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Characterization of essential oil components of Iranian geranium oil using gas chromatography-mass spectrometry combined with chemometric resolution techniques
, Article Journal of Chromatography A ; Volume 1114, Issue 1 , 2006 , Pages 154-163 ; 00219673 (ISSN) ; Zekavat, B ; Sereshti, H ; Sharif University of Technology
2006
Abstract
The essential oil components of geranium oil cultivated in center of Iran were identified and determined using gas chromatography-mass spectrometry data combined with the chemometric resolution techniques. A total of 61 components accounting for 91.51% were identified using similarity searches between the mass spectra and MS database. This number was extended to 85 components using chemometric techniques. Various chemometric methods such as morphological scores, simplified Borgen method (SBM) and fixed size moving window evolving factor analysis (FSMWEFA) were used for determining the number of components, pure variables, zero concentration and selective regions. Then the overlapping peak...
The non-linear effect of oil polarity on the efficiency of low salinity waterflooding: A pore-level investigation
, Article Journal of Molecular Liquids ; January , 2021 ; 01677322 (ISSN) ; Mohammadi, S ; Mahani, H ; Ayatollahi, S ; Sharif University of Technology
Elsevier B. V
2021
Abstract
Oil polarity is an important property impacting the efficiency of low salinity waterflooding (LSWF). It directly affects fluid/fluid and rock/fluid interactions, controlling the interfacial properties and forces. However, the current findings in the literature on the effect of concentration of polar components on oil recovery by LSWF are contradictory. Therefore, the main objective of this paper is to investigate how the type of non-polar fractions and the concentration of acidic polar oil constituents change the trapped oil saturation at the pore-scale during LSWF. In this regard, we conducted a series of microfluidics LSWF experiments in both secondary and tertiary modes, using clay-free...
Experimental investigation of tertiary oil gravity drainage in fractured porous media
, Article Special Topics and Reviews in Porous Media ; Volume 1, Issue 2 , 2010 , Pages 179-191 ; 21514798 (ISSN) ; Rostami, B ; Kharrat, R ; Ayatollahi, Sh ; Ghotbi, C ; Sharif University of Technology
2010
Abstract
The amount of residual oil trapped in the matrix of a fractured reservoir after water drive, either natural water drive or water injection, depends on the wettability of the matrix rocks. Gas oil gravity drainage (GOGD) has been proposed as the tertiary oil recovery process for this type of oil reservoir. The current work focuses on experimental investigation of tertiary GOGD in fractured porous media under different types of matrix wettability. Results of a set of experiments performed in artificial porous media composed of sand packs and glass beads of different wettability have been used to check the GOGD rate and the ultimate oil recovery for previously waterflooded models. A novel...
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 ; 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....
Effect of time and temperature on crude oil aging to do a right surfactant flooding with a new approach
, Article Proceedings of the Annual Offshore Technology Conference ; Vol. 2, issue , 2014 , p. 1136-1142 ; ISSN: 01603663 ; ISBN: 9781632663870 ; Habibi, A ; Ayatollahi, S ; Masihi, M ; Ashoorian, S ; Sharif University of Technology
Abstract
Dilute Surfactant flooding has been recognized as one of the significant processes in chemical flooding. Many oil reservoirs became appropriate candidates for surfactant/water flooding when screening criteria was developed. Injected surfactant tried to mobilize the residual oil that was trapped in interstice. The main contributing mechanism to enhance oil recovery by surfactant flooding was defined as rock wettability alteration. Wettability is one of the substantial parameters to choose the best approach for a successful surfactant flooding in which tiny change in wettability will lead to improve oil recovery fundamentally. In this experimental study the effect of different aging time and...
Toward reservoir oil viscosity correlation
, Article Chemical Engineering Science ; Volume 90 , 2013 , Pages 53-68 ; 00092509 (ISSN) ; Khishvand, M ; Naseri, A ; Mohammadi, A. H ; Sharif University of Technology
2013
Abstract
Oil viscosity plays a key role in reservoir simulation and production forecasting, as well as planning thermal enhanced oil recovery methods and these make its accurate determination necessary. In this communication, the most frequently used oil viscosity correlations are evaluated using a large databank of Iranian oil reservoirs which were measured using a Rolling Ball viscometer (Ruska, series 1602). To evaluate the performance and accuracy of these correlations, statistical and graphical error analyses have been used simultaneously. Three of the most accurate correlations for each region, including dead oil viscosity, viscosity below bubble point, viscosity at bubble point and the...
