Study on Polymer Solution Dispersive Premixer for Offshore Platform

For the polymer flooding in offshore oilfields, the mixing performance of the static mixer used for mixing high-concentration polymer mother liquor with high-pressure water greatly affects the oil recovery efficiency. The offshore platform has limited space and load-bearing capacity. To enable the static mixer to efficiently mix high-concentration polymer mother liquor and high-pressure water, a dispersive premixer was developed. Based on the theory of computational fluid mechanics, the fluid flow and mixing in the pipeline were studied through numerical simulation and field test, and compared with the pre-mixing performance of the three-way on the platform. The results of the study show that:high-concentration polymer mother liquor and high-pressure water can be efficiently mixed within 0.60 m of the outlet of the dispersive premixer. The uniformity of polymer solution mixing after the dispersive premixer is added in front of the static mixer on the platform is improved by 14.29%. The dispersive premixer can meet the requirements of polymer flooding for offshore platforms.