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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) ; 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...
An experimental investigation of three-phase flow through water-wet rocks
, Article 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 ; Volume 5 , 2010 , Pages 3924-3928 ; 9781617386671 (ISBN) ; Javanbakht, L ; Sharif University of Technology
Society of Petroleum Engineers
2010
Abstract
Petroleum production often involves simultaneous flow of three immiscible fluids through porous rock formations. The objective of this work is to experimentally measure two and three phase relative permeabilities and to evaluate the existing relative permeability prediction models. We used typical Berea sandstone with refined mineral oil, distilled water and nitrogen gas. The measurements were carried out at temperature of 23°C and pressure of 800 psi. Two and three phase relative permeability measurements were obtained using the steady state technique. The three-phase experiments are conducted in the imbibition mode. The flow rates of brine and gas were increased gradually and the oil rate...
Developing a new model for the determination of petroleum fraction PC-SAFT parameters to model reservoir fluids
, Article Fluid Phase Equilibria ; Volume 412 , 2016 , Pages 145-157 ; 03783812 (ISSN) ; Assareh, M ; Ghotbi, C ; Sharif University of Technology
Elsevier
Abstract
In this work, PC-SAFT, an equation of state based on perturbation theory, is applied to predict the reservoir fluids phase behavior. PC-SAFT parameters for pure components have previously been assessed, but they cannot be determined for petroleum fractions with unspecified components and composition. In order to remove this difficulty and making use of PC-SAFT model in the reservoir fluids simulations, a new approach is studied which leads to appearing generalized correlations for the estimation of PC-SAFT parameters for petroleum cuts and plus fractions using only their molecular weight and specific gravity, without the essential need for the characterization of petroleum fractions in...
Performance evaluation of a new nanocomposite polymer gel for water shutoff in petroleum reservoirs
, Article Journal of Dispersion Science and Technology ; 2018 ; 01932691 (ISSN) ; Ayatollahi, S ; ZareNezhad, B ; Sharif University of Technology
Taylor and Francis Inc
2018
Abstract
A new polymer gel nanocomposite is fabricated for excess water production control (water shut off) in petroleum reservoirs and its rheological behavior is evaluated in the presence of sea water and formation water at the temperature of 100 °C. It is shown that at a high salinity without using SiO2 nanoparticles, the elastic modulus of synthesized polymer gel in the presence of sea water and formation water are 12.5 Pa and 9.8 Pa respectively. However by incorporation of SiO2 nanoparticles in the polymer gel matrix, the elastic modulus of synthesized polymer gel in the presence of sea water and formation water can be improved to 13.56 Pa and 11.57 Pa respectively, which is quite interesting...
Performance evaluation of a new nanocomposite polymer gel for water shutoff in petroleum reservoirs
, Article Journal of Dispersion Science and Technology ; Volume 40, Issue 10 , 2019 , Pages 1479-1487 ; 01932691 (ISSN) ; Ayatollahi, S ; ZareNezhad, B ; Sharif University of Technology
Taylor and Francis Inc
2019
Abstract
A new polymer gel nanocomposite is fabricated for excess water production control (water shut off) in petroleum reservoirs and its rheological behavior is evaluated in the presence of sea water and formation water at the temperature of 100 °C. It is shown that at a high salinity without using SiO2 nanoparticles, the elastic modulus of synthesized polymer gel in the presence of sea water and formation water are 12.5 Pa and 9.8 Pa respectively. However by incorporation of SiO2 nanoparticles in the polymer gel matrix, the elastic modulus of synthesized polymer gel in the presence of sea water and formation water can be improved to 13.56 Pa and 11.57 Pa respectively, which is quite interesting...
Desulfurization of high sulfur petroleum coke by molten caustic leaching
, Article Egyptian Journal of Petroleum ; Volume 28, Issue 2 , 2019 , Pages 225-231 ; 11100621 (ISSN) ; Khorasheh, F ; Soltanali, S ; Tayyebi, S ; Sharif University of Technology
Egyptian Petroleum Research Institute
2019
Abstract
Desulfurization by molten caustic leaching (MCL) at 400–500 °C has been investigated in order to reduce the sulfur content of petroleum coke. Effective parameters on desulfurization of petroleum coke, other than temperature, include alkali to feed (petroleum coke) mass ratio, time and mesh size in the ranges of 0.5–1.5, 1–3 h and 200–600 µm, respectively. In this work, petroleum coke desulfurization conditions using solid KOH have been studied. Maximum petroleum coke desulfurization by MCL method has been obtained by Taguchi L9 design using alkali to feed mass ratio of 1, temperature of 600 °C, time of 2 h and mesh size of 200 µm. The changes in the main groups on the coke surface have been...
