Loading...
Search for: relative-permeability
0.009 seconds
Total 80 records

    Wettability alteration of reservoir rocks to gas wetting condition: a comparative study

    , Article Canadian Journal of Chemical Engineering ; Volume 96, Issue 4 , April , 2018 , Pages 997-1004 ; 00084034 (ISSN) Erfani Gahrooei, H. R ; Ghazanfari, M. H ; Karimi Malekabadi, F ; Sharif University of Technology
    Wiley-Liss Inc  2018
    Abstract
    Productivity of gas condensate reservoirs reduces significantly due to the near wellbore condensate/water blockage phenomenon. A novel, permanent solution to alleviate this problem is near wellbore wettability alteration of reservoir rocks to preferentially gas wetting conditions; industrial chemical materials are good candidates for this purpose, because of their eco-friendly characteristics, economical price, and mass production. In this paper, a comparative study is conducted on two industrial fluorinated chemicals, MariSeal 800 and SurfaPore M. Static and dynamic contact angle measurements, spontaneous imbibition, and core flooding tests were conducted to investigate the effect of... 

    A novel two-parameter relative permeability model

    , Article Journal of Porous Media ; Volume 15, Issue 11 , 2012 , Pages 1061-1066 ; 1091028X (ISSN) Ghoodjani, E ; Bolouri, S. H ; Sharif University of Technology
    B. House  2012
    Abstract
    The relative permeability curves are key factors for assessment of reservoir performance by numerical simulators. The widely used one-parameter models are not sufficiently flexible for fitting laboratory measured relative permeability data. These models only show a concave upward trend and cannot represent the S-shape behavior of relative permeability. The other three-parameter models are too complex to use in practical reservoir engineering calculations. In this paper, a novel two-parameter model is proposed that maintains the simplicity of previous models while having great flexibility over a full range of saturation. The two parameters L and U control the shape of the lower and upper part... 

    An Experimental Investigation of Three-Phase Flow of water-Oil-Gas Mixture Through Water-wet Sandstone

    , M.Sc. Thesis Sharif University of Technology Javanbakht, Leila (Author) ; Masihi, Mohsen (Supervisor)
    Abstract
    Accurate prediction of relative permeability for various reservoir rocks at various saturation conditions has been of concern for a long time in petroleum industry. Relative permeability is known as one of the most significant parameters in simulation of actual multi-phase flow through porous media during life-time of a hydrocarbon reservoir. In addition, it plays important role in oil production and well completion. Direct experimental measurement in order to determine relative permeability of porous rock has long been recorded in petroleum related literature. However, empirical methods for determining relative permeability are becoming more widely used, particularly with the advent of... 

    Experimental investigation of near miscibility effect on relative permeability curves

    , Article 74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources, 4 June 2012 through 7 June 2012 ; June , 2012 , Pages 5469-5474 ; 9781629937908 (ISBN) Parvazdavani, M ; Masihi, M ; Ghazanfari, M. H ; Sharif University of Technology
    European Association of Geoscientists and Engineers, EAGE  2012
    Abstract
    The requirement of reliable relative permeability data is more intensified when the miscibility condition approaches. In this work the relative permeability of CO2 and oil has been measured at different miscibility conditions using conventional methods. Fractured dolomite and sandstone core plugs samples were used in the experiments. Due to some errorful assumptions of conventional methods such as immiscible, incompressible displacement, inverse modeling was used for predicting the reliable relative permeability of oil and gas phases at near miscible condition from measured oil production and pressure drop data. The initial guesses of relative permeabilities were provided from conventional... 

    Experimental study and calculation of CO 2-oil relative permeability

    , Article Petroleum and Coal ; Volume 53, Issue 2 , 2011 , Pages 123-131 ; 13377027 (ISSN) Ghoodjani, E ; Bolouri, S. H ; Sharif University of Technology
    2011
    Abstract
    Carbon dioxide-oil relative permeability is measured under reservoir condition using core flood apparatus. Then the results are compared with Nitrogen-oil relative permeability. The results show that oil permeability is higher in Carbon dioxide injection compared to nitrogen injection. The comparison of gas permeabilities shows that at the start of injection, nitrogen and carbon dioxide relative permeability are equal, but as the gas saturation increased, Nitrogen relative permeability becomes higher. Finally, a method is proposed to calculate carbon dioxide-oil relative permeability from nitrogen-oil relative permeability. This method can be generalized to calculate relative permeability... 

