A compositional model for CO2 flooding including CO2 equilibria between water and oil using the Peng–Robinson equation of state with the Wong–Sandler mixing rule
投稿时间:2018-07-10  
英文关键词:CO2 flooding, Wong–Sandler mixing rule, Equation of state, Numerical simulation, CO2 solubility
基金项目:This work was financially supported by National Natural Science Foundation of China (U1762101) and National Science and Technology Major Projects (2017ZX05069). Special thanks for Changqing Oilfield for providing detailed geology and production data. We would like to express our heartfelt gratitude to Professor Haining Zhao for his constructive suggestion about this paper. Computer Modeling Group are also acknowledged for offering CMG software.
作者单位
Zhong-Lin Yang State Key Laboratory of Shale Oil and Gas Enrichment 
Hai-Yang Yu Mechanisms and Effective Development, Beijing 100083, 
Zhe-Wei Chen China
State Energy Center for Shale Oil Research and Development, Beijing 100083, China
School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China 
Shi-Qing Cheng China
State Energy Center for Shale Oil Research and Development, Beijing 100083, China
School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China 
Jian-Zheng Su State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
State Energy Center for Shale Oil Research and Development, Beijing 100083, China 
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英文摘要:
      This paper presents a three-dimensional, three-phase compositional model considering CO2 phase equilibrium between water and oil. In this model, CO2 is mutually soluble in aqueous and hydrocarbon phases, while other components, except water, exist in hydrocarbon phase. The Peng–Robinson (PR) equation of state and the Wong–Sandler mixing rule with non-random two-liquid parameters are used to calculate CO2 fugacity in the aqueous phase. One-dimensional and three-dimensional CO2 flooding examples show that a significant amount of injected CO2 is dissolved in water. Our simulation shows 7% of injected CO2 can be dissolved in the aqueous phase, which delays oil recovery by 4%. The gas rate predicted by the model is smaller than the conventional model as long as water is undersaturated by CO2, which can be considered as “lost” in the aqueous phase. The model also predicts that the delayed oil can be recovered after the gas breakthrough, indicating that delayed oil is hard to recover in field applications. A three-dimensional example reveals that a highly stratified reservoir causes uneven displacement and serious CO2 breakthrough. If mobility control measures like water alternating gas are undertaken, the solubility effects will be more pronounced than this example.
Zhong-Lin Yang,Hai-Yang Yu,Zhe-Wei Chen,Shi-Qing Cheng,Jian-Zheng Su,2019.A compositional model for CO2 flooding including CO2 equilibria between water and oil using the Peng–Robinson equation of state with the Wong–Sandler mixing rule.Petroleum Science,16(4):874~889.
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