Research On The Effect Of Vertical Heterogeneity Of Reservoir On Oil Displacement Efficiency

At present, the situation of oil exploitation, the use of different flooding technology for oil and gas development is the main way of oil extraction in our country, and the displacement agent directly determines the oil recovery level for crude oil displacement, therefore, to maximize improve oil displacement efficiency has been the center of gravity of the oil and gas development research.Displacement efficiency affected by many factors, such as complexity and variability of the storage layer macro and micro structure, the choice of displacement agent and the way of driving oil and the working system of injection and production process. These factors for the description of remaining oil distribution and guidance of remaining oil potential has an important guiding role. In this paper, the effec t of vertical heterogeneity on oil displacement efficiency is studied.In this paper, single factor method and multi- factors method are used to study vertical heterogeneity, and multi- factors method includes AHP and entropy weight methods, these methods are used as comprehensive evaluation index of the heterogeneity of the reservoir. Principles and methods of reservoir engineering, physical model test method, numerical simulation analysis method s are used to study the impacts of vertical heterogeneity on oil displacement efficiency is studied. Through the description of oil player on the stage of high water cut of water flooding, then applied the methods of reservoir engineering and numerical simulation to study the water flooding process heterogeneity multi- layer reservoir sandstone reservoir of S Oil Field, the subdivision and recombination of layers must be used to reduce the impacts of vertical heterogeneity. Through the description of SAGD of heavy oil reservoir, then applied the methods of reservoir engineering to theoretically analyses the displacement process, and use the numerical simulation method to simulate the impacts of the heterogeneity of L O il Field on SAGD development, and descript the influence of the upscaled geological model imported into software and the influence of the interlayer to the development of steam chamber, therefore, the distribution and blocking effect of interlayer must be taken into consideration on the development of heavy oil reservoir on SAGD.