Search for: fluid-injection
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    Analysis of a more realistic well representation during secondary recovery in 3-D continuum models

    , Article Computational Geosciences ; Volume 21, Issue 5-6 , 2017 , Pages 1035-1048 ; 14200597 (ISSN) Sadeghnejad, S ; Masihi, M ; Sharif University of Technology
    The effectiveness of secondary recovery methods in reservoir development studies depends on the knowledge about how fluid-carrying regions (i.e. good-quality rock types) are connected between injection and production wells. To estimate reservoir performance uncertainty, comprehensive simulations on many reservoir model realisations are necessary, which is very CPU consuming and time demanding. Alternatively, we can use much simpler and physically based methods such as percolation approach. Classic percolation assumes connectivity between opposite 2-D faces of a 3-D system; whereas, hydrocarbon production is achieved through active wells that are one-dimensional lines (e.g. vertical,... 

    An experimental investigation of silica nanoparticles effect on the rheological behavior of polyacrylamide solution to enhance heavy oil recovery

    , Article Petroleum Science and Technology ; Volume 31, Issue 5 , 2013 , Pages 500-508 ; 10916466 (ISSN) Maghzi, A ; Mohebbi, A ; Kharrat, R ; Ghazanfari, M. H ; Sharif University of Technology
    The use of polymer flooding as one of enhanced oil recovery methods has recently increased. The occurrence of high shear rates in reservoir and near well bore through perforation nozzles during polymer flooding cause shear degradation of polymers and therefore polymer viscosity has decreased. Rheological behavior of polymer solution in different conditions of oil reservoir is one of the key factors to develop use of polymer solutions. A few researches are available regarding improving rheological behavior of polymeric solution. In this study, to investigate the effect of nanoparticles on rheological behavior of polymer solutions two samples were prepared: polyacrylamide solution in water and... 

    Experimental investigation of CO2 WAG injection to light crude oil in near miscible conditions

    , 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 ; 2012 , Pages 3914-3918 ; 9781629937908 (ISBN) Shahrokhi, O ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology
    European Association of Geoscientists and Engineers, EAGE  2012
    This work concerns with experimental investigation of CO2 WAG injection to light crude oil in near miscible conditions which has been rarely attended in the available literature. Here, several core flood experiments at three constant injection rates and four WAG ratios are conducted on sandstone rocks saturated with light crude oil in presence of saline water. The results showed that higher injection rate has a better performance regarding oil recovery for smaller PVs of injected fluids, while lower injection rate showed higher ultimate recovery for a 30% increase in injected PVs. Secondary continuous gas injection showed a superior performance than all the other WAG injections in different... 

    Optimal conditions for immiscible recycle gas injection process: A simulation study for one of the Iranian oil reservoirs

    , Article Scientia Iranica ; Volume 18, Issue 6 , 2011 , Pages 1407-1414 ; 10263098 (ISSN) Mohammadi, S ; Kharrat, R ; Khalili, M ; Mehranfar, M ; Sharif University of Technology
    Immiscible gas injection is one of the most common enhanced oil recovery methods used under various reservoir conditions. In this work, the immiscible recycle gas injection, as an EOR scenario for improving recovery efficiency in one of the south-west Iranian oil reservoirs, is simulated by a commercial simulator, ECLIPSE. The reservoir fluid is light oil, with an API of 43. The oil bearing formations are carbonate, and so a dual porosity/dual permeability behavior was chosen for better representation of the fracture system. Different sensitivity analyses with respect to several parameters like the number and location of injection/production wells, production/injection rate, completion... 

    Identification of fluid dynamics in forced gravity drainage using dimensionless groups

    , Article Transport in Porous Media ; Volume 83, Issue 3 , July , 2010 , Pages 725-740 ; 01693913 (ISSN) Rostami, B ; Kharrat, R ; Pooladi Darvish, M ; Ghotbi, C ; Sharif University of Technology
    A number of forced gravity drainage experiments have been conducted using a wide range of the physical and operational parameters, wherein the type, length, and permeability of the porous medium as well as oil viscosity and injection rate were varied. Results indicate that an increase in the Bond number has a positive effect on oil recovery whereas the capillary number has an opposite effect. These trends were observed over a two-order of magnitude change in the value of the dimensionless groups. Furthermore, it was found that use of each number alone is insufficient to obtain a satisfactory correlation with recovery. A combined dimensionless group is proposed, which combines the effect of... 

