CPA方程对CO2-水体系相态研究

doi:10.12108/yxyqc.20180413

岩性油气藏 ›› 2018, Vol. 30 ›› Issue (4): 113–119.doi: 10.12108/yxyqc.20180413

CPA方程对CO₂-水体系相态研究

涂汉敏¹, 郭平¹, 贾钠², 汪周华¹, 王千³

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500;
2. 里贾纳大学工程与应用科学学院石油工程系, 里贾纳 S4S0A2, 加拿大;
3. 中海石油 (中国) 有限公司天津分公司, 天津 300452

收稿日期:2018-01-16 修回日期:2018-03-31 出版日期:2018-07-21 发布日期:2018-07-21
通讯作者: 郭平(1965-),男,硕士,教授,博士生导师,主要从事油气相态、气田开发、油气藏工程、注气提高采收率的教学和科研工作。Email:guopingswpi@vip.sina.com。 E-mail:guopingswpi@vip.sina.com
作者简介:涂汉敏(1989-),女,西南石油大学在读博士研究生,研究方向为相态、扩散和气田开发。地址:(610500)四川省成都市新都区新都大道8号西南石油大学。Email:t.hanmin@yahoo.com
基金资助:
国家自然科学基金项目“考虑毛管压力和吸附影响的CO₂-原油非平衡扩散理论及分子动力学研究”（编号：51374179）和国家留学基金委“国家建设高水平大学公派研究生项目”（编号：201708510114）联合资助

Calculation of phase behavior for CO₂-water mixtures using CPA EoS

TU Hanmin¹, GUO Ping¹, JIA Na², WANG Zhouhua¹, WANG Qian³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
2. Program of Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina S4S0A2, Canada;
3. CNOOC China Co. Ltd. Tianjing Company, Tianjing 300452, China

Received:2018-01-16 Revised:2018-03-31 Online:2018-07-21 Published:2018-07-21

摘要/Abstract

摘要： CO₂作为酸性气体之一，其热力学性质对石油、天然气开发至关重要。水通常在地层中与烃类共生，由于地层盐水的存在使得与烃类混合的气体量减少，并且这种效应将随着压力和水相量的增加而增加（随盐度的降低而减小）。因此，弄清CO₂-水体系的热力学性质将对理解这些过程具有重要的指导意义。通过运用SRK-CPA状态方程结合CR-1混合规则对CO₂-水体系的相平衡特征进行计算，研究CO₂在水中的溶解度和水在CO₂气相中的溶解度，并对308 K，373 K和473 K等3种温度下，CO₂-水体系不同缔合模型相互作用的模拟结果与实验数据进行分析，结果表明：在CO₂的临界温度和临界压力附近，由于发生了由气-液到液-液的相态转变，CO₂和水的溶解度在此温度和压力点将发生显著的变化；当CO₂作为非缔合物与缔合模型为4 C的水发生溶剂化交叉缔合时，运用CPA方程计算的溶解度结果与实验数据拟合较好。CPA方程在工程应用中能够满足含CO₂和水体系的热力学性质预测需求。

关键词: 水驱气藏, 水侵识别, 出水规律, 控制因素, 水体大小, 西湖凹陷

Abstract: Carbon dioxide(CO₂)is an acid gas, and its thermodynamic properties are vital to numerous processes in the oil and gas. Water always coexists with hydrocarbons in petroleum reservoirs, and the presence of brine may reduce the amount of gas to be mixed with hydrocarbons. This effect increases with increasing pressure and the amount of aqueous phase(while decreases with the decreasing of salinity). Hence, the understanding of the thermodynamics of CO₂-water mixtures is quite crucial for the rational design and operation of many processes. The characteristics of phase behavior for CO₂-water mixtures were studied by using Cubic-Plus-Association (CPA)Equation of State(EoS)to combine with the CR-1 mixing rule to assess the mutual solubility of CO₂ and water. CO₂ can be treated in three different ways:(1)as a non-associating molecule; (2)as an associating molecule that can be cross-associate with water(solvation);(3)as a self and cross associating molecule. As water is considered as an associating molecule,it has three association schemes of 2 B, 3 B and 4 C. The performance of CPA EoS using different interaction models was evaluated and discussed at three temperatures of 308 K, 373 K and 473 K, and also was compared to various recent published investigations. It demonstrates the complicated phase behavior of CO₂ and water, especially when they are close to the critical point of CO₂, where thermodynamic properties sudden changed. The results show that good agreement with experimental data can be achieved when CO₂ is considered as a non-associating molecule and 4 C association scheme is considered in the calculation model.

Key words: water drive gas reservoir, water invasion identification, water production laws, controlling factors, water size, Xihu Sag

中图分类号:

TE357.45

涂汉敏, 郭平, 贾钠, 汪周华, 王千. CPA方程对CO₂-水体系相态研究[J]. 岩性油气藏, 2018, 30(4): 113–119.

TU Hanmin, GUO Ping, JIA Na, WANG Zhouhua, WANG Qian. Calculation of phase behavior for CO₂-water mixtures using CPA EoS[J]. Lithologic Reservoirs, 2018, 30(4): 113–119.

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CPA方程对CO₂-水体系相态研究

Calculation of phase behavior for CO₂-water mixtures using CPA EoS

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