Abstract
A critical value of the total ionic strength ( CTIS) has been found to exist for mixed salt solutions flowing in porous media. If the ionic strength drops below this value, significant amounts of fines are released in-situ due to colloidal forces, causing drastic formation damage. For a NaCl/CaCl 2 system, the CTIS is strongly dependent on the relative amount of CaCl 2 present in the solution. The concept of a critical salt concentration ( CSC) and the analysis based on DLVO theory has been extended to mixed salt systems to estimate the CTIS. The difference between critical flocculation concentration ( CFC), and the present definition of CTIS has been pointed out. Predictions of this analysis are consistent with experimental observations.
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