Factors Of The Foam Composite Flooding Mechanism And Impact Of The Flooding Effect

Foam combined flooding is a new EOR technique which was developed on the basis of alkaline-surfactant-polymer combined flooding method. It has concertrated merits of both ASP flooding and general foam flooding, thus it can improve oil recovery greatly and has higher value of study on theory and more important value of direction. According to macroscopic physical simulation, the subject districts the effect that profile control effect, weeping oil effect and gas up-flowing effect have on ultimate oil displacement efficiency at the aspect of oil recovery efficiency to provide warranty for formulation screen of foam combined flooding and optimization of inputting methods.This paper has discussed deeply several aspects as follows: Firstly, it studies foam microscopic oil displacement process of different wettability medium and mechanism and blocking ability of foam combined flooding system to formation and the factor of effect to foam stability.Secondly, apparent viscosity of foam combined flooding in the capillaries and seepage flowing characteristic in inhomogeneous medium .Oil reservoir have been investigated by u>?_ of simulation and corresponding influencing factors.Thirdly According to macroscopic physical simulation, the subject district the effect that profile control effect, sweeping oil effect and gas up-flowing effect have on ultimate oil displacement efficiency at the aspect of oil recovery efficiency.Finally, it analyses synthetically influencing factors of foam combined flooding , synthesizing in-situ simulation.The above investigations have revealed the production and damnation of foam , migrating rule of foam in porous media and the microscopic oil displacement mechanism of foam combined flooding and obtained foaming characteristic and the effect of various influencing factors on foaming characteristic .Such as inner cause inhomogeneous medium of formation. ASP ingredients wettability and oil existence etc. The investigations of foaming microscopic oil displacement show that foam has an measureless effect on start-up remained oil and improving sweeping efficiency during displacement. Particularly, profile control sweeping oil and gas up-flowing effect devotes to oil displacement efficiency during foaming oil displacement and if designs the simulation model of microscopic according to experiments.Based on amounts of physical simulation experiments started from microscopic oil displacement mechanism of foam combined flooding, it studies systematically the role of foam combined flooding improving oil recovery efficiency and by use of macroscopic percolation flow through porous media experiments discusses percolation flow characteristic of foam combined system through porous media . At the aspect of recovery efficiency if studies that gas up-f lowing profile control effect and sweeping oil effect of foam combined system devoted to the recovery efficiency of foam combined flooding . It studies systematically the role of foam combined flooding improving oil recovery efficiency and by use of macroscopic percolation flow through porous media experiments discusses percolation flow characteristic of foam combined system through porous media . At the aspect of recovery efficiency. It studies that gas up-flowing, profile control effect and sweeping oil effect of foam combined system devoted to the recovery efficiency of foam combined flooding .It studies major factors influencing foam combined flooding at the aspect of microscopic and macroscopic and combining field experiments analyses the factors of influencing the field experiment of foam combined flooding N-2-E, thus provides direction for changing oil field practicing foam combined flooding on mechanism.