The research on the change of the development Index in high concentration polymer after polymer flooding

摘要

In order to study the change principle of development biddingafter polymer flooding, the coefficient of drag and residual resistance factorare measured by flow test, and the reasonable injection rate is obtained by the injectability evaluation experiment. Oil displacement experiment is carried out in different types of wellsin large scale simulation physical model of high molecular weight polymer with relative molecular weight of 25 million, the results show that the reconstruction of well pattern can greatly reduce the residual oil saturation and ease the pressure of injection continued rise; with the concentration of polymer flooding increases, the conformance efficiency of middle and low permeability layerare improved; after the reconstruction of well pattern, the remaining oil located near the diversion line and the original oil well get utilized, displacement characteristicshas improved significantly.