Investigation of Rheological Properties of Polyacrylamide/Chromium Triacetate Hydrogels Performed for Water Shutoff Treatment in Oil Reservoirs

摘要

In this research, polyacrylamide-based gels were made at 25℃ and aged in an oven at 90℃ for 24 hours. The bottle testing results indicated that gel composed of 15000 ppm partially hydrolyzed polyacrylamide (PHPA) and 2500 ppm chromium(III) acetate exhibited an acceptable strength. The strain sweep test results showed that elastic modulus is fixed on 6Pa below strain of 100%. According to frequency test results, linear viscoelasticity region was observed at the frequency limits from 0.1 to 10 s~(-1). Moreover, elastic modulus decreased from 8Pa at 25℃ to 4 Pa at 90℃. Furthermore, gelation time for gelant with the same composition was obtained (14, 13, and 20 minutes) in sequence.