The dynamic interfacial tension between HPAM/C17H33COONa mixed solution and crude oil in the presence of sodium halide

The dynamic interfacial tension between crude oil and the partially hydrolyzed polyacrylamide (HPAM)/sodium oleate (C17H33COONa) mixed solution in the presence of sodium halide (NaX: X = F, Cl, Br, I) was investigated by TX500C interfacial tensiometer, and the viscosity of the mixed solution was investigated by DV-iii ultra programmable rheometer. It is shown that the addition of sodium halide results in the lowering of the interfacial tension between HPAM/C17H33COONa system and crude oil. When the concentration of sodium halide reaches 0.50 mol L−1, the minimum interfacial tension can reach the magnitude of 10−4 mN m−1. When the addition of sodium halide varies from NaF to NaCl, NaBr and NaI, the time to reach the minimum interfacial tension becomes shorter and shorter. In addition, NaI has the biggest influence on the decrease of the interfacial tension between HPAM/C17H33COONa system and crude oil. Also it is shown that the addition of sodium halide can decrease the viscosity of the mixed solution, both NaCl and NaI have the same effects.