Study On Effect Evaluation And Reservoir Adaptability In Surfactant-polymer Flooding With Profile Control Reservoir

As a new following technique for reservoir to enhance oil recovery for the reservoir with thief zones, SP flooding with profile control now is still in the pilot experiment stage, and the effect evaluation and its reservoir adaptability is still not known. So it is important to evaluate the development effect and to discuss its reservoir adaptability, which can popularize the application and enhance oil recovery.Based on the numerical simulation method, displacement mechanism of SP flooding with profile control is proposed, which includes the synergia of three chemical agents. From the analysis on responding remaining oil distribution, enhanced oil recovery, enhanced oil recovery ratio and the sweep efficiency, it is discovered that the profile control agent has the effect on enhancing oil recovery in the displacement method of SP flooding with profile control. The displacement efficiency of heterogeneous combination flooding is bigger than that of surfactant flooding, also the sweep efficiency is larger than that of gel flooding and polymer flooding. The enchanced oil recovery of heterogeneous combination flooding is larger than the total enhanced oil recovery of the surfactant flooding, the gel flooding and the polymer flooding, which illustrate the synergia of three chemical agents.Based on the existing effect evaluation index, this paper carry on the study of the evaluation methods of chemical flooding effect, which includes the evaluation indexes of injection system and production system.The injection system includes pressure liquid index and hall curve,which can be used to calculated the apparent resistance factor of the injection. The production system includes water production gradient and recovery efficiency multiple, The quantitative relationship between the two evaluation index and enhanced oil recovery are by adjusting the reservoir parameters and development dynamic parameters using numerical simulation technique.Based on numerical simulation techniques, analysis of the static parameters and the development of the dynamic parameters of SP flooding with profile control effect of enhanced oil recovery, which lay the foundation of chemical flooding reservoir conditions. Based on chemical composition analysis and dynamic economic evaluation methods, the effect of the static parameters to internal rate of return is be discussed,and based on which built reservoir adaptability for binary polymer flooding with profile control and binary polymer flooding, this can help guide the high-temperature and high salinity reservoir selective cost-effective development of chemical flooding.