A phenomenological model for formation damage in petroleum reservoirs is presented to describe the rock/fluid interaction processes including particle migration, physico-chemical interactions between invading fluid and reservoir rock, and geochemical reactions. Chemical reactions involving dissolution/precipitation and ion exchange are modeled. The precipitates are considered movable and mixed with other fine particles to contribute to the pore throat plugging. Size distribution of both precipitates and clay fines are accounted for by a bimodal distribution function. A probabilistic approach is used to calculate the fraction of the plugged pore throats. The model parameters are determined through an optimization method by fitting with experimental data.

The capability and validity of the model are demonstrated by comparing the predictions obtained from this model with previously published experimental data. The specific case considered addresses the effect of injection fluid composition. The predicted and the experimental data are shown to be in good agreement. This new model has a broader applicability in diagnosis, evaluation, and simulation of formation damage during drilling, production, and EOR processes. It can also be used to predict the performance of acidizing and other chemical flooding processes.

You can access this article if you purchase or spend a download.