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Application of constrained multi-variable search methods for prediction of PVT properties of crude oil systems
, Article Fluid Phase Equilibria ; Vol. 363 , 15 February , 2014 , pp. 121-130 ; ISSN: 03783812 ; Amooie, M. A ; Hemmati-Sarapardeh, A ; Ghazanfari, M. H ; Mohammadi, A. H ; Sharif University of Technology
Abstract
Accurate prediction of the PVT properties of reservoir oil is of primary importance for improved oilfield development strategies. Experimental determination of these properties is expensive and time-consuming. Therefore, new empirical models for universal reservoir oils have been developed as a function of commonly available field data. In this communication, more than 750 experimental data series were gathered from different geographical locations worldwide. Successive linear programming and generalized reduced gradient algorithm as two constrained multivariable search methods were incorporated for modeling and expediting the process of achieving a good feasible solution. Moreover,...
Implementation of SVM framework to estimate PVT properties of reservoir oil
, Article Fluid Phase Equilibria ; Volume 346 , May , 2013 , Pages 25-32 ; 03783812 (ISSN) ; Arabloo, M ; Chamkalani, A ; Amani, M ; Zargari, M. H ; Adelzadeh, M. R ; Sharif University of Technology
2013
Abstract
Through this work, a novel mathematical-based approach was proposed to develop reliable models for calculation of PVT properties of crude oils at various reservoir conditions. For this purpose, a new soft computing approach namely Least Square Support Vector Machine (LSSVM) modeling optimized with Coupled Simulated Annealing (CSA) optimization technique was implemented. The constructed models are evaluated by carrying out extensive experimental data reported in open literature. Results obtained by the proposed models were compared with the corresponding experimental values. Moreover, in-depth comparative studies have been carried out between these models and all other predictive models. The...
Experimental Investigation on the Performance of Preformed Particle Gel in Improving Oil Recovery by Low Salinity Water Injection in Heterogeneous Porous Media
, M.Sc. Thesis Sharif University of Technology ; Ghazanfare, Mohammad Hossein (Supervisor) ; Fatemi, Mobin (Supervisor)
Abstract
Water production from high permeability regions such as fractures and channels in the reservoir can be considered as one of the problematic issues in oil production. In order to control water production, chemical methods such as polymer injection, surfactant injection, and foam injection are widely used, among all of them, Preformed Particle Gel (PPG) is the most efficient method.By injecting the preformed particle gel into the reservoir and blockage of fractures and high permeable regions, Injected water bypasses to the target zone. In this study, preformed gel with a unique formulation was synthesized by free radical polymerization method in the laboratory.Nano-Clay and Nano-Silica were...
Nanotechnology-assisted EOR techniques: New solutions to old challenges
, Article Society of Petroleum Engineers - SPE International Oilfield Nanotechnology Conference 2012 ; 2012 , Pages 382-396 ; 9781622761104 (ISBN) ; Zerafat, M. M ; Sharif University of Technology
SPE
2012
Abstract
Enhanced Oil Recovery techniques are gaining more attention worldwide as the proved oil reserves are declining and the oil price is hiking. Although many giant oil reservoirs in the world were already screened for EOR processes, the main challenges such as low sweep efficiency, costly techniques, possible formation damages, transportation of huge amounts of EOR agents to the fields especially for offshore cases, analyzing micro-scale multi-phase flow in the rock to the large scale tests and the lack of analyzing tools in traditional experimental works, hinder the proposed EOR processes. Our past experiences on using nanotechnology to the upstream cases, especially EOR processes, revealed...
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...