摘要 : Injecting a gelation system of a polymer and a cross-linker among available methods to reduce water in petroleum industry is widely used. In this work, a hydrogel was prepared by cross-linking of an aqueous solution of chromium ac... 展开 Injecting a gelation system of a polymer and a cross-linker among available methods to reduce water in petroleum industry is widely used. In this work, a hydrogel was prepared by cross-linking of an aqueous solution of chromium acetate (III) and the copolymer of 2-acrylamido-2-methyl-propanesulphonic-acid sodium salt (AMPS) and acrylamide (PAMPS). The phase diagram of bottle tests showed that the minimum concentration of copolymer for gel formation is 5500 ppm (0.55 wt%). The study of viscoelastic behaviour of hydrogels using dynamic rheometry showed that the storage modulus of the hydrogels increased with increased copolymer concentration and cross-linker/copolymer ratio. At low concentrations of copolymer (5500 and 7500 ppm (0.75 wt%)) there would be no effects on the elastic modulus by increasing the cross-linker/copolymer ratio. Therefore, the effect of copolymer and cross-linker concentrations on the apparent plastic viscosity (η_(p/)) of the gel was investigated. Increasing the solvent ionic power led to decrease in latent gel strength, in which the effect of divalent ions is higher than monovalent ions. A numerical codification for gel strength magnitude is suggested in the range of 10-200 1/s shear rate by using viscometric and bottle test results. The results show that a gel with copolymer concentration of 9500 ppm (0.95 wt%) and cross-linker/copolymer ratio of 1/5 is a suitable gel in terms of gel strength and gelation time. 收起