In this research article,a hydrogel was prepared on the purpose of performing a water shut-off process in an oil reservoir.The hydrogel was prepared by using the crosslinking of a partially-hydrolyzed polyacrylamide(PHPA)polymer and zirconium acetate.The tests were conducted to evaluate the effect of various parameters,such as temperature,polymer and crosslinker concentration on the gelation time using the bottle testing method.The effect of temperature on rheological parameters and hydrogel system was also studied.Phase diagram provides the optimum gel formation and effectiveness of optimum gel system was studied through the in-situ gelation and sand pack flooding experiments.The experiments show that the significant permeability reduction of the sand pack cores achieved at reservoir conditions by optimum gel system.Hence,this gel system maybe suitable in water shut-off treatments required for enhanced oil recovery from the oil fields.
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