Research on Improved Recovery Method by Composed Synergistic Action of Well Pattern and Tertiary Recovery

摘要

The study takes a field layer as the research object, through numerical simulation technology to establish a theoretical model, select the well pattern which is suited for the synergetic effect of polymer-surfactant flooding and the permeability contrast limits for subdividing layers. On this basis, three sets of well patterns were designed by means of orthogonal design to optimize the factors that affect the surfactant-polymer flooding, including the injection rate, injection-production ratio, slug volume, polymer concentration and surfactant concentration. The results shows that under the different development wells patterns, the pattem adjustment together with the tertiary oil recovery methods to improve oil recovery rate was more than the sum of mere pattern adjustment for water flooding and the compound flooding, reflects the synergetic effect of complex network and tertiary recovery, that is, “Well adjusted+tertiary recovery”, this oil extraction model has played a “1+1＞2”effect.