    Effect of CO2 and crude oil type on the dynamic interfacial tension of crude oil/carbonated water at different operational conditions

    , Article Journal of Petroleum Science and Engineering ; Volume 170 , 2018 , Pages 576-581 ; 09204105 (ISSN) Lashkarbolooki, M ; Riazi, M ; Ayatollahi, S ; Sharif University of Technology
    Elsevier B.V  2018
    Concerns about climate change have persuaded the researchers to examine CO2 injection in the form of carbonated water (CW) into oil reservoir as a safe and effective CO2 storage and enhanced oil recovery process. Although interfacial tension (IFT) between crude oil and injected fluid has a vital role on the displacement of fluids in porous media, the effect of CO2 and crude oil type on the dynamic IFT of crude oil under different operational conditions is not well understood. Accordingly, this study was carried out to assess the effects of temperature, pressure, crude oil type and CO2 on the dynamic IFT of crude oil/CW. To achieve this goal, two types of crude oil were provided from southern... 

    Compare numerical modeling and improved understanding of dynamic sessile drop contact angle analysis in Liquid-Solid-Gas system

    , Article Journal of Petroleum Science and Engineering ; Volume 184 , 2020 Azadi Tabar, M ; Ghazanfari, M. H ; Dehghan Monfared, A ; Sharif University of Technology
    Elsevier B.V  2020
    Dynamic contact angle measurement; as a standard method for surface wettability analysis, is usually conducted through the analysis of sessile drops formed following the low rate injection of fluid from beneath through a drilled hole via an injection needle. However, understanding/characterizing the changes of drop contact angle from the point where the flat solid surface begins is not well discussed yet. Moreover, during the evaluation of size-dependent behavior of contact angle of millimeter-scale drops, the effect of the drilled hole is ignored. In this regard, in the current study, the experimental and thermodynamic characterizations of the sessile drop advancing contact angle... 

    Brine composition effect on the oil recovery in carbonate oil reservoirs: A comprehensive experimental and CFD simulation study

    , Article Journal of Petroleum Science and Engineering ; Volume 191 , August , 2020 Fattahi Mehraban, M ; Rostami, P ; Afzali, S ; Ahmadi, Z ; Sharifi, M ; Ayatollahi, S ; Sharif University of Technology
    Elsevier B. V  2020
    In order to understand the potential role of divalent ions involved in smart water, fluid-fluid and rock-fluid interactions are studied through contact angle and interfacial tension (IFT) measurements. Then, the suitable brines in changing contact angle and IFT are brought into measurement with spontaneous imbibition experiments to evaluate the co-impact of fluid-fluid and rock-fluid interactions. The results show the importance of SO42− ions during smart water injection as removing them from the injection water leads to a sharp drop in ultimate oil recovery. Accordingly, when the concentration of SO42− within the injection water increases four times, 10% ultimate oil recovery is recovered.... 

    A reactive transport approach for modeling scale formation and deposition in water injection wells

    , Article Journal of Petroleum Science and Engineering ; Volume 190 , 2020 Shabani, A ; Sisakhti, H ; Sheikhi, S ; Barzegar, F ; Sharif University of Technology
    Elsevier B.V  2020
    Petroleum industry is moving toward enhancing oil recovery methods, especially water-based methods, including low salinity and smart water flooding which water with an optimized composition is injected into the reservoir for improving oil recovery. Injection of water into the target formation is also a common operation in geothermal energy production. As the water is being injected into the reservoir, pressure and temperature change along the well column and cause scale formation. Mineral scale precipitation and deposition is a common problem for water injection wells which reduces the effective radius of the wellbore and affects the injection efficiency. In this paper, modeling scale... 

