Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs

A reservoir-scale numerical conceptual model was established according to the actual geological characteristics of a carbonate fractured-vuggy reservoir. Considering the difference in density and viscosity of fluids under reservoir conditions, CFD (computational fluid dynamic) porous medium model wa...

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Autores principales:	Kexing Li, Bowen Chen, Wanfen Pu, Jianhai Wang, Yongliang Liu, Mikhail Varfolomeev, Chengdong Yuan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fractured-vuggy reservoir nitrogen flooding numerical simulation computational fluid dynamic enhanced oil recovery Technology T
Acceso en línea:	https://doaj.org/article/5b4e1bdd78894571a3fae5162129e296
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spelling	oai:doaj.org-article:5b4e1bdd78894571a3fae5162129e2962021-11-25T17:26:37ZNumerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs10.3390/en142275541996-1073https://doaj.org/article/5b4e1bdd78894571a3fae5162129e2962021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7554https://doaj.org/toc/1996-1073A reservoir-scale numerical conceptual model was established according to the actual geological characteristics of a carbonate fractured-vuggy reservoir. Considering the difference in density and viscosity of fluids under reservoir conditions, CFD (computational fluid dynamic) porous medium model was applied to simulate the process of nitrogen displacement in a fractured-vuggy reservoir after water flooding. The effects of gas injection rate, injection mode, and injector–producer location relation were studied. The results show that nitrogen flooding can yield additional oil recovery of 7–15% after water flooding. Low-speed nitrogen injection is beneficial in obtaining higher oil recovery. High speed injection can expand the sweep area, but gas channeling occurs more easily. In gas–water mixed injection mode, there is fluid disturbance in the reservoir. The gas channeling is faster in low injector–high producer mode, while the high injector–low producer mode is beneficial for increasing the gas sweep range. Nevertheless, the increment of recovery is closely related to well pattern. After nitrogen flooding, there are still a lot of remaining oil distributed in the trap area of gas cap and bottom water in the reservoir that water and gas injection can’t sweep. The establishment of the numerical conceptual model compensates for the deficiency of physical simulation research, stating that only limited parameters can be simulated during experiments, and provides theoretical bases for nitrogen flooding in fractured-vuggy reservoir.Kexing LiBowen ChenWanfen PuJianhai WangYongliang LiuMikhail VarfolomeevChengdong YuanMDPI AGarticlefractured-vuggy reservoirnitrogen floodingnumerical simulationcomputational fluid dynamicenhanced oil recoveryTechnologyTENEnergies, Vol 14, Iss 7554, p 7554 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fractured-vuggy reservoir nitrogen flooding numerical simulation computational fluid dynamic enhanced oil recovery Technology T
spellingShingle	fractured-vuggy reservoir nitrogen flooding numerical simulation computational fluid dynamic enhanced oil recovery Technology T Kexing Li Bowen Chen Wanfen Pu Jianhai Wang Yongliang Liu Mikhail Varfolomeev Chengdong Yuan Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
description	A reservoir-scale numerical conceptual model was established according to the actual geological characteristics of a carbonate fractured-vuggy reservoir. Considering the difference in density and viscosity of fluids under reservoir conditions, CFD (computational fluid dynamic) porous medium model was applied to simulate the process of nitrogen displacement in a fractured-vuggy reservoir after water flooding. The effects of gas injection rate, injection mode, and injector–producer location relation were studied. The results show that nitrogen flooding can yield additional oil recovery of 7–15% after water flooding. Low-speed nitrogen injection is beneficial in obtaining higher oil recovery. High speed injection can expand the sweep area, but gas channeling occurs more easily. In gas–water mixed injection mode, there is fluid disturbance in the reservoir. The gas channeling is faster in low injector–high producer mode, while the high injector–low producer mode is beneficial for increasing the gas sweep range. Nevertheless, the increment of recovery is closely related to well pattern. After nitrogen flooding, there are still a lot of remaining oil distributed in the trap area of gas cap and bottom water in the reservoir that water and gas injection can’t sweep. The establishment of the numerical conceptual model compensates for the deficiency of physical simulation research, stating that only limited parameters can be simulated during experiments, and provides theoretical bases for nitrogen flooding in fractured-vuggy reservoir.
format	article
author	Kexing Li Bowen Chen Wanfen Pu Jianhai Wang Yongliang Liu Mikhail Varfolomeev Chengdong Yuan
author_facet	Kexing Li Bowen Chen Wanfen Pu Jianhai Wang Yongliang Liu Mikhail Varfolomeev Chengdong Yuan
author_sort	Kexing Li
title	Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
title_short	Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
title_full	Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
title_fullStr	Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
title_full_unstemmed	Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs
title_sort	numerical simulation via cfd methods of nitrogen flooding in carbonate fractured-vuggy reservoirs
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5b4e1bdd78894571a3fae5162129e296
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Numerical Simulation via CFD Methods of Nitrogen Flooding in Carbonate Fractured-Vuggy Reservoirs

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