SANDSTONE ACIDIZING DESIGN USING A GENERALIZED MODEL.
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Taha et al. previously presented a model for acidizing of sandstone with HF/HCl mixtures in which an organic resin diverting agent was employed. This work has been extended to account for any type of particulate diverting agent and to allow for injection of multiple sequences of acid and diverting agent at either constant rates or constant bottomhole pressure. A general model of diverting agent behavior is developed based on filtration theory. Calculation procedures to determine this parameter from laboratory tests of diverting agents are developed. These tests are either constant rate, constant pressure, or variable rate and pressure experiments; in each case, the specific cake resistance can be extracted from the experimental data. Using these procedures, the efficiencies of various diverting agents can be compared on an equal basis. The sandstone acidizing model is used to design a treatment for a typical Gulf Coast sandstone reservoir.
