Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir

Stable gas gravity drainage is considered an effective method to enhance oil recovery, especially suitable for deep buried, large dip angle, and thick oil reservoirs. The influence of reservoir heterogeneity on controlling the gas–oil interface and sweep characteristics of injected gas is particular...

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Autores principales:	Hongwei Yu, Lu Wang, Daiyu Zhou, Fuyong Wang, Shi Li, Jun Li, Xinglong Chen, An Cao, Haishui Han
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	gravity drainage sweep characteristics gas flooding interlayer fracture General Works A
Acceso en línea:	https://doaj.org/article/e7ae63a60969407da3b73e7d9c6f57b1
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id	oai:doaj.org-article:e7ae63a60969407da3b73e7d9c6f57b1
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spelling	oai:doaj.org-article:e7ae63a60969407da3b73e7d9c6f57b12021-11-12T06:48:23ZExperimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir2296-598X10.3389/fenrg.2021.760315https://doaj.org/article/e7ae63a60969407da3b73e7d9c6f57b12021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.760315/fullhttps://doaj.org/toc/2296-598XStable gas gravity drainage is considered an effective method to enhance oil recovery, especially suitable for deep buried, large dip angle, and thick oil reservoirs. The influence of reservoir heterogeneity on controlling the gas–oil interface and sweep characteristics of injected gas is particularly important to design reservoir development schemes. In this study, according to the interlayer characteristics of Donghe carboniferous oil reservoirs in the Tarim Basin, NW China, 2D visual physical models are established, in which the matrix permeability is 68.1 mD and average pore throat radius is 60 nm. Then, hydrocarbon gas gravity drainage simulation experiments are carried out systematically, and a high-speed camera is used to record the process of gas–oil flow and interface movement. In this experiment, the miscible zone of crude oil and hydrocarbon gas is observed for the first time. The interlayer has an obvious shielding influence, which can destroy the stability of the gas–oil interface and miscible zone, change the movement direction of the gas–oil interface, and reduce the final oil recovery after gravity drainage. The remaining oil mainly is distributed near the interlayers. The higher displacement pressure leads to increased stability of the gas–oil displacement front and later gas breakthrough, which leads to higher oil recovery. The lower gas injection rate contributes to a slower front velocity and wider miscible zone, which could delay gas breakthrough. For the immiscible gas gravity drainage, there is a critical gas injection rate, with which the oil recovery factor is the highest.Hongwei YuLu WangDaiyu ZhouFuyong WangShi LiJun LiXinglong ChenAn CaoHaishui HanFrontiers Media S.A.articlegravity drainagesweep characteristicsgas floodinginterlayerfractureGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gravity drainage sweep characteristics gas flooding interlayer fracture General Works A
spellingShingle	gravity drainage sweep characteristics gas flooding interlayer fracture General Works A Hongwei Yu Lu Wang Daiyu Zhou Fuyong Wang Shi Li Jun Li Xinglong Chen An Cao Haishui Han Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
description	Stable gas gravity drainage is considered an effective method to enhance oil recovery, especially suitable for deep buried, large dip angle, and thick oil reservoirs. The influence of reservoir heterogeneity on controlling the gas–oil interface and sweep characteristics of injected gas is particularly important to design reservoir development schemes. In this study, according to the interlayer characteristics of Donghe carboniferous oil reservoirs in the Tarim Basin, NW China, 2D visual physical models are established, in which the matrix permeability is 68.1 mD and average pore throat radius is 60 nm. Then, hydrocarbon gas gravity drainage simulation experiments are carried out systematically, and a high-speed camera is used to record the process of gas–oil flow and interface movement. In this experiment, the miscible zone of crude oil and hydrocarbon gas is observed for the first time. The interlayer has an obvious shielding influence, which can destroy the stability of the gas–oil interface and miscible zone, change the movement direction of the gas–oil interface, and reduce the final oil recovery after gravity drainage. The remaining oil mainly is distributed near the interlayers. The higher displacement pressure leads to increased stability of the gas–oil displacement front and later gas breakthrough, which leads to higher oil recovery. The lower gas injection rate contributes to a slower front velocity and wider miscible zone, which could delay gas breakthrough. For the immiscible gas gravity drainage, there is a critical gas injection rate, with which the oil recovery factor is the highest.
format	article
author	Hongwei Yu Lu Wang Daiyu Zhou Fuyong Wang Shi Li Jun Li Xinglong Chen An Cao Haishui Han
author_facet	Hongwei Yu Lu Wang Daiyu Zhou Fuyong Wang Shi Li Jun Li Xinglong Chen An Cao Haishui Han
author_sort	Hongwei Yu
title	Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
title_short	Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
title_full	Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
title_fullStr	Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
title_full_unstemmed	Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir
title_sort	experimental study on sweep characteristics of gas gravity drainage in the interlayer oil reservoir
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/e7ae63a60969407da3b73e7d9c6f57b1
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Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir

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