This paper describes a unified testing program to identify the best polymer gel systems for a particular field application. Beaker tests are used to rapidly screen gel systems. Coreflood tests are then employed for the final system selection.

Results are presented from a full-scale laboratory evaluation of 15 commercially available polyacrylamide polymers with a Cr(III)-redox crosslinker for profile modification in a thick, multizone reservoir. Beaker tests showed that low levels of polymer hydrolysis were required to produce consistent gels at reservoir conditions. In addition, the pH of the gel solution in the buffered field brine had a large effect on the gel properties. Allied Cglloids Alcoflood ®935L and American Cyanamid Cyanagel ®150 were selected for further evaluation in coreflood tests. Either polymer gel maintained a permeability reduction of at least 97 percent after 50 days of static aging at reservoir conditions. The stability of an Alcoflood 935L gel was evaluated during continuous injection and with exposure to near wellbore pressure gradients.

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