A. Dadvand Koohi - Chemical Engineering Department, Guilan University, Rasht, Iran
M. Vafaie Sefti - Chemical Engineering Department, Tarbiat Modares University, Jalal Al Ahmad Highway, Tehran, Iran
A. Zarrin Ghalam - Chemical Engineering Department, Tarbiat Modares University, Jalal Al Ahmad Highway, Tehran, Iran
A. Mousavi Moghadam - Oil, Gas and Thermodynamic TMU Research Group, Tehran, Iran
H. Naderi - Center for Exploration and Production Studies and Research Division, Research Institute of Petroleum Industry (RIPI)

A hydrogel was prepared by crosslinking aqueous solutions of sulfonated polyacrylamide/chromium triacetate for use in water shut off operations. Gel swelling and the effects of salinity, injection time and flow rate on residual resistance factor (Frr) were investigated. In the presence of electrolytes, gel swelling decreased by about ۸۰%. Results showed that oil permeability increased as injection time increased. The results also indicated that the effect of gel treatment increased with decreasing injection rate. However, when sand packed was water flooded by formation water, Frrw decreased by about ۲۶%. According to the results, Disproportionate Permeability Reduction (DPR) was the result of gel swelling by water injection and dehydration by oil injection.

Polymer Gel, Sulfonated Polyacrylamide, Swelling, Dehydration, Residual Resistance Factor