Mechanism Of Removing Residue Oil By GEMCPF In Higher Water Cut

Considering the technology of tapping remaining oil at later stage of high water cut in Daqing oil field, a new idea of tapping remaining oil with gathered-energy moving controlled- profile flood(GEMCPF) has been proposed. This technology regards the diversion of flood fluid as the main model of displacing remaining oil, which can make the injecting energy effectively and then has the characteristics of less energy required, lager swept volume, and higher displacing efficiency to develop the capacity of tapping remaining oil at the later stage of high water cut.Firstly, the theory of turning and diverting role of fluid has been established by visual experiment. That is, flowing field features of flooding with polymer or with GEMCPF have been researched mainly on the model of two-layer heterogeneous glass core, and the fundamental principle of flooding fluid diverting has been presented on the basis of sides of plugging and diversion. Secondly, according to laboratory experiments of cuboids heterogeneous core, the macro-feature and characteristics of inner pressure field of GEMCPF have been studied, and it is confirmed that gathered eneger moving pressure field and phenomenon of diverting are existing in the process of displacement. Thirdly, numerical simulation is used to show the results of visual and laboratory experiments again. And then, the association of diverting and gathered eneger moving pressure field is researched from the angle of flow field and pressure field. Fourthly, stimulating mechanisms of GEMCPF is researched. Moreover, the analyzing of the sensibility factors of GEMCPF for polymer by the means of orthogonal experiment combining with numerical simulation is presented. Fifthly, based on field application, the method of selecting wells, layers, and the principle of designing slug are given, especially a new analytical means about heterogeneity condition of subsurface flowing field with dynamic and steady data and the valuation method of the treatment. It enlivens the application of this technology.Through the above research, a complete set of theory and technology to tap remaining oil of thick oil layer by diverted fluid at later stage of high water-cut has been established, and many innovative and developing achievements have been made such as displacement philosophy, knowledge of flow field, recognition method of heterogeneity, field design, and so on. It offers advanced theories and practical methods for displacing remaining oil for Daqing oil field, and has significant impacts on keeping the production level of 40000000tons in Daqing oil field.