CIESC Journal ›› 2024, Vol. 75 ›› Issue (3): 789-800.DOI: 10.11949/0438-1157.20231235

• Thermodynamics • Previous Articles     Next Articles

Phase equilibrium calculation of acid/alcohol hydrocarbon and water system based on stability analysis

Haoqi CHEN1(), Bohui SHI1,2(), Qi PENG1, Qi KANG3, Shangfei SONG1, Haiyuan YAO4, Haihong CHEN4, Haihao WU1, Jing GONG1   

  1. 1.National Engineering Research Center of Oil and Gas Pipeline Transportation Safety,MOE Key Laboratory of Petroleum Engineering,Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing 102249, China
    2.College of Carbon Neutral Energy, China University of Petroleum, Beijing 102249, China
    3.Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, Guangdong, China
    4.CNOOC Research Institute Co. , Ltd. , Beijing 100028, China
  • Received:2023-11-28 Revised:2024-02-07 Online:2024-05-11 Published:2024-03-25
  • Contact: Bohui SHI

基于稳定性分析的含酸/醇烃水体系相平衡计算

陈好奇1(), 史博会1,2(), 彭琪1, 康琦3, 宋尚飞1, 姚海元4, 陈海宏4, 吴海浩1, 宫敬1   

  1. 1.中国石油大学(北京)油气管道输送安全国家工程实验室,石油工程教育部重点实验室,城市油气输配技术北京市 重点实验室,北京 102249
    2.中国石油大学(北京)碳中和示范性能源学院,北京 102249
    3.清华大学,深圳清华大学研究院,广东 深圳 518057
    4.中海油研究总院有限责任公司,北京 100028
  • 通讯作者: 史博会
  • 作者简介:陈好奇(1997—),男,博士研究生,1649618546@qq.com
  • 基金资助:
    国家重点研发计划项目(2022YFC2806200);北京市自然科学基金面上项目(23C20113)

Abstract:

Well flow materials in oil and gas development mostly exist in the form of oil, gas and water miscibility. For sour oil and gas fields, acid gases such as hydrogen sulfide or carbon dioxide are often present. In order to avoid hydrate formation and blockage of pipelines, the injection of the alcohol inhibitor is a common method, which will make the fluid composition more complex, presenting a multiphase mixed flow of acid/alcohol hydrocarbon and water. Accurate calculation of the phase equilibrium of hydrocarbon and water system containing acid/alcohol is the basis of predicting phase behavior, and the key to support the simulation of multiphase transport flow in this complex system. The phase equilibrium calculation of this systems based on the classical cubic equation of state is widely used, but there is the problem of low accuracy in calculating the distribution of oil-water two-phase components. Therefore, a stability testing method suitable for acid/alcohol hydrocarbon and water system is proposed by introducing stability analysis method. With the SRK-HV equation of state and stability analysis, a multi-phase and multi-component flash calculation model for acid/alcohol hydrocarbon and water is established. After multiple perspectives verification, the model proposed in this research has high accuracy and stability.

Key words: phase equilibria, thermodynamics, equation of state, stability analysis, flash calculation

摘要:

油气开发的井流物多以油气水混相形式存在。对于酸性油气田,还常伴有硫化氢或二氧化碳等酸性气体。为了避免水合物生成堵塞管道,加注醇类防冻剂是常用的方法。因而油气田井流物易于呈现含酸、含醇的多相烃水混输状态。含酸/醇烃水体系相平衡的准确计算,是预测其物性特征的基础,也是支持该复杂体系多相混输流动仿真的关键。但目前被广泛应用的基于经典立方型状态方程计算油气水体系相平衡的方法,存在对液烃及水相分布预测准确性不高的问题。为此,引入稳定性分析的方法,构建适用于含酸/醇烃水体系的稳定性检验方式,结合SRK-HV状态方程,建立了耦合稳定性分析的含酸/醇烃水多相多组分相平衡计算模型及算法。经多角度验证,本研究所提模型具有较高的准确性与稳定性。

关键词: 相平衡, 热力学, 状态方程, 稳定性分析, 闪蒸计算

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