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single-phase-flow
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Modeling of Multicomponent Fluid Flow Through Fractured Porous Media Using XFEM
, M.Sc. Thesis Sharif University of Technology ; Khoei, Amir Reza (Supervisor)
Abstract
In the present research, a numerical model is developed based on extended finite element method to simulate single phase multicomponent fluid flow through naturally fractured porous media containing explicit fractures. Each of fracture and porous matrix are separate continuous media that interact with each other due to fluid and solute exchange. The governing equations involve continuity equation of fluid phase and mass conservation equation of one component. The extended finite element method allows for explicit and accurate representation of cracks to capture the mass transfer of fluid components between fracture and matrix. Existence of fracture in the domain results in discontinuity of...
Simulation and Optimization of Downhole Pumps with Focus on IOR Application in Iranian Fields
, M.Sc. Thesis Sharif University of Technology ; Shad, Saeed (Supervisor)
Abstract
Three-dimensional (3D) computational fluid dynamics (CFD) was used in this study to investigate single and multi phase flow behavior related to three stages of ESP pump. Compared to experimental measurements, the numerical prediction for single phase flow of water is matched very well. Furthermore, the effects of viscosity and pump rotational speed for oil were investigated and the results show that by increasing oil viscosity and decreasing rotational speed, the pump head and efficiency reduced. ESP performance under two phase oil-methane flow and the effect of oil viscosity, rotational speed, intake pressure, gas bubble diameter, oil rate and gas volume fraction were studied. ESP boosting...
Generation of Voronoi grid based on vorticity for coarse-scale modeling of flow in heterogeneous formations
, Article Transport in Porous Media ; Volume 83, Issue 3 , Oct , 2010 , Pages 541-572 ; 01693913 (ISSN) ; Mahani, H ; Sharif University of Technology
2010
Abstract
We present a novel unstructured coarse grid generation technique based on vorticity for upscaling two-phase flow in permeable media. In the technique, the fineness of the gridblocks throughout the domain is determined by vorticity distribution such that where the larger is the vorticity at a region, the finer are the gridblocks at that region. Vorticity is obtained from single-phase flow on original fine grid, and is utilized to generate a background grid which stores spacing parameter, and is used to steer generation of triangular and finally Voronoi grids. This technique is applied to two channelized and heterogeneous models and two-phase flow simulations are performed on the generated...
Investigating the Propagation of Thermal-hydraulic Noise in PWRs in Two phases
, M.Sc. Thesis Sharif University of Technology ; Vosoughi, Naser (Supervisor)
Abstract
The core behaviour of a nuclear reactor might be fluctuated (deviations from the normal operating conditions) in operating conditions due to various reasons. Control rod vibrations and the alterations of coolant temperature and velocity could be the main reasons for the fluctuations. These fluctuations lead to neutronic flux noise and subsequently power noise. The main objective of the current thesis was to study the thermal-hydraulic noise of the PWRs in two-phase with the emphasis on VVER-1000, which is similar to the Bushehr-1 nuclear reactor. By considering the possibility of existing two-phase flow (maximum allowable quality is about 14%) in hot channel of the PWRs, thermal-hydraulic...
Investigation into the capability of a modern decline curve analysis for gas condensate reservoirs
, Article Scientia Iranica ; Vol. 18, issue. 3 C , June , 2011 , p. 491-501 ; ISSN: 10263098 ; Gerami, S ; Masihi, M ; Sharif University of Technology
Abstract
Techniques of production data analysis for single-phase oil and gas reservoirs have advanced significantly over the past few years. These techniques range from traditional (Arps and Fetkovich) to modern (for the variation of operating conditions at the wellbore). The application of these techniques for analysis of the production data of a gas condensate reservoir may not yield reliable answers due to the fact that the flow of fluid in gas condensate reservoirs is not single-phase. This paper presents the treatment of a modern method of production data analysis (single-phase flow) to analyze the production data of a gas condensate reservoir (two-phase flow). For this purpose, a single-phase...
Investigation into the capability of a modern decline curve analysis for gas condensate reservoirs
, Article Scientia Iranica ; Volume 18, Issue 3 C , June , 2011 , Pages 491-501 ; 10263098 (ISSN) ; Gerami, S ; Masihi, M ; Sharif University of Technology
2011
Abstract
Techniques of production data analysis for single-phase oil and gas reservoirs have advanced significantly over the past few years. These techniques range from traditional (Arps and Fetkovich) to modern (for the variation of operating conditions at the wellbore). The application of these techniques for analysis of the production data of a gas condensate reservoir may not yield reliable answers due to the fact that the flow of fluid in gas condensate reservoirs is not single-phase. This paper presents the treatment of a modern method of production data analysis (single-phase flow) to analyze the production data of a gas condensate reservoir (two-phase flow). For this purpose, a single-phase...
Vorticity as a measure of heterogeneity for improving coarse grid generation
, Article Petroleum Geoscience ; Volume 15, Issue 1 , 2009 , Pages 91-102 ; 13540793 (ISSN) ; Muggeridge, A. H ; Ashjari, M. A ; Sharif University of Technology
2009
Abstract
This paper presents a novel coarse grid generation technique based on using vorticity as a measure of the impact of heterogeneity on flow. Vorticity is a maximum when the total flow is high and perpendicular to a large permeability gradient. Maps of vorticity were generated from single-phase flow simulations and used to generate coarse simulation grids from finely gridded geological models. The resulting grid was more refined in areas of high vorticity and coarser in areas of low vorticity. The method is first demonstrated on a simple five-layered model before being applied to three, 2D models of geologically realistic heterogeneity. The homogenized model generated from vorticity maps shows...
Prediction of Joule-Thomson coefficient and inversion curve for natural gas and its components using CFD modeling
, Article Journal of Natural Gas Science and Engineering ; Volume 83 , 2020 ; Naderifar, A ; Farhadi, F ; Pazuki, G ; Sharif University of Technology
Elsevier B.V
2020
Abstract
In this study, three equations of state (EOS) in conjunction with computational fluid dynamics (CFD) modeling were used to predict the Joule – Thomson (JT) process behavior for natural gas and various pure gases. The JT effect is encountered in several industrial applications. The experimental determination of the JT coefficient (JTC) is complicated, and there is little gas pressure-volume-temperature (PVT) data available for estimating these JTC. Thus, the development of an efficient model to predict the JT effect in industrial processes is necessary. This study was carried out to attain a clear view of the single phase-flow of hydrocarbons and nitrogen in the JT process with CFD modeling....
Analysis of well testing results for single phase flow in reservoirs with percolation structure
, Article Oil and Gas Science and Technology ; Volume 76 , 2021 ; 12944475 (ISSN) ; Masihi, M ; Sharif University of Technology
Editions Technip
2021
Abstract
Constructing an accurate geological model of the reservoir is a preliminary to make any reliable prediction of a reservoir's performance. Afterward, one needs to simulate the flow to predict the reservoir's dynamic behaviour. This process usually is associated with high computational costs. Therefore, alternative methods such as the percolation approach for rapid estimation of reservoir efficiency are quite desirable. This study tries to address the Well Testing (WT) interpretation of heterogeneous reservoirs, constructed from two extreme permeabilities, 0 and K. In particular, we simulated a drawdown test on typical site percolation mediums, occupied to fraction "p"at a constant rate Q/h,...