Division Method and Seepage Law of Seepage Channels in a Tight Reservoir

Tight oil reservoirs are characterized by a low porosity, low permeability, and strong heterogeneity. The macropores, throats, and microcracks in reservoirs are the main seepage channels, which affect the seepage law in the reservoirs. In particular, oil-water two-phase flow in different types of po...

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Autores principales:	Zhenkai Wu, Feifei Fang, Xizhe Li, Hanmin Xiao, Xuewei Liu, Yuan Rao, Yang Li, Jie Wang, Yongcheng Luo, Zhi Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/4c09585874594ec0a98f33d7c0bafd49
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spelling	oai:doaj.org-article:4c09585874594ec0a98f33d7c0bafd492021-11-08T02:36:53ZDivision Method and Seepage Law of Seepage Channels in a Tight Reservoir1468-812310.1155/2021/4804513https://doaj.org/article/4c09585874594ec0a98f33d7c0bafd492021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/4804513https://doaj.org/toc/1468-8123Tight oil reservoirs are characterized by a low porosity, low permeability, and strong heterogeneity. The macropores, throats, and microcracks in reservoirs are the main seepage channels, which affect the seepage law in the reservoirs. In particular, oil-water two-phase flow in different types of pores requires further study. In this study, two groups of online NMR displacement experiments were designed to study the seepage characteristics of tight oil reservoirs. It was found that the main seepage channels for oil-water two-phase flow are the microcracks, large pores, and throats in the reservoir. The large pores are mainly micron and submicron scale in size. The oil in the small pores is only transferred to the large pores through imbibition to participate in the flow, and there is no two-phase flow. Based on the influence of different pore structures on the seepage law of a tight reservoir, the pores were divided into seepage zones, and a multistage seepage model for tight reservoirs was established. Based on this model, the effects of the imbibition, stress sensitivity, threshold pressure gradient, and Jamin effect on model’s yield were studied. The results show that imbibition is no longer effective after a while. Owing to the stress sensitivity, the threshold pressure gradient, and the Jamin effect, oil production will be reduced. As the parameter value increases, the oil production decreases. The production decreases rapidly in the early stage of mining while decreases slowly in the later stage, exhibiting a trend of high yield in the early stage and stable yield in the later stage.Zhenkai WuFeifei FangXizhe LiHanmin XiaoXuewei LiuYuan RaoYang LiJie WangYongcheng LuoZhi LiHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Zhenkai Wu Feifei Fang Xizhe Li Hanmin Xiao Xuewei Liu Yuan Rao Yang Li Jie Wang Yongcheng Luo Zhi Li Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
description	Tight oil reservoirs are characterized by a low porosity, low permeability, and strong heterogeneity. The macropores, throats, and microcracks in reservoirs are the main seepage channels, which affect the seepage law in the reservoirs. In particular, oil-water two-phase flow in different types of pores requires further study. In this study, two groups of online NMR displacement experiments were designed to study the seepage characteristics of tight oil reservoirs. It was found that the main seepage channels for oil-water two-phase flow are the microcracks, large pores, and throats in the reservoir. The large pores are mainly micron and submicron scale in size. The oil in the small pores is only transferred to the large pores through imbibition to participate in the flow, and there is no two-phase flow. Based on the influence of different pore structures on the seepage law of a tight reservoir, the pores were divided into seepage zones, and a multistage seepage model for tight reservoirs was established. Based on this model, the effects of the imbibition, stress sensitivity, threshold pressure gradient, and Jamin effect on model’s yield were studied. The results show that imbibition is no longer effective after a while. Owing to the stress sensitivity, the threshold pressure gradient, and the Jamin effect, oil production will be reduced. As the parameter value increases, the oil production decreases. The production decreases rapidly in the early stage of mining while decreases slowly in the later stage, exhibiting a trend of high yield in the early stage and stable yield in the later stage.
format	article
author	Zhenkai Wu Feifei Fang Xizhe Li Hanmin Xiao Xuewei Liu Yuan Rao Yang Li Jie Wang Yongcheng Luo Zhi Li
author_facet	Zhenkai Wu Feifei Fang Xizhe Li Hanmin Xiao Xuewei Liu Yuan Rao Yang Li Jie Wang Yongcheng Luo Zhi Li
author_sort	Zhenkai Wu
title	Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
title_short	Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
title_full	Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
title_fullStr	Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
title_full_unstemmed	Division Method and Seepage Law of Seepage Channels in a Tight Reservoir
title_sort	division method and seepage law of seepage channels in a tight reservoir
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/4c09585874594ec0a98f33d7c0bafd49
work_keys_str_mv	AT zhenkaiwu divisionmethodandseepagelawofseepagechannelsinatightreservoir AT feifeifang divisionmethodandseepagelawofseepagechannelsinatightreservoir AT xizheli divisionmethodandseepagelawofseepagechannelsinatightreservoir AT hanminxiao divisionmethodandseepagelawofseepagechannelsinatightreservoir AT xueweiliu divisionmethodandseepagelawofseepagechannelsinatightreservoir AT yuanrao divisionmethodandseepagelawofseepagechannelsinatightreservoir AT yangli divisionmethodandseepagelawofseepagechannelsinatightreservoir AT jiewang divisionmethodandseepagelawofseepagechannelsinatightreservoir AT yongchengluo divisionmethodandseepagelawofseepagechannelsinatightreservoir AT zhili divisionmethodandseepagelawofseepagechannelsinatightreservoir
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Division Method and Seepage Law of Seepage Channels in a Tight Reservoir

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