Preparation of Polymer Solution for Profile Control and Displacement Using Wastewater with High Ca2+/Mg2+ and Fe2+ Concentrations

In the present study, we used Kalamkas, which is a typical Kazakhstani oilfield, produces wastewater with high Ca2+/Mg2+ and Fe2+ concentrations, as case study. We investigated method for preparing polymer solutions without oxygen isolation under conditions of salinity >110 × 103 mg/L, concentration >7000 >30 mg/L. Fe2+-resistant groups were grafted onto molecular chains hydrophobically associating prepared using existing synthesis technology to overcome decrease in apparent viscosity solution due oxidation during preparation. The experiments showed that PAM-IR iron-resistant can be completely dissolved within 180 min, tolerate an NaCl up 0.23 106 Ca2+ 10 Mg2+ 9 90 favorable thickening performance resistances NaCl, Ca2+, Mg2+, Fe2+. has good injection establish resistance factor (FR) residual (FRR) increase sweep efficiency. Therefore, it potentially useful enhancing oil recovery.