Study On Efficiency Improvement Of Polymer Flooding Plane Of Secondary Reservoir In Western Block Of North First Block

Based on the development of polymer flooding supporting technology,the secondary oil layer polymer flooding technology can increase the recovery rate to 10%,which is the most mature stabilization succession technology.From the longitudinal layer of the oil layer,the reservoir heterogeneity is poor,the contradiction between the heavier is serious,distinguish from the plane,the plane contradictory is exceptionally prominent.Further development and improvement of the polymer flooding technology is urgently needed.With reservoir streamline description,the sedimentary characteristics of various microfiches sand bodies are studied and divided by 20 units,and the vertical connection and combination relationship of the plane are clarified,which lays the foundation for finding the remaining oil.Utilizing the numerical simulation technology,the study of different deposition and the remaining oil distribution characteristics,to determine the oil and water wells tapping the potential measures,tracking the whole process of polymer flooding development indicators of the layer.The cyclic injection and high and low concentration alternating injection methods were studied,which provided the basis for optimizing the design of single well injection parameters and effectively reducing the dose of polymer dry powder.The remaining oil is mainly concentrated in the west of the block in the western block of north first block?1-9 reservoir,and the western part of the block has high water rate,but the remaining geological reserves are considerable.Based on the physical simulation of oil displacement experiments,one is timely to take stratification measures to reduce the inter-layer interference.Secondly,with the middle and late injection of heavy oil reduce the inefficient ineffective cycle.Thirdly,the thinning layer to take measures to improve the poor layer into the mining capacity,while reducing the differences between the layers to promote oil wells effective.The last,taking the sub-injection to improve the injection parameters and the degree of matching with various types of reservoirs.For improving the potential of the injection area,the following aspects is mainly used,the potential of injection wells dispensing and subdividing,the potential of differential layer injection addition,the potential of injection mode adjustment,and the optimization potential of injection wells after polymer flooding.