    Experimental investigation on synergic effect of salinity and pH during low salinity water injection into carbonate oil reservoirs

    , Article Journal of Petroleum Science and Engineering ; Volume 202 , 2021 ; 09204105 (ISSN) Mehraban, M. F ; Ayatollahi, S ; Sharifi, M ; Sharif University of Technology
    Elsevier B.V  2021
    Interaction between rock-fluid and fluid-fluid can have a significant effect on oil recovery. Changing the wettability of reservoir rock toward more water-wet or less oil-wet state is one of the expected mechanisms during low salinity water injection (LSWI). pH and salinity are of the most eminent factors of injection water controlling the wettability state of a crude oil/brine/rock system during any waterflooding operation. A small change in pH can affect the surface charges at the rock/water and oil/water interfaces leading to wettability alteration in a porous medium. In this study, the synergic effect of salinity and pH on the wettability state of carbonate rocks is evaluated through... 

    Pore-scale insights into sludge formation damage during acid stimulation and its underlying mechanisms

    , Article Journal of Petroleum Science and Engineering ; Volume 196 , 2021 ; 09204105 (ISSN) Mirkhoshhal, S. M ; Mahani, H ; Ayatollahi, S ; Mohammadzadeh Shirazi, M ; Sharif University of Technology
    Elsevier B.V  2021
    Acid-oil emulsion and sludge formation are known as two major formation damage mechanisms and the reason for failure of some acid treatments. The published studies in this area focus primarily on core- to well/reservoir-scale and it is fairly unclear how acid-oil interaction at the pore-scale leads to the formation damage observed at the macro- or core-scale. In this paper, dynamic, micro-scale experiments were designed and executed to investigate the acid-induced formation damage using microfluidic approach. In addition, a series of so-called static (microscope) tests were performed in which acid-crude oil compatibility tests were conducted on a glass slide followed by microscopic... 

    An experimental study on the applicability of water-alternating-co 2 injection in the secondary and tertiary recovery in one iranian reservoir

    , Article Petroleum Science and Technology ; Volume 30, Issue 24 , 2012 , Pages 2571-2581 ; 10916466 (ISSN) Motealleh, M ; Kharrat, R ; Gandomkar, A ; Khanamiri, H ; Nematzadeh, M ; Ghazanfari, M ; Sharif University of Technology
    The objective of this study was to experimentally investigate the performance of water-alternating gas (WAG) injection in one of Iran's oil reservoirs that encountered a severe pressure drop in recent years. Because one of the most appropriate studies to evaluate the reservoir occurs generally on rock cores taken from the reservoir, core samples drilled out of the reservoir's rock matrix were used for alternating injection of water and gas. In the experiments, the fluid system consisted of reservoir dead oil, live oil, Co 2, and synthetic brine; the porous media were a number of carbonate cores chosen from the oilfield from which the oil samples had been taken. All coreflood experiments were... 

    Investigating the fracture network effects on sweep efficiency during wag injection process

    , Article Transport in Porous Media ; Volume 93, Issue 3 , July , 2012 , Pages 577-595 ; 01693913 (ISSN) Dehghan, A. A ; Ghorbanizadeh, S ; Ayatollahi, S ; Sharif University of Technology
    In this study, the main recovery mechanisms behind oil/water/gas interactions during the water-alternating-gas (WAG) injection process, in a network of matrix/fracture, were fundamentally investigated. A visual micromodel was utilized to provide insights into the potential applications of WAG process in fractured oil-wet media as well as the possibility of observing microscopic displacement behavior of fluids in the model. The model was made of an oil-wet facture/matrix network system, comprised of four matrix blocks surrounded with fractures. Different WAG injection scenarios, such as slug arrangements and the effects of fluid injection rates on oil recovery were studied. A new equation... 

    Pareto-based robust optimization of water-flooding using multiple realizations

    , Article Journal of Petroleum Science and Engineering ; Volume 132 , 2015 , Pages 18-27 ; 09204105 (ISSN) Yasari, E ; Pishvaie, M. R ; Sharif University of Technology
    Elsevier  2015
    Robust optimization (RO) approach is inherently a multi-objective paradigm. The proposed multi-objective optimization formulation would attempt to find the optimum - yet robust - water injection policies. Two multi-objective, Pareto-based robust optimization scenarios have been investigated to encounter the permeability uncertainties. These multi-objective RO scenarios have been done based on a small representative set of realizations but they have introduced optimum points that could be reliable for the original set of realizations either. In both scenarios, the desired objective functions are expected value and variance of Net Present Value (NPV). The underlying RO scenarios have been done... 

