Model of carbonate matrix acidizing: the influence of sediment on dissolution process

Abstract

The present paper represents the results of experiments made with the cores from carbonate formations with sand-alevrolite layers. The experiments showed a strong influence of heterogeneity of the carbonate formation on its flow loss properties during acid treatment of formation. On the basis of the said experiments the averaged model of acid solution of the carbonate matrix was built which takes into account a possible accumulation of sediments. The mathematical model includes the empiric formula to determine the velocity of settled particles concentration and porous rock permeability change. Matching of the model with the real physical process is carried out through comparison of calculated gradient pressure value of the flow with the laboratory data obtained from core experiments.