    The dependency of relative permeability on dominated flow regimes under gas gravity assisted flow

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 33, Issue 2 , Oct , 2011 , Pages 101-113 ; 15567036 (ISSN) Rostami, B ; Kharrat, R ; Pooladi Darvish, M ; Ghotbi, C ; Sharif University of Technology
    2011
    Abstract
    Gas-oil relative permeability is essential for performance predictions of reservoirs with solutions for gas drive, gas cap expansion, or gas injection. The nature of flow in reservoir is determined by the interplay of relative permeability and viscous, gravity, and capillary forces. Displacement experiments of the gas-oil system are performed on long core scale models by varying the petrophysical properties and flow conditions. Experiments are conducted in situations where capillary, gravity, and viscous forces are comparable. The effect of destabilized front velocity on relative permeability and residual saturation is investigated. The results indicate that the relative permeability varies... 

    Relative permeability and capillary pressure curves for low salinity water flooding in sandstone rocks

    , Article Journal of Natural Gas Science and Engineering ; Volume 25 , July , 2015 , Pages 30-38 ; 18755100 (ISSN) Shojaei, M. J ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology
    Elsevier  2015
    Abstract
    Recently much attention has been paid to the use of low salinity water (LSW) as an enhanced oil recovery fluid. The change observed in recovery factor during LSW flooding is induced from changes in relative permeability and capillary pressure when different levels of salinity are used. However, a few researchers tried to evaluate how macroscopic flow functions depend on the salinity of the injected water. To this end, a series of oil displacement by water was performed on a sandstone rock aged with crude oil in the presence of connate water. The capillary pressure and relative permeability curves are evaluated from inverse modeling of the obtained pressure drop and oil production data. Then,... 

    A numerical study of micro-heterogeneity effects on upscaled properties of two-phase flow in porous media

    , Article Transport in Porous Media ; Volume 56, Issue 3 , 2004 , Pages 329-350 ; 01693913 (ISSN) Das, D. B ; Hassanizadeh, S. M ; Rotter, B. E ; Ataie Ashtiani, B ; Sharif University of Technology
    2004
    Abstract
    Commonly, capillary pressure-saturation-relative permeability (Pc-S-Kr) relationships are obtained by means of laboratory experiments carried out on soil samples that are up to 10-12 cm long. In obtaining these relationships, it is implicitly assumed that the soil sample is homogeneous. However, it is well known that even at such scales, some micro-heterogeneities may exist. These heterogeneous regions will have distinct multiphase flow properties and will affect saturation and distribution of wetting and non-wetting phases within the soil sample. This, in turn, may affect the measured two-phase flow relationships. In the present work, numerical simulations have been carried out to... 

    Effects of heterogeneities on capillary pressure-saturation-relative permeability relationships

    , Article Journal of Contaminant Hydrology ; Volume 56, Issue 3-4 , 2002 , Pages 175-192 ; 01697722 (ISSN) Ataie Ashtiani, B ; Majid Hassanizadeh, S ; Celia, M. A ; Sharif University of Technology
    2002
    Abstract
    In theories of multiphase flow through porous media, capillary pressure-saturation and relative permeability-saturation curves are assumed to be intrinsic properties of the medium. Moreover, relative permeability is assumed to be a scalar property. However, numerous theoretical and experimental works have shown that these basic assumptions may not be valid. For example, relative permeability is known to be affected by the flow velocity (or pressure gradient) at which the measurements are carried out. In this article, it is suggested that the nonuniqueness of capillary pressure-relative permeability-saturation relationships is due to the presence of microheterogeneities within a laboratory... 

    A laboratory study of gas-oil relative permeability during CO2 Injection

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 36, Issue. 17 , 2014 , pp. 18571864 ; ISSN: 15567036 Ghoodjani, E ; Bolouri, S. H ; Sharif University of Technology
    Abstract
    Gas injection is the second largest enhanced oil recovery process being applied in many reservoirs around the world. Simulation of these processes is necessary for implementation, management, and decision making. Relative permeability is one of the most important factors in numerical reservoir simulation. In this study, several core flood experiments are done and the relative permeability in carbon dioxide (CO2) injection is compared with nitrogen (N2) injection. Oil relative permeability in CO 2 injection is found to be higher than in N2 injection, but gas relative permeability in CO2 injection is found to be lower than in N2 injection. Higher oil relative permeability in CO 2 injection... 

