Abstract
To construct ultra-high temperature and salt stable viscosity reducers, viscosity reducers AFOP-n were synthesized and evaluated. These additives were terpolymer of Bisphenol AF, p-hydroxy benzenyl sulfonic acid and Octylphenol ethoxylate synthesized by solution polymerization, and its general molecular structure was confirmed by IR, HNMR and GPC. The polymer AFOP-10 presented good surface activity (30.3 mN/m). Thermal gravimetric analysis showed that the polymer had a very high temperature tolerance, and it was stable up to 340 ℃. Furthermore, the polymer has a high salt resistance in solution. The viscosity values of heavy oil before and after emulsification were 3500 and 62.30 mPa·s, respectively. The viscosity reduction ratio was 98.22% and the water diversion ratio was 75.6% when the salt concentration was 49476 mg/L. Moreover, in the simulated brine system with salinity of 8246 mg/L, AFOP-10 still had good activity after aging at 300 ℃ for 24 h, the viscosity reduction ratio of heavy oil in Bohai Sea remained above 98.5%, and also exhibited better interfacial activity (0.21 mN/m).
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