| Miscible displacement is a very important technology of EOR. In abroad, Miscible displacement technology has been advanced for being attached importance to it and applied it. Due to the research of internal miscible displacement technology be too late, there have been only few pilot tests in DaQing, ShengLi, ZhongYuan oil field etc, and the practical oil-field application is only hydrocarbon miscible flooding and WAG in PuBei oil field of TuHa.In order to improve the development effect of hydrocarbon miscible flooding in PuBei oil field, in the paper, has studied the theory of enhancement oil recovery of hydrocarbon miscible flooding and affected factors, summarized the method to calculation MMP. Based on research results of numerical reservoir simulation theory and application, has been made a study, which trace simulated for the effect of hydrocarbon miscible flooding development in PuBei oil field. This provides the foundation for development next step.By the studies in the paper, could make some conclusions:Has studied the theory of enhancement oil recovery of hydrocarbon miscible flooding, the phase characters changes in the injection gas process, the theory of FCM, multi-contact miscible flooding, pseudo- miscible flooding, the effect factors of miscible flooding, and methods of the improvement effect of miscible flooding.Has studied the measure method of MMP in the lab, the experiential calculation method of it, the chart calculation method, multi-contact calculation method, the EOR calculation method, serial line analysis method, numerical simulation method, and has obtained the MMP of PuBei oil field by these methods.By long core displacement experiment and numerical simulation, has made comparative analysis of development effect for injection water, WAG, GAW, and injection gas in PuBei oil field. The effect of water flooding is the worst, but injection gas miscible flooding is the best, and GAW more than WAG, depends on effect of displacing oil,By studied section model, (1)in WAG and miscible flood process the water-gas ratio is 1:2, which have better displacement characteristics than the water-gas ratio is 1:1 and 2:1; (2) infuse lug more smaller, displacement more efficiency; (3)immiscible displacement has more smaller displacement efficiency than miscible displacement and the breakthrough time is brought forward too (4)the gravitational differentiation is obvious presented in WAG and miscible process.The numerical simulation results of whole PuBei oil field indicate: (1)with the exploitation, the oil-gas ratio in the oil wells which located in west high spot always quick climbed; but the oil-gas ratio in the oil wells which located in east low spot raised slowy or kept primary level; (2)stopping gas injection, and let all of gas input well tum to waterinjection well, the exploit effect will distinctness variation; (3)added two new development well have little effect to whole exploitation.(6) It shows energy has been kept a balance between east zone and west zone in PuPei to the production analysis. The main reason that the mainly wells have produced water and the water cut has raised up quickly is production beyond common scale. Therefore, it would be the most important schedule in the PuBei oil field development to produce oil steadily and decline water cut.
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