predictions are in agreement with experimental observations.
KeywordsPore Wall Clay Particle Overburden Pressure Release Coefficient Permeability Reduction
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