Experimental investigation of asp flooding in fractured heavy oil five-spot systems
, 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 3924-3928 ; 9781629937908 (ISBN) ; Ghazanfari, M. H ; Masihi, M ; Rashtchian, D ; Sharif University of Technology
European Association of Geoscientists and Engineers, EAGE
2012
Abstract
Although alkaline-surfactant-polymer flooding is proved to be efficient for oil recovery from heavy oil reservoirs, the displacements mechanism/efficiency of this process in fractured systems needs to more discussion, especially in five-spot patterns. In this work, several ASP flooding test were performed on fractured micromodels which were initially saturated with heavy oil at constant flow rate and different fracture geometrical characteristics conditions. The ASP solutions are constituted from 5 polymers i.e. four synthetic polymers include three hydrolyzed polyacrylamide with different molecular weight as well as a non-hydrolyzed polyacrylamide and a biopolymer, 2 surfactants i.e. a...
Preliminary considerations on the application of toe-to-heel steam flooding (THSF): Injection well-producer well configurations
, Article Chemical Engineering Research and Design ; Volume 89, Issue 11 , 2011 , Pages 2365-2379 ; 02638762 (ISSN) ; Yadali Jamaloei, B ; Sharif University of Technology
Abstract
This work examines the operational parameters that may influence the performance of toe-to-heel steamflooding in a laboratory-scale simulation model built on the basis of the fluid and rock samples from a fractured, low-permeable, carbonate heavy oil reservoir in Southwestern Iran, called KEM (Kuh-e-Mond). Using vertical (V) or horizontal (H) injectors (I) and producers (P), the effects of different well configurations including VIVP, VIHP, 2VIHP, VI2HP, HIHP, and HI2HP, injectors' traversal distance, producers' traversal distance, and horizontal producer length have been investigated. In summary, the results show that 2VIHP scheme performs best in terms of oil recovery and areal/volumetric...
An unsteady state retention model for fluid desorption from sorbents
, Article Journal of Colloid and Interface Science ; Volume 450 , July , 2015 , Pages 127-134 ; 00219797 (ISSN) ; Sadeghi, H ; Garcia Mayoral, R ; McKay, G ; Sharif University of Technology
Academic Press Inc
2015
Abstract
New studies regarding the sorption of fluids by solids are published every day. In performance testing, after the sorbent has reached saturation, it is usually removed from the sorbate bath and allowed to drain. The loss of liquid from the sorbents with time is of prime importance in the real-world application of sorbents, such as in oil spill response. However, there is currently no equation used for modeling the unsteady state loss of the liquid from the dripping sorbent. Here, an analytical model has been provided for modeling the dynamic loss of liquid from the sorbent in dripping experiments. Data from more than 60 sorbent-sorbate systems has been used to validate the model. The...
Experimental investigation of heavy oil recovery by continuous/WAG injection of CO2 saturated with silica nanoparticles
, Article International Journal of Oil, Gas and Coal Technology ; Volume 9, Issue 2 , 2015 , Pages 169-179 ; 17533317 (ISSN) ; Khezrnejad, A ; Shahrokhi, O ; Ghazanfari, M. H ; Vossoughi, M ; Sharif University of Technology
Inderscience Enterprises Ltd
2015
Abstract
In this work, application of CO2 saturated with silica nanoparticles in continuous/water alternating gas (WAG) injection for heavy oil recovery was investigated which has been rarely attended in the available literature. Core displacement tests were conducted to monitor heavy oil recovery in both continuous and WAG injection schemes. It has been observed that for continuous nano-saturated CO2 injection, the oil recovery is higher than pure CO2 injection. This observation might be explained by alteration of rock wettability to a more water-wet condition. In WAG injection scheme, water breakthrough happened later in nano-saturated CO2 than pure CO2 injection. This delayed water breakthrough...
