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Solid acid catalytic alkylation: A means for gasoline-aromatics reduction
, Article Proceedings of the 17th World Petroleum Congress, Rio de Janeiro, 1 September 2002 through 5 September 2002 ; Volume 3 , 2002 , Pages 405-416 ; Kazemeini, M ; Khorasheh, F ; Sahebdelfar, S ; Sharif University of Technology
2002
Abstract
Reduction of aromatics implies that the gasoline pool would suffer both quantitatively and qualitatively. Alkylates (highly branched paraffinic hydrocarbons) are ideal substitutes because of their high octane numbers, and environmental friendly characters. Alkylates have played significant roles in US gasoline pool, while in Europe alkylates have a lesser important role. The phase out of lead and the increased capacity of FCC units for making more gasoline from heavier petroleum cuts have enhanced the validity of alkylation processes in petroleum refineries. Based on the data obtained in the laboratory using a new developed catalyst, it is predicted to behave as a successful catalyst for C4...
QCM Investigation of Different Depositing Factors Effects on the Asphaltene Deposition
, M.Sc. Thesis Sharif University of Technology ; Ghazanfari, Mohammad Hossein (Supervisor) ; Taghikhani, Vahid (Supervisor)
Abstract
Asphaltene deposition, the heaviest and most polar component of crude oil, which causes great economic damage inside the reservoir, near wells, pipelines and well equipment, is an important challenge in the production of oil reservoirs. The main purpose of this study is to prob the adsorption kinetics and the mechanism of asphaltene adsorption on the metal surface by a quartz crystal microbalance device under different conditions of temperature, flow rate and degree of asphaltene instability. In this study, indirect uv-vis spectroscopic method was used to determine the onset of asphaltene precipitation, then experiments were designed using Taguchi method. A new QCM device has been designed...
Modeling of Asphaltene Transport and Deposition under the Effect of Flow Regime in Production oil well
, M.Sc. Thesis Sharif University of Technology ; Taghikhani, Vahid (Supervisor) ; Ayatollahi, Shahab (Co-Supervisor)
Abstract
Asphaltene deposition, considered as the heaviest and the most polarizable fraction of crude oil, can cause severe problems in oil production and extraction systems. Oil production companies annually bear huge reduction or even cessation in production and, in turn, costs due to asphaltene precipitation and deposition in wellbore or production tubings. To gain more and better insight into asphaltene formation in production systems, the conceptual investigation on the mechanisms of asphaltene adsorption and deposition on a solid surface is indispensable. In this study Asphaltene's particle adsorption and deposition onto the metal surface under the effect of flow is investigated by experimental...
SAFT model for upstream asphaltene applications
, Article Fluid Phase Equilibria ; Volume 359 , December , 2013 , Pages 2-16 ; 03783812 (ISSN) ; Tavakkoli, M ; Vargas, F. M ; Gonzalez, D. L ; Chapman, W. G ; Sharif University of Technology
2013
Abstract
The increasing incidence of flow assurance problems caused by asphaltene deposition during oil production has motivated the development of numerous theoretical models and experimental methods to analyze this complex phenomenon. Even more challenging are the prediction of the occurrence and the magnitude of asphaltene deposition. It is well accepted that precipitation of asphaltene is a necessary condition for deposition. Hence, a significant amount of work has been devoted to the understanding of the conditions at which asphaltene precipitate from the crude oil. Although, several models seem to work well for correlating available data of onsets of asphaltene precipitation, they usually lack...
Simulation of Asphaltene Slurry Flow for Oil Dominant Systems in Vertical Wells
,
Ph.D. Dissertation
Sharif University of Technology
;
Taghikhani, Vahid
(Supervisor)
;
Pishvaie, Mahmoud Reza
(Supervisor)
;
Masihi, Mohsen
(Co-Advisor)
;
Chapman, Walter
(Co-Advisor)
;
Panuganti, Sai
(Co-Advisor)
Abstract
In the upstream asphaltene flow assurance community, both academics and industries are actively involved to predict the asphaltene deposit profile in wellbores and pipelines. The main objective of this study is to contribute to the thermodynamic and transport modeling of asphaltene in order to predict its precipitation, aggregation and deposition. For a better knowledge of the flow properties of asphaltene containing crude oils, it is necessary to understand how asphaltene affect the rheological properties. In this work, the information on such rheological properties of oil-asphaltene slurry systems is provided. The results of rheological experiments for two Iranian crude oils show that the...
