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gas-condensates
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Condensate blockage study in gas condensate reservoir
, Article Journal of Natural Gas Science and Engineering ; Volume 33 , 2016 , Pages 634-643 ; 18755100 (ISSN) ; Bazargan, M ; Darvishi, R ; Mohammadi, A. H ; Sharif University of Technology
Elsevier
2016
Abstract
The effect of condensate blockage on the pressure drop near the well bore has been studied. Two types of single well simulations have been conducted and pressure drop due to condensate blockage has been quantified based on variation of gas relative permeabilities in near well bore area. The relationship of condensate banking pressure drop, gas rate and reservoir quality has been presented. It is shown that for a poor reservoir quality, condensate blockage can increase the pressure drop up to 200% of the pressure drop in the tubing
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) ; 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...
Evolving an accurate model based on machine learning approach for prediction of dew-point pressure in gas condensate reservoirs
, Article Chemical Engineering Research and Design ; Vol. 92, issue. 5 , May , 2014 , p. 891-902 ; ISSN: 02638762 ; Shokrollahi, A ; Arabloo, M ; Mahdikhani-Soleymanloo, R ; Masihi, M ; Sharif University of Technology
Abstract
Over the years, accurate prediction of dew-point pressure of gas condensate has been a vital importance in reservoir evaluation. Although various scientists and researchers have proposed correlations for this purpose since 1942, but most of these models fail to provide the desired accuracy in prediction of dew-point pressure. Therefore, further improvement is still needed. The objective of this study is to present an improved artificial neural network (ANN) method to predict dew-point pressures in gas condensate reservoirs. The model was developed and tested using a total set of 562 experimental data point from different gas condensate fluids covering a wide range of variables. After a...
Development of a new workflow for pseudo-component generation of reservoir fluid detailed analysis: A gas condensate case study
, Article International Journal of Oil, Gas and Coal Technology ; Vol. 7, Issue. 3 , 2014 , pp. 275-297 ; ISSN: 1753-3317 ; Pishvaie, M. R ; Ghotbi, C ; Mittermeir, G. M ; Sharif University of Technology
Abstract
In this work, a new automatic workflow for accurate optimal pseudo-component generation from gas condensate mixtures with a large number of components is presented. This workflow has a good insight into thermo-physical and critical properties and introduces only a small amount of loss of information and EOS flexibility. In this regard, the fuzzy clustering is used to classify the components in the mixture based on the similarities in the critical properties. The mixing rules are then applied to find group properties. Two different approaches for components association in clustering process are investigated with several numbers of groups. The mathematical validity of the groups is controlled...
Production of Zinc Nanoparticles by Electromagnetic Levitation Melting Method
, M.Sc. Thesis Sharif University of Technology ; Halali, Mohammad (Supervisor)
Abstract
In This project high purity Zinc (Zn) Nanoparticles were synthesized using Electromagnetic Levitation Melting Gas Condensation method. In this method the designed coil plays an important role on melting and suspension of the material and our design was costumed specifically for zinc nanoparticles. For each batch of synthesized Zn nanoparticles, 1.5 gr zinc platelet was levitated in the costumed coil and the effect of different parameters on the size and distribution of nanoparticles, was investigated including in- different cooling gas (He, N2 and Argon), gas flow rate, and the pressure inside the chamber. Inert gas was used to cool supersaturated vapor above the molten droplet and eliminate...
