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Viscous fingering and its effect on areal sweep efficiency during waterflooding: an experimental study

Petroleum Science 2019年第1期16卷 105-116页

作者： Zahra Kargozarfard Masoud Riazi Shahab Ayatollahi Enhanced Oil Recovery (EOR) Research Centre IOR-EOR Research Institute Shiraz University Department of Petroleum Engineering School of Chemical and Petroleum Engineering Shiraz University Enhanced Oil Recovery (EOR) Research Center School of Chemical and Petroleum Engineering Sharif University of Technology

Viscous fingering is one of the main challenges that could reduce areal sweep efficiency during waterflooding in oil reservoirs. A series of waterflooding experiments were carried out in a Hele-Shaw cell at ambient temperature during which areal sweep efficiency was estimated and techniques to ease the fingering problem were examined. The onset and propagation of viscous fingers were monitored as a function of both injection rate and injection/production positions. Image processing techniques were utilized to quantitatively investigate the propagation of fingers. The experimental results show that, under specific conditions, increasing the number of finger branches could improve the areal sweep efficiency, whereas growth of a single narrow finger has a negative impact on oil displacement efficiency. According to the obtained results,increasing the injection rate improves the areal sweep efficiency up to a critical rate at which viscous fingers start to *** impact of heterogeneity of the medium on distributing the viscous fingers was also investigated by introducing two different arrangements of fractures in the model. The results show that fractures perpendicular to the direction of flow would distribute the displacing water more uniformly, while fractures in the direction of flow would amplify the unfavorable sweep efficiency.

关键词： Viscous fingering Areal sweep efficiency Front instability Mobility ratio Fractures Hele-Shaw cell

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Empirical mode decomposition of multiphase flows in porous media:characteristic scales and speed of convergence

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Petroleum Science 2020年第1期17卷 153-167页

作者： Nicolás Echebarrena Pablo D.Mininni Gustavo A.Moreno YPF-Technology EnsenadaBuenos AiresArgentina CONICET Buenos AiresArgentina Physics Department IFIBASchool of Exact and Natural SciencesUniversity of Buenos AiresCONICETUniversity Campus1428 Buenos AiresArgentina

We apply a proper orthogonal decomposition(POD)to data stemming from numerical simulations of a fingering instability in a multiphase flow passing through obstacles in a porous medium,to study water injection processes in the production of hydrocarbon *** show that the time evolution of a properly defined flow correlation length can be used to identify the onset of the fingering *** of characteristic lengths for each of the modes resulting from the POD provides further information on the dynamics of the ***,using numerical simulations with different viscosity ratios,we show that the convergence of the POD depends non-trivially on whether the fingering instability develops or *** result has implications on proposed methods to decrease the dimensionality of the problem by deriving reduced dynamical systems after truncating the system’s governing equations to a few POD modes.

关键词： Two-phase flow Empirical mode decomposition Viscous fingering Porous media

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Shared Memory Semi-Implicit Solver for Hydrodynamical Instability Processes

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Open Journal of Fluid Dynamics 2023年第1期13卷 32-46页

作者： Augusto Kielbowicz Diego Fernández Adriana Saal Claudio El Hasi Carlos Vigh Instituto de Ciencias Universidad Nacional de General Sarmiento Los Polvorines Argentina Departamento de Ciencias Básicas Facultad de Ingeniería Universidad Argentina de la Empresa Buenos Aires Argentina Departamento de Física Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires Argentina Instituto de Física Interdisciplinaria Aplicada (CONICET-UBA) Buenos Aires Argentina

The Advection-Diffusion Reaction (ADR) equation appears in many problems in nature. This constitutes a general model that is useful in various scenarios, from porous media to atmospheric processes. Particularly, it is used at the interface between two fluids where different types of instabilities due to surface mobility may appear. Together with the ADR equation, the Darcy-Brinkman model describes the phenomena known as fingering that appear in different contexts. The study of this type of system gains in complexity when the number of chemical species dissolved in both fluids increases. With more solutes, the increasing complexity of this phenomenon generally requires much computational power. To face the need for more computational resources, we build a solver tool based on an Alternating Direction Implicit (ADI) scheme that can be run in Central Processing Unit (CPU) and Graphic Processing Unit (GPU) architectures on any notebook. The implementation is done using the MATLAB platform to compare both versions. It is shown that using the GPU version strongly saves both resources and calculation times.

关键词： fingering Fluids Simulations Numerical Solver Hele-Shaw Cell

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Physical Properties of Persian Gulf Outflow Thermohaline Intrusion in the Oman Sea

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Open Journal of Marine Science 2017年第1期7卷 169-190页

作者： Eram Ghazi Abbasali Aliakbari Bidokhti Mojtaba Ezam Masoud Torabi Azad Smaeyl Hassanzadeh Department of Marine Science and Technology Science and Research Branch Islamic Azad University Tehran Iran Institute of Geophysics University of Tehran Tehran Iran Department of Marine Science and Technology Islamic Azad University Tehran North Branch Tehran Iran Institute of Physics University of Isfahan Isfahan Iran

Various CTD data obtained in the Oman Sea are analyzed to explain structural features of intrusive layering. Special attention is compensated to thermohaline intrusions observed in layers (depth ranges of 150 m to 450 m, 150 m to 350 m, 100 m to 350 m and 150 m and 400 m in the winter, spring, summer and autumn, respectively). The temperature and salinity profiles in thermohaline intrusion have sawtooth structure in all stations, while they have step structure in density field. Based on interpretations, detailed estimates of thickness are about 10 to 20 meters. The T-S diagrams show the positions of the outflow intrusion with different thicknesses and depths for all seasons in the Oman Sea. Vertical profiles of temperature and salinity show two boundaries in the upper and lower layers. They are prone to double diffusive convection. Salt fingering and diffusive convection can be seen in both the upper and lower boundaries, and salt fingering is stronger at the lower boundary. Diffusive convection also is visible from the surface to the mid-depth of the plume outflow, and the diffusive intrusion is more severe at the upper boundary than the surface and deep. The intensity of double diffusion in the bottom border is greater than the upper boundary. At the deeper parts, the stratification is completely stable. Variations of the positions of greatest salinities in different diagrams are due to changing water masses for different locations and depths and paths of intrusive flow.

关键词： Thermohaline Intrusion Double Diffusive Convection Salt fingering Persian Gulf Outflow

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On the Khachaturian's “Violin Concerto”

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新课程(中) 2010年第1期 85-85页

作者：王威青岛大学音乐学院

Khachaturian’s "Violin Concerto" has a distinct style of Armenian folk music features,its content,themes and forms of distinctive features,performative methods are also *** article aims to analyze the content and for... 详细信息

关键词： Khachaturian Concerto bowing fingering

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