An integrated approach for predicting asphaltenes precipitation and deposition along wellbores
, Article Journal of Petroleum Science and Engineering ; Volume 203 , 2021 ; 09204105 (ISSN) ; Husein, M. M ; Ghotbi, C ; Taghikhani, V ; Dabir, B ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Deposition of asphaltenes upon precipitation is a main flow assurance concern, which propelled the development of various experimental and modeling techniques to accurately predict its occurrence. This work develops an integrated approach combining thermodynamic and deposition modules with a multiphase flow simulator to simultaneously model asphaltenes precipitation and deposition in wellbores. The Peng-Robinson equation of state and the modified Miller-Flory-Huggins theory are used to calculate the thermodynamic properties of the oil and asphaltenes precipitation, respectively. The deposition module is based on conservation laws for asphaltenes transport and is linked to the flow simulator...
Applications of the quartz crystal microbalance in energy and environmental sciences: From flow assurance to nanotechnology
, Article Fuel ; Volume 313 , 2022 ; 00162361 (ISSN) ; Rostaminikoo, E ; Joonaki, E ; Mirzaalian Dastjerdi, A ; Najafi, B ; Taghikhani, V ; Hassanpouryouzband, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
In the last decade, there has been a swift development in several scientific research works in which the quartz crystal microbalance (QCM) technique has played a critical role in unravelling different aspects of energy and environmental materials and biological substances as well as all corresponding molecular interactions within those media. We comprehensively review the numerous types of surface chemistries, including but not limited to hydrogen bonding, hydrophobic and electrostatic interactions, self-assembled monolayers and ionic bonding, that are monitored using QCMs in a variety of fields such as energy and chemical industries in addition to the biology, medicine and nanotechnology...
A wet cold-flow technology for tackling offshore flow-assurance problems
, Article SPE Projects, Facilities and Construction ; Volume 5, Issue 2 , 2010 , Pages 58-64 ; 19422431 (ISSN) ; Chapoy, A ; Anderson, R ; Tohidi, B ; Sharif University of Technology
2010
Abstract
Flow assurance is a major challenge in offshore and deepwater operations. Conventional approaches for preventing gas-hydrate formation involve using thermodynamic inhibitors (e.g., methanol, glycol) or kinetic hydrate inhibitors or operating outside the hydratestability zone by insulating the pipeline and/or active heating. These techniques are not always economical and in some cases are not practical for deepwater operations, long tiebacks, or aging reservoirs with high water cuts. The industry needs new and novel flow-assurance techniques to address these challenging conditions. The approach presented in this paper is a wet cold-flow-based method in which gas-hydrate management rather than...
A new multiphase and dynamic asphaltene deposition tool (MAD-ADEPT) to predict the deposition of asphaltene particles on tubing wall
, Article Journal of Petroleum Science and Engineering ; Volume 195 , 2020 ; Jamshidi, S ; Taghikhani, V ; Sharif University of Technology
Elsevier B.V
2020
Abstract
As expounded, the precipitation and deposition of asphaltene particles in pipelines has been proved to be the most challenging flow assurance problem due to its unknown and complex behaviors. In this work, a new multicomponent, multiphase and dynamic tool was developed to model the aggregation and deposition of asphaltene particles in a bulk medium. The multiphase and dynamic asphaltene deposition tool, shortened as MAD-ADEPT is, in fact, a modified version of the previously developed ADEPT. The new tool was developed to make the asphaltene deposition and aggregation concepts in oil production wells more predictable. To tackle the complexity of the asphaltene problem, a bespoke algorithm was...