Macroscopic and microscopic investigation of alkaline-surfactant-polymer flooding in heavy oil recovery using five-spot micromodels: The effect of shale geometry and connatewater saturation
, Article Journal of Porous Media ; Volume 18, Issue 8 , 2015 , Pages 745-762 ; 1091028X (ISSN) ; Ghazanfari, M. H ; Masihi, M ; Rashtchian, D ; Sharif University of Technology
Begell House Inc
2015
Abstract
Plenty of oil reservoirs contain discontinuous shale layers that act as flow barriers. Therefore, understanding their influences on reservoir performance, especially during enhanced oil recovery (EOR) processes, is of great importance. For this purpose, several experiments of water and alkaline-surfactant-polymer (ASP) flooding have been performed on a number of one-quarter five-spot micromodels that contain various configurations of shale layers to simulate shaly porous media. Several features, such as various shale geometrical characteristics and the presence of connate water saturation, were investigated at both macro- and micro-scales. The presence of shales resulted in earlier...
Application of different novel and newly designed commercial ionic liquids and surfactants for more oil recovery from an Iranian oil field
, Article Journal of Molecular Liquids ; Volume 230 , 2017 , Pages 579-588 ; 01677322 (ISSN) ; Ayatollahi, S ; Keshavarz, P ; Sharif University of Technology
Elsevier B.V
2017
Abstract
This investigation is conducted on one of the southern Iranian oil fields, which experiences a fault on its gas cap. Therefore, no traditional gas injection and normal water injection for pressure maintenance is suggested. The target is set to inject special compatible and proper type of chemicals in each single well to avoid the pressure increase for the risk of oil and gas spill. Two different sources of aqueous phases, namely formation brine and sea water were used to find the effects of different brine composition on the main mechanisms of releasing the trapped oil, interfacial tension (IFT) and wettability alteration. The obtained results reveal that both the ionic liquid (IL) based...
Activating solution gas drive as an extra oil production mechanism after carbonated water injection
, Article Chinese Journal of Chemical Engineering ; Volume 28, Issue 11 , 2020 , Pages 2938-2945 ; Ayatollahi, S ; Riazi, M ; Sharif University of Technology
Materials China
2020
Abstract
Enhanced oil recovery (EOR) methods are mostly based on different phenomena taking place at the interfaces between fluid–fluid and rock–fluid phases. Over the last decade, carbonated water injection (CWI) has been considered as one of the multi-objective EOR techniques to store CO2 in the hydrocarbon bearing formations as well as improving oil recovery efficiency. During CWI process, as the reservoir pressure declines, the dissolved CO2 in the oil phase evolves and gas nucleation phenomenon would occur. As a result, it can lead to oil saturation restoration and subsequently, oil displacement due to the hysteresis effect. At this condition, CO2 would act as in-situ dissolved gas into the oil...
Comparing the performance and recovery mechanisms for steam flooding in heavy and light oil reservoirs
, Article Society of Petroleum Engineers- SPE Heavy Oil Conference ; Volume 1 , 2012 , Pages 28-36 ; 9781622761111 (ISBN) ; Ayatollahi, S ; Shabaninejad, M ; Sharif University of Technology
SPE
2012
Abstract
The concern over fossil energy shortage for the next decade leads to the extensive research activities in the area of enhanced oil recovery. Steam injection as one of well known EOR process has been used for about five decades to improve the oil production rate and recovery efficiency. Steam flooding is applied to heavy and extra-heavy oil reservoirs; however it could be used in light oil reservoirs in which water injection do not work effectively. Regardless of different performances, this method is an efficient EOR process for both heavy and light oil reservoirs. In this work, two separate numerical models were prepared to investigate steam flooding performance for the recovery of light...
Super Heavy Crude Oil Refinery Project Feasibility Study
, M.Sc. Thesis Sharif University of Technology ; Safaeih, Mohammad Reza (Supervisor)
Abstract
The market demand of super heavy crude oil is very low due to its determinative both physical and chemical properties. Unfortunately existing refineries in Iran are not capable to refine this kind of crude oil. Marketing issues besides great price difference with other crude oil types leads us to find economical solution for optimal use of this national possession. About 70 percent of super heavy crude oil produced from Soroush and Norouz oil fields is un-refineable materials and to refine this heavy crude oil to refinery products like gasoline or gas oil a refinery with RFCC ( Residual Fluid Catalitic Cracking) technology must be made. Super high Technology and very heavy capital cost...
