Experimental study on the effect of polymer concentration and slug size on recovery degree in hyper-permeability reservoir

Abstract

Aimed at the characteristics of high porosity and high permeability reservoir, used the indoor physical simulation method, the experiment of polymer flooding with different polymer concentration and slug size were carried out after water flooding. The effects of polymer concentration and slug size on oil displacement were analysed. The results showed that the optimum polymer concentration was 2200ppm and the optimum polymer slug size was 0.9PV. And polymer concentration and slug size are the decisive factors influencing polymer flooding effect. Under the condition of a certain amount of injection, the higher the polymer concentration, the higher the viscosity of the polymer solution, the greater the reduction range of water content, and the higher the recovery rate of polymer flooding. Under the condition of a certain polymer concentration, the larger the size of the polymer solution slug, the greater the reduction of water content, and the higher the recovery rate of polymer slug flooding.