Determination and model prediction of solubilities of CO2 in heavy oil under high pressure

doi:10.11949/j.issn.0438-1157.20151209

Abstract

Abstract:

In this work, the heavy oil from some oilfield in East China was investigated. The binary vapor-liquid equilibrium data of CO₂ in heavy oil was determined at 363.15, 368.15, and 373.15 K in the pressure range of 2-22 MPa by a static high pressure apparatus. The heavy oil can be regarded as one pure compound and the critical parameters of the heavy oil were calculated with group contribution method. Then the regression analysis of binary interactive parameters of supercritical carbon dioxide and heavy oil system with Peng-Robinson equation of state (P-R EOS) and the modified Patel-Teja equation of state (P-T EOS) was used to estimate the vapor-liquid equilibrium data under the same condition. It was found that the modified P-T EOS can predict the solubility data better than the P-R EOS. Thus the modified P-T EOS was more suitable for description of gas-liquid equilibrium of CO₂ in heavy oil at high temperature and pressure.

Key words: solubility, CO₂, group contribution method, heavy oil, vapor-liquid equilibrium

摘要：

选取华东地区某油田的稠油作为研究对象,采用静态高压相平衡装置,在温度363.15、368.15、373.15 K下,测定了压力2~22 MPa 范围内CO₂-稠油体系的气液两相的平衡组成。将稠油看作假一元组分,通过基团贡献法估算了稠油的临界参数,分别采用P-R 方程和改进的P-T 方程拟合关联所测得的实验数据,得到了CO₂-稠油体系的二元作用参数,最后计算了CO₂-稠油体系的相平衡数据,结果表明改进的P-T 方程的拟合结果要明显优于P-R 方程,更适用于高温高压下CO₂-稠油体系溶解度的数据预测。

关键词: 溶解度, CO₂, 基团贡献法, 稠油, 汽液平衡

CLC Number:

O642.4

WANG Wei, GAO Qiang, GUI Xia, YUN Zhi. Determination and model prediction of solubilities of CO₂ in heavy oil under high pressure[J]. CIESC Journal, 2016, 67(2): 442-447.

王伟, 高强, 桂霞, 云志. 二氧化碳在稠油中溶解度的测定与模型预测[J]. 化工学报, 2016, 67(2): 442-447.

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Determination and model prediction of solubilities of CO₂ in heavy oil under high pressure

二氧化碳在稠油中溶解度的测定与模型预测

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