$Exploitation of fractured shale oil resources by cyclic CO2 injection$
Código QR

Exploitation of fractured shale oil resources by cyclic CO2 injection

Abstract With shale oil reservoir pressure depletion and recovery of hydrocarbons from formations, the fracture apertures and conductivity are subject to reduction due to the interaction between stress effects and proppants. Suppose most of the proppants were concentrated in dominant fractures rathe...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Tao Wan, Hong-Xian Liu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	CO2-enhanced oil recovery Huff-n-puff Shale oil reservoirs Recovery simulation Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/9c1e077a59384a86b659fbd79f87c90f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:9c1e077a59384a86b659fbd79f87c90f
record_format	dspace
spelling	oai:doaj.org-article:9c1e077a59384a86b659fbd79f87c90f2021-12-02T02:23:10ZExploitation of fractured shale oil resources by cyclic CO2 injection10.1007/s12182-018-0226-11672-51071995-8226https://doaj.org/article/9c1e077a59384a86b659fbd79f87c90f2018-03-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0226-1https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract With shale oil reservoir pressure depletion and recovery of hydrocarbons from formations, the fracture apertures and conductivity are subject to reduction due to the interaction between stress effects and proppants. Suppose most of the proppants were concentrated in dominant fractures rather than sparsely allocated in the fracture network, the fracture conductivity would be less influenced by the induced stress effect. However, the merit of uniformly distributed proppants in the fracture network is that it increases the contact area for the injection gas with the shale matrix. In this paper, we address the question whether we should exploit or confine the fracture complexity for CO2-EOR in shale oil reservoirs. Two proppant transport scenarios were simulated in this paper: Case 1—the proppant is uniformly distributed in the complex fracture system, propagating a partially propped or un-propped fracture network; Case 2—the proppant primarily settles in simple planar fractures. A series of sensitivity studies of the fracture conductivity were performed to investigate the conductivity requirements in order to more efficiently produce from the shale reservoirs. Our simulation results in this paper show the potential of CO2 huff-n-puff to improve oil recovery in shale oil reservoirs. Simulation results indicate that the ultra-low permeability shales require an interconnected fracture network to maximize shale oil recovery in a reasonable time period. The well productivity of a fracture network with a conductivity of 4 mD ft achieves a better performance than that of planar fractures with an infinite conductivity. However, when the conductivity of fracture networks is inadequate, the planar fracture treatment design maybe a favorable choice. The available literature provides limited information on the relationship between fracture treatment design and the applicability of CO2 huff-n-puff in very low permeability shale formations. Very limited field test or laboratory data are available on the investigation of conductivity requirements for cyclic CO2 injection in shale oil reservoirs. In the context of CO2 huff-n-puff EOR, the effect of fracture complexity on well productivity was examined by simulation approaches.Tao WanHong-Xian LiuKeAi Communications Co., Ltd.articleCO2-enhanced oil recoveryHuff-n-puffShale oil reservoirsRecovery simulationScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 3, Pp 552-563 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	CO2-enhanced oil recovery Huff-n-puff Shale oil reservoirs Recovery simulation Science Q Petrology QE420-499
spellingShingle	CO2-enhanced oil recovery Huff-n-puff Shale oil reservoirs Recovery simulation Science Q Petrology QE420-499 Tao Wan Hong-Xian Liu Exploitation of fractured shale oil resources by cyclic CO2 injection
description	Abstract With shale oil reservoir pressure depletion and recovery of hydrocarbons from formations, the fracture apertures and conductivity are subject to reduction due to the interaction between stress effects and proppants. Suppose most of the proppants were concentrated in dominant fractures rather than sparsely allocated in the fracture network, the fracture conductivity would be less influenced by the induced stress effect. However, the merit of uniformly distributed proppants in the fracture network is that it increases the contact area for the injection gas with the shale matrix. In this paper, we address the question whether we should exploit or confine the fracture complexity for CO2-EOR in shale oil reservoirs. Two proppant transport scenarios were simulated in this paper: Case 1—the proppant is uniformly distributed in the complex fracture system, propagating a partially propped or un-propped fracture network; Case 2—the proppant primarily settles in simple planar fractures. A series of sensitivity studies of the fracture conductivity were performed to investigate the conductivity requirements in order to more efficiently produce from the shale reservoirs. Our simulation results in this paper show the potential of CO2 huff-n-puff to improve oil recovery in shale oil reservoirs. Simulation results indicate that the ultra-low permeability shales require an interconnected fracture network to maximize shale oil recovery in a reasonable time period. The well productivity of a fracture network with a conductivity of 4 mD ft achieves a better performance than that of planar fractures with an infinite conductivity. However, when the conductivity of fracture networks is inadequate, the planar fracture treatment design maybe a favorable choice. The available literature provides limited information on the relationship between fracture treatment design and the applicability of CO2 huff-n-puff in very low permeability shale formations. Very limited field test or laboratory data are available on the investigation of conductivity requirements for cyclic CO2 injection in shale oil reservoirs. In the context of CO2 huff-n-puff EOR, the effect of fracture complexity on well productivity was examined by simulation approaches.
format	article
author	Tao Wan Hong-Xian Liu
author_facet	Tao Wan Hong-Xian Liu
author_sort	Tao Wan
title	Exploitation of fractured shale oil resources by cyclic CO2 injection
title_short	Exploitation of fractured shale oil resources by cyclic CO2 injection
title_full	Exploitation of fractured shale oil resources by cyclic CO2 injection
title_fullStr	Exploitation of fractured shale oil resources by cyclic CO2 injection
title_full_unstemmed	Exploitation of fractured shale oil resources by cyclic CO2 injection
title_sort	exploitation of fractured shale oil resources by cyclic co2 injection
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/9c1e077a59384a86b659fbd79f87c90f
work_keys_str_mv	AT taowan exploitationoffracturedshaleoilresourcesbycyclicco2injection AT hongxianliu exploitationoffracturedshaleoilresourcesbycyclicco2injection
_version_	1718402485822947328

Exploitation of fractured shale oil resources by cyclic CO2 injection

Ejemplares similares