Investigation of the IFT Behavior of Foamy Oil or Water in Oil Emulsions at Reservoir Condition in Water Based EOR Techniques
, M.Sc. Thesis Sharif University of Technology ; Ayatollahi, Shahabedin (Supervisor) ; Taghikhani, Vahid (Supervisor)
Abstract
Foamy oil reservoirs and reservoirs which have water in oil emulsions have some difficulties through production with water based enhanced oil recovery techniques. Study of IFT of these oils may improve production of these reservoirs, especially for water based techniques which are most popular techniques. In this study, IFT of these oils were studied in reservoir condition. Effects of pressure, temperature and water composition were investigated. These effects were studied through Pendant drop technique and VIT apparatus
Improvement of Edible Oil by Interestrification Process by Lipase
, M.Sc. Thesis Sharif University of Technology ; Alemzadeh, Iran (Supervisor) ; Razavi, Jalil (Supervisor)
Abstract
Fats and oils are one of the main human food diet components that provide the necessary fatty acids for our body. So the fatty acids available in consuming oils are so important. In this research the mixture of palm and sunflower oils with different compounds: (80:20, 60:40, 50:50, 40:60, 20:80) were used for preparing free- trans shortening by interesterification. For this purpose a special stabilized lipase (Lipozyme TLIM) were used and performed the physicochemical properties: free fatty acids, peroxide value, iodine value, slip melting point, solid fat content, P-anisidine value, soap, oxidative stability at 110 0C, and the profile of fatty acids on the primitive blends and final samples...
Evaluation of the Impact of Changes in Properties of Crude Oil on Technical Features of Petroleum Supply Chain
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
Energy system of each country include of extraction, processing, conversion, transportation and distribution levels. Crude oil is one of the energy carrier which has dominant share to meet energy demand in industry and transportation sectors. Therefore, studying of physical properties changes of this energy carrier during production period is obligatory. The goal of this research is to model quality reduction of crude oil during production period of naturally occurring reservoirs. In this research quality of crude oil has been investigated inside of reservoir and after production and the effect of quality changes in before mentioned conditions according to cumulative production of reservoirs...
Application of genetic algorithm for optimization of separator pressures in multistage production units
, Article Chemical Engineering Communications ; Vol. 201, issue. 7 , 2014 , p. 926-938 ; Ebrahimi, A. N ; Pishvaie, M. R ; Sharif University of Technology
Abstract
In this article, a genetic algorithm is used to optimize the separator pressures in a multistage crude oil and multistage gas condensate production unit with four and three separators respectively. This leads to the generation of more accurate results for the quality and quantity of oil remaining in the stock tank for both crude oil and gas condensate production units. Genetic-based optimized pressures for crude oil separators resulted in 1.8% and 2% enhancement in oil remaining in the stock tank for summer and winter respectively. API gravity of the stock tank oil was improved 2.4% in summer and 2.2% in winter. For the gas condensate production unit, optimized pressures can enhance by 8.6%...
Using the laser irradiation to improve the rate of production of Iran South West formation
, Article Society of Petroleum Engineers - Kuwait International Petroleum Conference and Exhibition 2012, KIPCE 2012: People and Innovative Technologies to Unleash Challenging Hydrocarbon Resources ; Volume 1 , 2012 , Pages 141-147 ; 9781622769766 (ISBN) ; Habibpour, M ; Jalalyfar, H ; Geranmayehrad, A ; Sharif University of Technology
2012
Abstract
Whole level of the erosion and the resistance of rocks which were composed closured have been studied, besides, the impact of temperature and laser irradiation for more investigation about this issue has been involved before all. This subject more reveals the matter which laser absorption on the laboratory scale using laser to what extent can cause the augment of the relative permeability and secondary porosity of reservoir rock, that of the vertical and horizontal useful connectivity and eventually that of the positive transferability. This research has been carried out in the form of case study on one of Iranian south west formations in north east of Behbahan city in Iran, either the rate...