Problems and challenges for implementation of safety and HSE management rules in aged Iranian refineries and petrochemical
, Article 9th International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production 2008 - ""In Search of Sustainable Excellence"", Nice, 15 April 2008 through 17 April 2008 ; Volume 1 , 2008 , Pages 73-75 ; 9781605601663 (ISBN) ; Hashemi, V ; Rashtchian, D ; Sharif University of Technology
2008
Abstract
Nowadays "as everywhere in the world", so much attention is drawn to performing safety and HSE management rules in Iran. Considering the long life of oil and it's relevant industries in Iran (since 1908, first oil well in Middle East, Masjid Soleyman), many units with more than 50 years old are still in operation. This situation posed special problems in performing safety and HSE regulations that some of them are communal among these units. This paper reveals the result of industrial projects, collecting numerous technical checklists in such units and author's experiences in recent years in Iran, which is aimed to announce some of these major problems and also present solutions for them....
Offshore accidents and effects on their performances
, Article Ocean '04 - MTS/IEEE Techno-Ocean '04: Bridges across the Oceans - Conference Proceedings, Kobe, 9 November 2004 through 12 November 2004 ; Volume 1 , 2004 , Pages 212-217 ; 0780386698 (ISBN) ; Hemati, P ; Sharif University of Technology
2004
Abstract
Marine accidents are some of the risk sources on human life at sea and also make the founded budget to be sank to the deep. In order to prevent these damages and losses, it is necessary to do a proper understanding of these accidents. Offshore systems as of the main parts of ocean structures and their accidents are considered here in this paper. From 1975 some data showing offshore accidents are captured in the Worldwide Offshore Accident Databank (WOAD), which are the main data bank to be used in this study. These data are about offshore damages and collapses due to Fires, Blowout, Anchor failure, Capsize, Explosion, etc. The main scope of the study is on fixed offshores, named jackets...
Robust Optimization Model for The Distribution Process of Petroleum Products
, M.Sc. Thesis Sharif University of Technology ; Eshghi, Kourosh (Supervisor)
Abstract
The human need for reliable and accessible energy sources for household, industrial, transportation, etc. caused the discovery of the first oil well to move towards exploitation and use of this large, cheap and available energy source, accelerated. With the start of this movement, oil and its products in the last two centuries have quickly established themselves as a major part of the energy basket of most countries in the world. The entry of crude oil and its products into the energy industry has faced new issues and challenges for decision makers in this field. One of the most important challenges has been the planning and management of the process of distribution and transfer of petroleum...
Experimental and simulation studies of the effect of vertical permeability barriers on oil recovery efficiency during solvent injection processes
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 33, issue. 20 , Nov , 2009 , p. 1889-1900 ; ISSN: 15567036 ; Farzaneh, S. A ; Kharrat, R ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology
Abstract
Almost all of the heavy oil reservoirs contain discontinuous permeability barriers (shales) with different structures. However, the effect of shaly layer geometrical characteristics including: spacing from wells, discontinuity, orientation, shaly layers' spacing and length, and heterogeneous distribution on oil recovery factor in the presence of gravity force are not well understood. In this work, a series of solvent injection experiments were conducted on various vertical one-quarter five-spot glass micromodels, containing barriers, which were initially saturated with a heavy oil sample. The oil recovery was measured by analysis of the pictures provided continuously during the injection...
Utilization of percolation theory to evaluate conductivity of fractured reservoirs - Effect of fracture correlation length on universality
, Article 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 ; Vol. 6, issue , 2010 , p. 4286-4290 ; Masihi, M ; Hashemi, A ; Sharif University of Technology
Abstract
The knowledge of the conductivity across the reservoir that is based on the swept fraction controls the recoverable rates of the hydrocarbon in the secondary displacement processes. Most of the time, we need a fast estimation of the conductivity for decision making during field development. Percolation theory is a very useful tool to get this goal. According to this fact that the results of this method are universal, they could be used widely. In this study connectivity and conductivity percolation models are developed and the universal exponents for connectivity and conductivity in fractured reservoir as well as their dependency on the correlation length are investigated. For L< ξ the...
