注空气过程中原油相行为及其影响分析

以中原油田明15块地层原油为例,基于室内空气原油PVT实验,建立了空气原油PVT模型,分析了空气注入对原油相行为的影响。并根据室内空气原油氧化实验结果,分析了空气与原油发生氧化反应后气体产物在原油中的溶解对原油相行为的影响。结果表明,在明15原始地层温度和压力下,地层原油能溶解其自身体积9.4%(v/v)的空气量,并且这些溶解了的空气对地层恢复能量的贡献为溶解气总体积的38.6%。氧化反应产物气体较之纯空气在原油中有更好的溶解度,但增溶幅度较小(增加1.4%)。氧化反应气体产物在原油中的溶解可使原油膨胀3.6%,膨胀能力有限。

Crude oil phase behavior and its influence analysis by air injection

Take Zhongyuan oil field M15 block crude oil as example,based on PVT experiments,established the PVT model of air and crude oil system,analyzed the influence of phase behavior by air injection.In addition,based on the oxidation experiments,analyzed the influence of phase behavior by gas dissolution which producted by air and oil oxidation reaction.The results showed that under the original for-mation temperature and pressure of M15 block,crude oil can dissolve 9.4% air amount of its own volume,and the dissolved air can make a contribution to recovery reservoir energy of 38.6% volume of dissolved gas.The product gas of oxidation reaction have better solubility in crude oil than pure air.But the solubilization have a lesser extent(increase 1.4%).The dissolution of gas which producted by oxidation reaction have limited expansion capacity,it can make crude oil expansion by 3.6%.