    Investigating the role of ultrasonic wave on two-phase relative permeability in a free gravity drainage process

    , Article Scientia Iranica ; Vol. 21, issue. 3 , 2014 , p. 763-771 Keshavarzi, B ; Karimi, R ; Najafi, I ; Ghazanfari, M. H ; Ghotbi, C ; Sharif University of Technology
    Abstract
    In this work, the process of free gravity drainage under the influence of ultrasonic waves was investigated. A glass bead pack porous medium was used to perform free fall gravity drainage experiments. The tests were performed in the presence and absence of ultrasonic waves, and the data of recovery were recorded versus time under both conditions. The wetting phase relative permeability curves were obtained using the data of recovery versus time, based on the Hagoort backward methodology. Subsequently, using the wetting phase relative permeability curve, the relative permeability of non-wetting phases were calculated by performing history matching to the experimental production data. The... 

    Experimental Investigation of Brine Salinity Effect on Relative Permeability Curve in Tight Reservoir

    , M.Sc. Thesis Sharif University of Technology Zeinolabedin, Roham (Author) ; Shad, Saeed (Supervisor)
    Abstract
    An experimental study was conducted to investigate the reduction of relative permeability caused by salt precipitation. Series of isothermal sand pack flood experiments were conducted on a sand pack composed of several minerals and relative permeability of the involved phases were determined. This compose was taken south of Iranian reservoir properties. A stainless steel sand-pack of 2.5cm internal diameter and 19.2 cm long was designed and built for experimental procedure. There are is different methods to determine relative permeability of porous media, According to available facilities in the lab and objective of this study unsteady state have been chosen to determine relative... 

    Experimental Investigation on the Effect of Porous Media Wettability on Trapping and Hysteresis in Water/Oil Two Phase Flow System

    , M.Sc. Thesis Sharif University of Technology Firoozi, Mehdi (Author) ; Fatemi, Mobeen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor)
    Abstract
    Wettability of reservoir rock is one of the effective parameters in determining the mechanisms of production and consequently the amount of residual oil inside the porous media. In addition, the salinity of injected water is important factor in the recovery of reservoir oil in waterflooding.On the other hand, the role of the hysteresis on the residual oil saturation as well as the flow functions such as relative permeability curves is very important. In this project, the effects of reservoir wettability and injected water salinity on the hysteresis and residual oil saturation in two-phase water-oil flow systems are studied. Core-scale experiments were carried out using sandpacks and were... 

    Monitoring the influence of dispersed nano-particles on oil-water relative permeability hysteresis

    , Article Journal of Petroleum Science and Engineering ; Vol. 124, issue , December , 2014 , p. 222-231 ; ISSN: 09204105 Parvazdavani, M ; Masihi, M ; Ghazanfari, M. H ; Sharif University of Technology
    Abstract
    In recent years, polysilicon nanoparticles are used to enhance the oil recovery through the water injection process in oilfields. The contributing mechanisms are the reduction of interfacial tension and wettability alteration which lead to improving or decreasing the oil phase relative permeability and can be traced by change of relative permeability curves. However, profound understanding of the effect of dispersed nano-silica particles on the hysteretic behavior of relative permeability curves remains a controversy topic in the literature.The current study illustrates the influence of dispersed silica particles on hysteretic trend of two-phase curves of oil-water relative permeability.... 

    Gas-oil relative permeability and residual oil saturation as related to displacement instability and dimensionless numbers

    , Article Oil and Gas Science and Technology ; Volume 65, Issue 2 , 2010 , Pages 299-313 ; 12944475 (ISSN) Rostami, B ; Kharrat, R ; Ghotbi, C ; Tabatabaie, S. H ; Sharif University of Technology
    2010
    Abstract
    Displacement experiments of the gas-oil system are performed on long core scale models by varying the petrophysical properties and flowing conditions. Experiments are conducted in situations where capillary, gravity and viscous forces are comparable. From oil production history and picture analysis, the threshold for the stability is determined. The experimental findings are comparable to the results of a gradient percolation theory. The effect of destabilized front velocity on relative permeability and residual saturation is investigated. The relative permeabilities determined by using analytical and numerical approaches indicate that higher displacement velocity leads to a higher gas... 

