Experiment and characterization on phase behavior of CO<sub>2</sub> and crude oil in porous media

JIANG Yanbo

doi:10.13809/j.cnki.cn32-1825/te.2020.03.003

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Experiment and characterization on phase behavior of CO₂ and crude oil in porous media
Vol. 10, Issue 3, Pages: 23-27(2020)
Published：2020
DOI： 10.13809/j.cnki.cn32-1825/te.2020.03.003
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DOI：

JIANG Yanbo. Experiment and characterization on phase behavior of CO₂ and crude oil in porous media[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(3): 23-27. DOI： 10.13809/j.cnki.cn32-1825/te.2020.03.003.

摘要

低渗致密油藏中

多孔介质对原油流体相态影响不可忽略。针对致密油藏CO

驱过程中多孔介质对原油流体相态的影响问题

建立了基于全直径岩心夹持器的多孔介质中流体相态实验方法

开展了不同溶解气量、不同渗透率条件下PVT筒及多孔介质中流体相态实验。研究结果表明

多孔介质中原油泡点压力要低于PVT筒中实测值

且随着CO

溶解气量或渗透率的减小

泡点压力降低幅度增大。基于室内实验结果

将原油中烃类组分分子直径与储层岩心平均孔道直径比例引入到

（

）函数中

对SRK状态方程进行修正

建立了一种多孔介质中流体相态参数预测方法

模拟结果与实验值吻合较好

修正并建立了多孔介质中流体状态方程及相态表征方法。

Abstract

In tight reservoirs with low permeability

the effect of porous media on fluid phase behavior can not be ignored. Therefore

the experiments of fluid phase behavior in PVT cylinder and porous media at different conditions of the dissolution gas and the permeability values are established based on full diameter core holder. The results show that the bubble point pressure of crude oil in porous media is lower than that in PVT cylinder. The difference between these two conditions become more evident as the dissolution gas volume becomes lower or the permeability becomes smaller. Based on the above results

the specific value of the diameter of hydrocarbon components and the average diameter of rock pore space is introduced into

the function

（

）

modifying the classic SRK EOS equation and proposing the prediction model to calculate the parameters of crude oil in porous media. The simulation results are in good agreement with the experimental data. Furthermore

the EOS and characterized method are modified and established.