Disproportional Permeability Reduction behavior of Hydrogels

The use of gelling system as a diverting and/or blocking agent is widely practiced today to improve production of oil and gas. A hydrogel was prepared by crosslinking of aqueous solutions of sulfonated polyacrylamide/chromium triacetate for use in water shut off operations. The effects of salinity, injection time and flow rate on residual resistance factor (Frr) were investigated. Results showed that oil permeability increased as injection time increased. The results alsoindicated that the effect of gel treatment increased with decreasing of the injection rate. However,when the sand packed was water flooded by formation water, Frrw was decreased by about 49%. According to the results, Disproportionate Permeability Reduction (DPR) was the phenomena that indicated the gel swelling versus injected water and dehydration versus injected oil.

کلیدواژه ها:

Hydrogels ، Coreflood ، Dehydration ، Residual Resistance Factor