The impact of gas compositions on the intensity of positive coupling effect in gas condensate reservoirs
, Article 1st International Petroleum Conference and Exhibition ; 4-6 May , 2009 ; Hashemi, A ; Vaziri, S. M ; Sharif University of Technology
European Association of Geoscientists and Engineers, EAGE
2009
Abstract
The positive coupling effect decreases the condensate saturation as a result of very high flow rates in vicinity of the wellbore. The current work challenges the notion that the positive rate effect does not lead in falling trend of condensate saturation around the wellbore in the case of rich gas composition. According to the results obtained from this parameter case study, four distinct trends would appear in the condensate saturation profile of both lean and rich gas compositions. These quadruplet trends are consistent and their occurrence is mainly related to the considered base capillary number (Ncb) which is likely dependent to the composition of the fluid
Numerical Simulation of Near-well Flow for Gas-condensate Reservoirs and Investigation of the Effect of Various Flow Parameters
, M.Sc. Thesis Sharif University of Technology ; Taghizade Manzari, Mehrdad (Supervisor)
Abstract
This thesis studies a gas condensate reservoir and considers the effect of different parameters. In this group of gas reservoirs, if the pressure drops below the dew point pressure, liquid phase appears. Appearing and disappearing of phases creates four regions in the reservoir. In the region far from the production well, pressure is still above the dew point pressure and vapor phase is present. By approaching production well, pressure drops below the dew point pressure and liquid phase starts to form but it is immobile. In closer regions to the well the liquid phase saturation grows and this phase becomes mobile. As a result, relative permeability of the vapor phase decreases sharply. In...
New modification on production data of gas condensate reservoirs for rate transient analysis
, Article Petroleum Science and Technology ; Vol. 32, issue. 5 , Jan , 2014 , p. 543-554 ; ISSN: 10916466 ; 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 (i.e., Arps, 1945; Fetkovich, 1980) to modern methods that account for the variation of operating conditions at the wellbore. However, the application of these later methods to gas condensate reservoirs is a challenge. The authors aimed to extend the applicability of modern production data analysis (single-phase flow) to analyze the production data of a gas condensate reservoir (two-phase flow). A single-phase production model consists of (a) a material balance equation, (b) the solution of diffusivity equation for gas...
New modification on production data of gas condensate reservoirs for rate transient analysis
, Article Petroleum Science and Technology ; Vol. 32, issue. 5 , 2014 , Pages 543-554 ; ISSN: 10916466 ; 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 (i.e., Arps, 1945; Fetkovich, 1980) to modern methods that account for the variation of operating conditions at the wellbore. However, the application of these later methods to gas condensate reservoirs is a challenge. The authors aimed to extend the applicability of modern production data analysis (single-phase flow) to analyze the production data of a gas condensate reservoir (two-phase flow). A single-phase production model consists of (a) a material balance equation, (b) the solution of diffusivity equation for gas...
Toward a predictive model for estimating dew point pressure in gas condensate systems
, Article Fuel Processing Technology ; Volume 116 , 2013 , Pages 317-324 ; 03783820 (ISSN) ; Shokrollahi, A ; Gharagheizi, F ; Mohammadi, A. H ; Sharif University of Technology
2013
Abstract
Dew-point pressure is one of the most important quantities for characterizing and successful prediction of the future performance of gas condensate reservoirs. The objective of this study is to present a reliable, computer-based predictive model for prediction of dew-point pressure in gas condensate reservoirs. An intelligent approach based on least square support vector machine (LSSVM) modeling was developed for this purpose. To this end, the model was developed and tested using a total set of 562 experimental data points from different retrograde gas condensate fluids covering a wide range of variables. Coupled simulated annealing (CSA) was employed for optimization of hyper-parameters of...
Experimental analysis and characterization of high-purity aluminum nanoparticles (Al-Nps) by electromagnetic levitation gas condensation (ELGC)
, Article Nanomaterials ; Volume 10, Issue 10 , 2020 , Pages 1-15 ; Halali, M ; Javadi, A. A ; Khanjanpour, M. H ; Sharif University of Technology
MDPI AG
2020
Abstract
The production of high-purity aluminum nanoparticles (Al-NPs) is challenging due to the highly reactive nature of Al metals. Electromagnetic levitation gas condensation (ELGC) is a promising method to produce high-purity metallic particles as it avoids the interaction between molten metal and refractory-lined, which guarantees the removal of impurities such as oxygen (O). In this research, high-purity Al-NPs were successfully fabricated via ELGC process and fully characterized. The effects of power input and gas flow rate on particle size and distribution were analyzed using field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and dynamic light...