A statistical inference approach for the identification of dominant parameters in immiscible nitrogen injection
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 36, Issue. 12 , 2014 , Pages 1285-1295 ; ISSN: 15567036 ; Ghazvini, M. G ; Dabir, B ; Emadi, M. A ; Rashtchian, D ; Sharif University of Technology
Abstract
Screening analysis is a useful guideline that helps us with proper field selection for different enhanced oil recovery processes. In this work, reservoir simulation is combined with experimental design to estimate the effect of reservoir rock and fluid properties on performance of immiscible nitrogen injection. Reservoir dip, thickness, and horizontal permeability are found to be the most influential parameters. Possible interactions of parameters are also discussed to increase reliability and robustness of screening results. Finally, significance of both main effects and interactions are evaluated by employing a statistical inference approach (hypothesis testing) and results are compared to...
Development of a new generalized correlation to characterize physical properties of pure components and petroleum fractions
, Article Fluid Phase Equilibria ; Vol. 363 , 15 February , 2014 , pp. 189-198 ; ISSN: 03783812 ; Jamshidi, S ; Sharif University of Technology
Abstract
A new generalized and non-group contribution method has been developed to predict critical temperature (Tc), critical pressure (Pc), critical volume (Vc) and acentric factor (ω) for pure substances and petroleum fractions based on two types of input parameters. This method can take either refractive index and molecular weight or refractive index and normal boiling point as its input. Since refractive index cannot be obtained for an unknown mixture (petroleum fraction), in order to apply the proposed method for petroleum fractions, refractive index is converted to mass density at 293K using the one-third rule. Moreover, the proposed correlation is capable of predicting the properties using...
The simulation of microbial enhanced oil recovery by using a two-layer perceptron neural network
, Article Petroleum Science and Technology ; Vol. 32, Issue. 22 , 2014 , pp. 2700-2707 ; ISSN: 10916466 ; Torkaman, M ; Sedaghat, M. H ; Ghazanfari M.H ; Sharif University of Technology
Abstract
The authors simulated a reservoir by using two-layer perceptron. Indeed a model was developed to simulate the increase in oil recovery caused by bacteria injection into an oil reservoir. This model was affected by reservoir temperature and amount of water injected into the reservoir for enhancing oil recovery. Comparing experimental and simulation results and also the erratic trend of data show that the neural networks have modeled this system properly. Considering the effects of nonlinear factors and their erratic and unknown impacts on recovered oil, the perceptron neural network can develop a proper model for oil recovery factor in various conditions. The neural networks have not been...
Performance of near-miscible simultaneous water and CO2 injection for oil recovery in secondary and tertiary modes
, Article 76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 ; Nov , 2014 , p. 1007-1011 ; Ghazanfari, M. H ; Taghikhani, V ; Sharif University of Technology
Abstract
Simultaneous water and CO2 injection has been performed on a sandstone core to evaluate oil recovery under the secondary and tertiary near-miscible injection modes. It is demonstrated that secondary SWACO2 injection as well as tertiary flood is an effective method for the oil/residual oil recovery from oil saturated/water-flooded porous media. In the secondary SWACO2 injection, the ultimate oil recovery increases by increasing SWAG ratio from 0.2 to 0.4 but due to some limits, e.g. topological effects, prohibiting contacting of injected gas with residual oil in pores, altering SWAG ratio from 0.4 to 0.6 showed no effect on ultimate oil recovery. Secondary SWACO2 injection can recover higher...
