Abstract: Due to the limited space on offshore platforms, the large-scale application of polymer flooding technology in offshore oilfields is restricted. Accelerated polymer dissolution is one of the key technologies to support the scaled implementation of polymer flooding in offshore oilfields. To this end, optimization studies have been conducted on factors such as the packing pore size of the enhanced super mass transfer rapid dissolution device, the mass transfer factor, the structure of the mass transfer ring, and the feed rate, in order to obtain the optimal application parameters. The study shows that smaller packing pore sizes and higher mass transfer factors lead to faster polymer dissolution. However, excessively small pore sizes and high mass transfer factors can cause significant viscosity loss. Different combinations of mass transfer rings result in varying degrees of reduction in polymer dissolution time and viscosity loss of the polymer solution. The best mass transfer effect is achieved with a mass transfer ring structure of 300 μm × 1 038 (outer ring) + 200 μm × 1 307 (inner ring). The feed rate has a relatively minor impact on the dissolution time and viscosity of the polymer. The site application results show that after the introduction of the enhanced super mass transfer rapid dissolution device, the dissolution time of polymer mother liquor with a mass concentration of 2 500 mg/L is reduced from 41 minutes to 19 minutes. The footprint of the polymer preparation and injection system is decreased by 50.23%, and the operational mass is reduced by 53.6%. The system has successfully achieved miniaturization and high efficiency, effectively saving platform space. This technology provides a technical guarantee for the efficient application of polymer flooding in offshore oilfields.

Key words: polymer flooding, dissolution rate, super mass transfer technology, offshore platform