    Experimental Investigation of CO2-Oil Relative Permeability

    , M.Sc. Thesis Sharif University of Technology Ghoodjani, Eshragh (Author) ; Vossughi, Manouchehr (Supervisor) ; Shadizadeh, Reza (Supervisor) ; Kharrat, Reyaz (Supervisor) ; Ghazanfari, Mohammad Hossain (Co-Advisor)
    Abstract
    Relative permeability is an important factor that controls the two phase fluid flow in porous media. The use of carbon dioxide in enhanced oil recovery methods is common. But the question is, how does the carbon dioxide affect the relative permeability curves? In this thesis, the CO2-oil relative permeability is measured in CO2 flooding process with unsteady state method. For this purpose, the core flooding apparatus is used and the results are compared with N2-oil relative permeability in N2 flooding. The results of comparison show that oil relative permeability in CO2 flooding is higher than N2 flooding. Reduction of Interfacial tension and oil viscosity, solubility of CO2 in oil and oil... 

    Experimental and Modeling Study of Two-Phase Relative Permeability at Near Miscible Condition

    , M.Sc. Thesis Sharif University of Technology Parvazdavani, Mohammad (Author) ; Masihi, Mohsen (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Rasaei, Mohammad Reza (Supervisor)
    Abstract
    One of the main parameters in modeling of two phase gas and oil flow is an accurate relative permeability functions. This importance will be more intensified when the miscibility condition approaches. In miscible condition due to reduction of interfacial tension between oil and gas phases, parameters of conventional relative permeability functions will change and this changing affects on production results such as oil and gas recovery and also pressure drop along the core. All of the previous studies could not present a unique and consistent model to show the effect of near miscibility condition on relative permeability curves. In this work, these changing of parameters will be investigated... 

    Development of a One-Dimensional Compositional Simulator to Account for the Effects of Different Relative Permeability Models in Gas Condensate Reservoirs

    , M.Sc. Thesis Sharif University of Technology Mae’soumi Gholghouchan, Ali (Author) ; Masihi, Mohsen (Supervisor) ; Gerami, Shahab (Co-Advisor)
    Abstract
    As the published statistics of prestigious international institutes show, the share of natural gas from the energy basket of the world is rising. This increase is due to some reasons such as decrease in oil reserves, discovery of new gas fields, lower environmental problems, etc. The Islamic Republic of Iran is not an exception of this rule; but also because of huge gas reservoirs that Iran has, it becomes very important for the Iranian government. Hence, research for predicting the behavior of such reservoirs is a necessary need of oil and gas industry.Both thermodynamic and flow behavior of gas condensate fluids are more complicated than other reservoir fluids. Its complex thermodynamic... 

    Evaluation of using Lattice Boltzmann Method for Simulation of Two Phase Flow in Saturated Porous Media

    , M.Sc. Thesis Sharif University of Technology Sheik, Bahman (Author) ; Pak, Ali (Supervisor)
    Abstract
    Fluid flow in porous media is a common phenomenon in the nature, in many fields of science and engineering such as flow of water in the soil, migration of contaminants in the soil, petroleum reservoir engineering, semi?olten magma flow in the crust, water flow in plants, blood flow in body tissues, etc. In many cases, the porous structure of the medium and fluid flow pattern are very complex because of the inherent problems of fluidAluid and fluidsolid interactions. Also, secondary issues such as intrinsic permeability and tortuosity of porous media, and relative permeability of two phase flow, increase the complication of the analyses. Studying these types of phenomena in the nature or even... 

    Experimental and Modeling Study of Controlled Salinity Water Injection for Enhanced Oil Recovery from one of Iranial Oil Reservoirs

    , M.Sc. Thesis Sharif University of Technology Shojaei, Mohammad Javad (Author) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Masihi, Mohsen (Co-Advisor)
    Abstract
    From previous years, water injection was considered as one of the most common methods for enhanced oil recovery. But recently much attention has been paid on the use of low salinity water (LSW) as an enhanced oil recovery fluid. The main mechanism that causes improve oil recovery is wettability alteration to a more water wet state. The change observed in recovery factor during LSW flooding induced from changes in relative permeability and capillary pressure when different levels of salinity are used. However, a few researchers tried to evaluate how macroscopic flow functions depend on the salinity of injected water. To this end, a series oil displacements by water performed on sandstone rock...