An experimental phase diagram of a gas condensate reservoir
, Article Petroleum Science and Technology ; Volume 30, Issue 20 , 2012 , Pages 2114-2121 ; 10916466 (ISSN) ; Shadizadeh, S. R ; Sharif University of Technology
2012
Abstract
Most condensate gas reservoirs discovered in Iran are rich in intermediate components. The phase diagram of these fluids is essential for reservoir management. The available commercial reservoir fluid simulators are not able to find the critical point of some of these condensate gas reservoirs to obtain the phase diagram quality lines. The quality lines of these reservoir's samples can be obtained experimentally using the constant mass expansion test data. The authors present experimental development of gas condensate phase diagram along with retrograde condensation and revaporization characterization during the reservoir depletion process of one Iranian condensate gas reservoir
Challenges of fluid phase behavior modeling in Iranian retrograde gas condensate reservoirs
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 37, Issue 6 , Feb , 2015 , Pages 663-669 ; 15567036 (ISSN) ; Asadi, E ; Nasiri, M ; Khajenoori, L ; Masihi, M ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
Production from gas condensate reservoirs requires precise determination of reservoir fluid properties along with their positive impact on real reservoir performance evaluation and fluid in place volume calculation. This fact is particularly important because liquid drop out phenomena occurs as a result of pressure drop due to fluid production and condensate remains in reservoir [Mohebzadeh, 2005. In this study the challenges and problems of fluid phase behavior simulation in southern Iranian retrograde gas condensate reservoirs is discussed. Most of the problems and challenges are inaccuracy of equation of states near the critical point, special conditions and produced fluid flow...
Numerical Simulation of two Phase Flow Around Gas- Condensate Wells With Compositional Model
, M.Sc. Thesis Sharif University of Technology ; Taghizadeh Manzari, Mehrdad (Supervisor) ; Seif, Mohammad Saeid (Supervisor) ; Kazemzade Hannani, Siamak (Supervisor)
Abstract
If the reservoir temperature lies between the critical temperature and cricondentherm of the reservoir fluid, the reservoir is classified as a retrograde gas-condensate reservoir. When the pressure is decreased on these mixtures, instead of expanding or vaporizing as might be expected, they vaporize instead of condensing. If the reservoir pressure is above the upper dew-point pressure, the hydrocarbon system exists as a single phase in the reservoir (region 3). As the reservoir pressure declines isothermally during production from the initial pressure to the upper dew-point pressure, the attraction between the molecules of the light and heavy components move further apart. As this occurs,...
Effect of Carrier Gas Pressure on the Size of Cu Nanoparticles Prepared by ELM Method
, M.Sc. Thesis Sharif University of Technology ; Halali, Mohammad (Supervisor)
Abstract
In this report the important factors affecting the levitation melting of copper are discussed. Pure copper nanoparticles were synthesized by utilizing an Electromagnetic Levitation Melting Gas Condensation (ELM-GC) method. Pure bulk copper samples were melted and evaporated by electromagnetic levitation technique in an inert gas atmosphere in a silica tube. Copper nanoparticles were formed from ascending vapor by employing high purity argon and helium as carrier gases and cooling agents. The pressure of inert gas was changed in both helium and argon atmospheres to investigate on pressure’s effect. Particle size and morphology of the produced nanoparticles were studied by Field Emission...
An analytical delumping methodology for PC-SAFT with application to reservoir fluids
, Article Fluid Phase Equilibria ; Volume 339 , 2013 , Pages 40-51 ; 03783812 (ISSN) ; Ghotbi, C ; Pishvaie, M. R ; Mittermeir, G. M ; Sharif University of Technology
2013
Abstract
The strong bases statistical associated fluid theory (SAFT) equations of state allow modeling for a wide range of scales and applications. The equilibrium calculations are very time-consuming in SAFT-based family of equations of state; therefore the number of components used in describing a fluid mixture must be reduced by grouping. On the other hand, in some applications it is required to retrieve the detailed fluid description from equilibrium calculation performed on the lumped fluid description. The purpose of this paper is to develop a systematic approach for lumping and delumping with equilibrium calculations using the Perturbed Chain (PC)-SAFT equation of state. The methodology...
