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在油田开发过程中 ,注水开采以后 ,注气是提高采收率的一种重要方法。CO2 混相和非混相驱提高采收率的效果与地层原油的性质密切相关。通过PVT分析和混相压力的测定 ,研究地层原油性质和注气后地层流体性质变化情况可为注气决策提供基本依据。分别选取了不同采油厂有代表性的 5个区块 ,进行地层原油相态特征和注CO2 后流体相态特征研究和对比分析 ,测定其中的两个区块地层原油的最小混相压力 ,评价辽河油田稀油区的地层流体性质和预测注CO2 提高采收率潜力。结果表明 :辽河稀油区注CO2 吞吐提高采收率有一定的潜力 ,但难以到达CO2 混相驱效果
Gas injection is an important way to increase oil recovery during oilfield development after water injection. The effect of CO2 mixed and immiscible flooding on oil recovery is closely related to the nature of formation oil. Through the analysis of PVT and the determination of mixed-phase pressure, studying the properties of formation crude oil and the change of formation fluid properties after gas injection can provide the basic evidence for gas injection decision-making. Five representative reservoirs of different oil production plants were selected to study and compare the phase behavior of crude oil and the phase behavior after CO2 injection. The minimum miscibility pressure of crude oil in two block formations was measured and evaluated. Stratigraphic Fluid Properties in Predominant Oilfields and Prediction of the Potential for CO2 Enhanced Oil Recovery. The results show that there is a certain potential for the CO2 injection in the thin oil area of Liaohe to increase oil recovery, but it is difficult to reach the effect of CO2 mixed flooding