Abstract
El-Gassier, M.M., Omar, A.E., Dahab, A.S. and Awad-El-Kariem, H., 1990. Permeability restoration using inorganic additives. J. Pet. Sci. Eng., 4: 235-243. Three inorganic additives were tested for the restoration of damaged sandstone cores. Hydrochloric acid, aqueous sodium chloride, and aqueous calcium chloride were used on Saudi sandstone cores as well as Berea Sandstone cores. Results showed that concentrated calcium chloride was the most successful of the three additives. Whereas hydrochloric acid was the least successful additive, sodium chloride showed moderate success. Injection with 15% aqueous CaCl2 solution was found to restore most of the damaged permeability characteristics and restored the recovery to its initial pre-damaged level.