Pressure and rate transient modeling of multi fractured horizontal wells in shale gas condensate reservoirs
, Article Journal of Petroleum Science and Engineering ; Volume 185 , 2020 ; Taghavinejad, A ; Razghandi, M ; Rahimi Rigi, H ; Moeini, K ; Jamshidi, S ; Sharifi, M ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Gas condensate production using technology of multi-stage hydraulically fracturing in shale gas condensate reservoirs' horizontal wells is a new topic of unconventional resources studies. Thus, shale gas condensate as a new source of energy can be considered as an important issue for development and further studies. In this work, a semi-analytical solution of gas and oil two-phase flow is presented for pressure transient analysis (PTA) and rate transient analysis (RTA) of a shale gas condensate reservoir's production data. Fluid flow assumption here is flow in a pseudo triple-porosity porous media, which are matrix, natural fractures and adsorbed gas. Adsorbed gas is a form of gas in porous...
Analysis of near well-bore behavior of gas condensate reservoir in production stage
, Article Petroleum Science and Technology ; Volume 30, Issue 24 , 2012 , Pages 2594-2603 ; 10916466 (ISSN) ; Aminshahidy, B ; Sanati, A ; Taghikhani, V ; Sharif University of Technology
2012
Abstract
The formation of condensate banking in the near well-bore region will lead to the reduction in gas relative permeability and loss of well deliverability. This loss is investigated by conducting a series of fine grid numerical compositional simulation with the gas condensate and dry gas reservoir data. Also, a method for calculation of condensate blockage skin factor is introduced in which the skin factor is calculated using dry gas and gas condensate simulation production data. The authors also found that absolute permeability and pressure drawdown of the producing well have significant influence on the well gas deliverability and condensate blockage skin factor
Investigation on the importance of the diffusion process during lean gas injection into a simple synthetic depleted naturally fractured gas condensate reservoir
, Article Petroleum Science and Technology ; Volume 30, Issue 7 , Feb , 2012 , Pages 655-671 ; 10916466 (ISSN) ; Gerami, S ; Ghotbi, C ; Hashemi, A ; Sharif University of Technology
2012
Abstract
A depleted naturally fractured gas condensate reservoir with extremely tight matrix permeability in the center of Iran is used for gas storage. Due to the tightness of the matrix, simulation of this process may present a unique challenge in terms of the importance of diffusion process in flow behavior of the injected gas in matrix blocks. This article presents a multimechanistic (Darcian-type flow and Fickian-type flow) mathematical model to investigate the importance of diffusion process as a function of important rock and fluid parameters. The authors' approach consists of the following steps: (a) development of a 1-D governing equations for a single matrix block consists of a gas...
Toward a hydrocarbon-based chemical for wettability alteration of reservoir rocks to gas wetting condition: implications to gas condensate reservoirs
, Article Journal of Molecular Liquids ; Volume 248 , 2017 , Pages 100-111 ; 01677322 (ISSN) ; Ghazanfari, M. H ; Sharif University of Technology
Abstract
Recently, wettability alteration has been much attended by researchers for studying well productivity improvement in gas condensate reservoirs. Previous studies in this area only utilized water/alcohol based chemicals for this purpose. While, hydrocarbon nature of the blocked condensate in retrograde gas reservoirs, may motivate application of hydrocarbon based chemical agents. In this study, a new hydrocarbon based wettability modifier is introduced to alter wettability of carbonate and sandstone rocks to preferentially gas wetting condition. Static and dynamic contact angle measurements, spontaneous imbibition and core flooding tests were conducted to investigate the effect of proposed...