    A sequential implicit discrete fracture model for three-dimensional coupled flow-geomechanics problems in naturally fractured porous media

    , Article Journal of Petroleum Science and Engineering ; Volume 150 , 2017 , Pages 312-322 ; 09204105 (ISSN) Moradi, M ; Shamloo, A ; Dezfuli, A. D ; Sharif University of Technology
    A sequential implicit numerical method based on discrete-fracture model and the Galerkin Finite Element method, for time-dependent coupled fluid flow and geomechanics problems in fractured subsurface formations is presented. Discrete-fracture model has been used to explicitly represent the fracture network inside porous media. The Galerkin Finite Element method with adaptive unstructured gridding is implemented to numerically solve the spatially three-dimensional and time-dependent problem. The presented method is validated with previously obtained solutions. Two problems are numerically solved by applying the presented methodology in a three-dimensional fractured petroleum reservoir under... 

    Effect of salinity and ion type on formation damage due to inorganic scale deposition and introducing optimum salinity

    , Article Journal of Petroleum Science and Engineering ; Volume 177 , 2019 , Pages 270-281 ; 09204105 (ISSN) Ghasemian, J ; Riahi, S ; Ayatollahi, S ; Mokhtari, R ; Sharif University of Technology
    Elsevier B.V  2019
    Smart water injection is recognized as an effective EOR process to alter the wettability and interfacial tension to obtain higher micro/macro sweep efficiencies. This water contains reactive ions such asMg2+, Ca2+ andSO42- which can act as potential-determining ions and change the surface charge of calcite rocks. One of the major concerns in the execution of an effective water-flood process, especially in tight carbonate reservoirs, is the chemical incompatibility between the formation brine and the injecting water. In the present study, laboratory fluid compatibility tests were carried out and software simulation was done to investigate the most important challenges of the water-flooding... 

    Synthesis of a custom-made suspension of preformed particle gel with improved strength properties and its application in the enhancement of oil recovery in a micromodel scale

    , Article Journal of Petroleum Science and Engineering ; Volume 207 , 2021 ; 09204105 (ISSN) Aqcheli, F ; Baghban Salehi, M ; Taghikhani, V ; Pahlevani, H ; Sharif University of Technology
    Elsevier B.V  2021
    The objective of this work is to develop a new Preformed Particle Gel (PPG) suspension to enhance oil production and monitor water production in a porous medium on micromodel scale. To achieve the above goal, the following synthetic method was used. At the outset, the PPG samples were synthesized with polyethylene amine (PEI) as a crosslinker, 2,2′-Azobis (2-methylpropionamidine) dihydrochloride (AAPH) as initiator and acrylamide (AM) and 2-Acrylamido-2-methylpropanesulfonic acid (AMPS) monomers to improve the strength properties of PPGs by the radical polymerization method. Also, to characterize the micro and macro structural the samples, the scanning electron microscopy (SEM),... 

    Characterizing the Role of Shale Geometry and Connate Water Saturation on Performance of Polymer Flooding in Heavy Oil Reservoirs: Experimental Observations and Numerical Simulations

    , Article Transport in Porous Media ; Volume 91, Issue 3 , 2012 , Pages 973-998 ; 01693913 (ISSN) Mohammadi, S ; Masihi, M ; Ghazanfari, M. H ; Sharif University of Technology
    Many heavy oil reservoirs contain discontinuous shales which act as barriers or baffles to flow. However, there is a lack of fundamental understanding about how the shale geometrical characteristics affect the reservoir performance, especially during polymer flooding of heavy oils. In this study, a series of polymer injection processes have been performed on five-spot glass micromodels with different shale geometrical characteristics that are initially saturated with the heavy oil. The available geological characteristics from one of the Iranian oilfields were considered for the construction of the flow patterns by using a controlled-laser technology. Oil recoveries as a function of pore...