Perpustakaan Digital ITB

Compounding polymer AP-P4 with high viscosity-reducing Gemini Surfactant HD, which is used as an emulsifier viscosity reduce, to improve the stability of the O/W emulsion while the viscosity reduction rate is kept. A polymeric surfactant emulsification and viscosity reduction system capable of forming a relatively stable O/W emulsion of heavy oil (0.5% HD+0.1% AP-P4) is then compounded. The system has been characterized as a high viscosity reduction rate and high stability. Meanwhile, the production liquid does not need to be added with a demulsifier and only needs to be heated to 70 °C to achieve effective demulsification. The influencing factors of the performance of the polymetric surfactant emulsification and viscosity reduction system were studied. When the oil-water ratio was 70:30 and 60:40, the viscosity reduction rate was 97.47% and 99.09%, respectively; after 15 h at 30 °C, the dehydration rates were 95.8% and 99.2%, respectively. The dehydration rate after 15 h at 70 °C was 98.1% and 99.4%, respectively; at 30 ? 50 °C, the water phase temperature has a greater impact on the viscosity; at 60 °C, 70 °C, the water phase temperature has little effect on the viscosity; as the temperature of the aqueous phase increased, the stability of the emulsion deteriorated. When the aqueous phase temperature was 30 °C, 50 °C and 70 °C, the dehydration rates of the emulsion after 15 h were 95.8%, 96.7% and 98.1%, respectively; As the degree of mineralization increases, the viscosity reduction rate decreases, and the stability of the emulsion deteriorates. The system has been used in field test for 2 injection wells, and the production rate of the two wells increased with a peak value of 25 m3/d and 20?t/d, respectively.