Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop

The seepage performance of a rock mass mainly depends on the rock fractures developed in it. Numerical calculation method is a common method to study the permeability properties of fractures. Seepage in rock fractures is affected by various factors such as fracture aperture, roughness, and filling,...

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Autores principales:	Gang Chen, Ling Ma, Hongsheng Gong, Fengqiang Luo
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/7ffbd657368f43549ee3c3dad7cb4de4
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spelling	oai:doaj.org-article:7ffbd657368f43549ee3c3dad7cb4de42021-11-08T02:36:29ZNumerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop1468-812310.1155/2021/1828175https://doaj.org/article/7ffbd657368f43549ee3c3dad7cb4de42021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/1828175https://doaj.org/toc/1468-8123The seepage performance of a rock mass mainly depends on the rock fractures developed in it. Numerical calculation method is a common method to study the permeability properties of fractures. Seepage in rock fractures is affected by various factors such as fracture aperture, roughness, and filling, among which aperture and roughness are the two most widely influenced factors. The Navier-Stokes (NS) equation can be solved directly for the seepage flow in rock fractures with good accuracy, but there are problems of large computational volume and slow solution speed. In this paper, the fracture aperture space data is substituted into the local cubic law as an aperture function to form a numerical calculation method for seepage in rough rock fractures, namely, the aperture function method (AFM). Comparing with the physical seepage experiments of rock fractures, the calculation results of AFM will produce a small amount of error under the low Reynolds number condition, but it can greatly improve the calculation efficiency. The high efficiency of calculation makes it possible to apply AFM to the calculation of large-scale 3D rough fracture network models. The pressure drop of fluid in the fracture has viscous pressure drop (VPD) and local pressure drop (LPD). VPD can be calculated using the AFM. After analyzing the results of solving the NS equation for fracture seepage, it is concluded that the LPD includes the pressure drop caused by area crowding in the recirculation zone (RZ), kinetic energy loss in the RZ, kinetic energy loss in the vortices, and other reasons.Gang ChenLing MaHongsheng GongFengqiang LuoHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Gang Chen Ling Ma Hongsheng Gong Fengqiang Luo Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
description	The seepage performance of a rock mass mainly depends on the rock fractures developed in it. Numerical calculation method is a common method to study the permeability properties of fractures. Seepage in rock fractures is affected by various factors such as fracture aperture, roughness, and filling, among which aperture and roughness are the two most widely influenced factors. The Navier-Stokes (NS) equation can be solved directly for the seepage flow in rock fractures with good accuracy, but there are problems of large computational volume and slow solution speed. In this paper, the fracture aperture space data is substituted into the local cubic law as an aperture function to form a numerical calculation method for seepage in rough rock fractures, namely, the aperture function method (AFM). Comparing with the physical seepage experiments of rock fractures, the calculation results of AFM will produce a small amount of error under the low Reynolds number condition, but it can greatly improve the calculation efficiency. The high efficiency of calculation makes it possible to apply AFM to the calculation of large-scale 3D rough fracture network models. The pressure drop of fluid in the fracture has viscous pressure drop (VPD) and local pressure drop (LPD). VPD can be calculated using the AFM. After analyzing the results of solving the NS equation for fracture seepage, it is concluded that the LPD includes the pressure drop caused by area crowding in the recirculation zone (RZ), kinetic energy loss in the RZ, kinetic energy loss in the vortices, and other reasons.
format	article
author	Gang Chen Ling Ma Hongsheng Gong Fengqiang Luo
author_facet	Gang Chen Ling Ma Hongsheng Gong Fengqiang Luo
author_sort	Gang Chen
title	Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
title_short	Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
title_full	Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
title_fullStr	Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
title_full_unstemmed	Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop
title_sort	numerical calculation of fracture seepage in rough rock and analysis of local pressure drop
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/7ffbd657368f43549ee3c3dad7cb4de4
work_keys_str_mv	AT gangchen numericalcalculationoffractureseepageinroughrockandanalysisoflocalpressuredrop AT lingma numericalcalculationoffractureseepageinroughrockandanalysisoflocalpressuredrop AT hongshenggong numericalcalculationoffractureseepageinroughrockandanalysisoflocalpressuredrop AT fengqiangluo numericalcalculationoffractureseepageinroughrockandanalysisoflocalpressuredrop
_version_	1718443109539381248

Numerical Calculation of Fracture Seepage in Rough Rock and Analysis of Local Pressure Drop

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