OIL RECOVERY BY WATERFLOODING EMPLOYING CELLULOSE SULFATE POLYMER FOR MOBILITY CONTROL

摘要

PR-5891 OIL RECOVERY BY WATERFLOODING EMPLOYING CELLULOSE SULFATE POLYMER FOR MOBILITY CONTROL A process for recovering petroleum from a subterranean oil reservoir containing a high percentage of swellable clays wherein production from the reservoir formation is obtained by driving a thickened water solution from an injection well to a production well. The water is thickened with uniformly substituted cellulose sulfate polymer having a degree of substitution of at least 1. The thickened water can be used in conjunction with other injectables such as surfactants to enhance the recovery of oil and control mobility of the injected water.