辽河稀油区注CO2提高采收率潜力实验评价

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。

EXPERIMENTAL EVALUATION OF CARBON DIOXIDE INJECTION FOR ENHANCED OIL RECOVERY IN LIAOHE LIGHT OIL DISTRICT

It is an important way to enhance oil recovery through gas injection after injecting water. The efficiency of EOR of carbon dioxide injection relates closely to the properties of crude oil.Whether carbon dioxide injection can be conducted will be decided according to PVT parameters, MMP of crude oil withCO₂ and crude oil properties after CO₂ injection. We pick 5 typical oil samples from different oil companies in Liaohe oil field study the phase behavior characterization and analyze the oil properties after the crude oil is miscible with CO₂. We also measured the minimum miscible pressures of two oil samples,according to which we evaluated the crude oil properties and an-alyze the possibility of CO₂ injection. The results showed that CO₂ injection in Liaohe light oil district can enhance oil recovery, but it is difficult for crude oil to be miscible with injected CO₂.