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

Abstract 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...

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Autores principales:	Zhong-Lin Yang, Hai-Yang Yu, Zhe-Wei Chen, Shi-Qing Cheng, Jian-Zheng Su
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	CO2 flooding Wong–Sandler mixing rule Equation of state Numerical simulation CO2 solubility Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/7b1dd72c16f24e1099a7faf4b8356bb7
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spelling	oai:doaj.org-article:7b1dd72c16f24e1099a7faf4b8356bb72021-12-02T05:10:11ZA compositional model for CO2 flooding including CO2 equilibria between water and oil using the Peng–Robinson equation of state with the Wong–Sandler mixing rule10.1007/s12182-018-0294-21672-51071995-8226https://doaj.org/article/7b1dd72c16f24e1099a7faf4b8356bb72019-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0294-2https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract 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 YangHai-Yang YuZhe-Wei ChenShi-Qing ChengJian-Zheng SuKeAi Communications Co., Ltd.articleCO2 floodingWong–Sandler mixing ruleEquation of stateNumerical simulationCO2 solubilityScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 4, Pp 874-889 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	CO2 flooding Wong–Sandler mixing rule Equation of state Numerical simulation CO2 solubility Science Q Petrology QE420-499
spellingShingle	CO2 flooding Wong–Sandler mixing rule Equation of state Numerical simulation CO2 solubility Science Q Petrology QE420-499 Zhong-Lin Yang Hai-Yang Yu Zhe-Wei Chen Shi-Qing Cheng Jian-Zheng Su 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
description	Abstract 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.
format	article
author	Zhong-Lin Yang Hai-Yang Yu Zhe-Wei Chen Shi-Qing Cheng Jian-Zheng Su
author_facet	Zhong-Lin Yang Hai-Yang Yu Zhe-Wei Chen Shi-Qing Cheng Jian-Zheng Su
author_sort	Zhong-Lin Yang
title	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
title_short	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
title_full	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
title_fullStr	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
title_full_unstemmed	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
title_sort	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
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/7b1dd72c16f24e1099a7faf4b8356bb7
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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

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