Experimental analysis of secondary gas injection strategies
, Article Petroleum Science and Technology ; Volume 31, Issue 8 , 2013 , Pages 797-802 ; 10916466 (ISSN) ; Alizadeh, N ; Kharrat, R ; Ghazanfari, M. H ; Laki, A. S ; Sharif University of Technology
2013
Abstract
CO2 injection is a potentially viable method of enhanced oil recovery for medium oil reservoirs. The authors compare the effect of gas injection strategy (simultaneous water-alternating gas [SWAG], water-alternating gas [WAG], and continuous gas injection [CGI]) on recovery in immiscible, near-miscible, and miscible modes of injection. It has been proved that CGI is not the most efficient injection scenario in oil-wet reservoirs. Miscible and near-miscible core flood tests demonstrated high oil recoveries in all injection strategies due to high capillary numbers achieved as a result of miscibility. The fluid mechanics of floods were discussed using pressure drop data, different mechanics was...
Optimization of coil outlet temperature for producing maximum products in an olefin furnace
, Article Petroleum Science and Technology ; Volume 31, Issue 6 , Feb , 2013 , Pages 596-602 ; 10916466 (ISSN) ; Fakhrhoseini, S. M ; Ghiassi, H ; Sharif University of Technology
2013
Abstract
The bulk of the worldwide annual commercial production of ethylene is based on thermal cracking of petroleum hydrocarbons with steam. In this research, the effect of coil outlet temperature on the reactor yield has been studied. In order to investigate a reliable mathematical correlation, several data points were obtained by adjusting coil outlet temperature in a real plant. In order to investigate best coil outlet temperature, an objective function was represented. Based on the obtained mathematical correlation and the assumed objective function, it was found that best coil outlet temperature for investigating maximum income is 1,128 K
Experimental Investigation on the Effect of Asphaltene Types on the Interfacial Tension of CO2-Hydrocarbon Systems
, Article Energy and Fuels ; Volume 29, Issue 12 , 2015 , Pages 7941-7947 ; 08870624 (ISSN) ; Zebarjad, F. S ; Ayatollahi, S ; Taghikhani, V ; Sharif University of Technology
American Chemical Society
2015
Abstract
Interfacial tension (IFT) is known as the critical parameter affecting the efficiency of CO2 flooding during the enhanced oil recovery (EOR) process. Besides, the asphaltene precipitation phenomenon is reported as the most significant problem during CO2 injection into asphaltenic oil reservoirs. Accordingly, it is important to examine the effect of asphaltene precipitation on the IFT behavior of the oil-CO2 system at reservoir conditions. The main objective of this research work is to study of the effect of asphaltene and its type on the IFT behavior of the oil-CO2 system. The IFT between pure CO2 and a model oil both with and without asphaltene was measured using an axisymmetric drop shape...
Experimental investigation on the effect of asphaltene types on the interfacial tension of co2-hydrocarbon systems
, Article Energy and Fuels ; Volume 29, Issue 12 , November , 2015 , Pages 7941-7947 ; 08870624 (ISSN) ; Zebarjad, F. S ; Ayatollahi, S ; Taghikhani, V ; Sharif University of Technology
American Chemical Society
2015
Abstract
Interfacial tension (IFT) is known as the critical parameter affecting the efficiency of CO2 flooding during the enhanced oil recovery (EOR) process. Besides, the asphaltene precipitation phenomenon is reported as the most significant problem during CO2 injection into asphaltenic oil reservoirs. Accordingly, it is important to examine the effect of asphaltene precipitation on the IFT behavior of the oil-CO2 system at reservoir conditions. The main objective of this research work is to study of the effect of asphaltene and its type on the IFT behavior of the oil-CO2 system. The IFT between pure CO2 and a model oil both with and without asphaltene was measured using an axisymmetric drop shape...
Free fall and controlled gravity drainage processes in fractured porous media: Laboratory and modelling investigation
, Article Canadian Journal of Chemical Engineering ; Volume 93, Issue 12 , October , 2015 , Pages 2286-2297 ; 00084034 (ISSN) ; Ayatollahi, S ; Masihi, M ; Sharif University of Technology
Wiley-Liss Inc
2015
Abstract
Gravity drainage is known to be one of the most effective methods for oil recovery in fractured reservoirs. In this study, both free fall and controlled gravity drainage processes were studied using a transparent fractured experimental model, followed by modelling using commercial CFD software. The governing equations were employed based on the Darcy and mass conservation laws and partial pressure formulation. Comprehensive examination was done on variables such as fluid saturation, velocity, and pressure distribution in the matrix and fracture, as well as fluid front level and production rate. Additionally, effects of the model parameters on the gravity drainage performance were...