Investigation of the Size Effect of Preformed Particle Gels (Polyacrylamide and Chromium Acetate) on Disproportionate Permeability Reduction

During recent years, various types of gels are used to control excess water in oil wells. The exploiting of preformed particle gels (PPG) can be considered as a good candidate to shutoff water channels without blocking of oil bearing zones. In this research, the preformed particle gel has been synthesized from Sulfonated polyacrylamide copolymer and chromium acetate (III) as crosslinker. The analysis of low amplitude oscillatory shear method was used to study on gel strength, complex viscosity, ultimate storage, and viscous modulus. The complex viscosity and ultimate storage modulus of gel were determined about 5919 Pa.s and 35.4 kPa respectively. The core flooding test was used to study of PPG performance in porous media. Further, two different size particle gels (63-106 and 106-188 micron) were applied to investigate the particle size effect on injection pressure and residual resistance factor of water and oil. The disproportionate permeability reduction index of 3.196 and 4.038, and water residual resistance factor of 41.42 and 53.22 were determined for small and large particle gels respectively. The results showed that the gel particle size on the residual resistance factor of water was more effective than the oil residual resistance factor.