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Efficient back analysis of multiphysics processes of gas hydrate production through artificial intelligence
, Article Fuel ; Volume 323 , 2022 ; 00162361 (ISSN) ; Shadabfar, M ; Huang, H ; Leung, Y. F ; Uchida, S ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Natural gas hydrate, a crystalline solid existing under high-pressure and low-temperature conditions, has been regarded as a potential alternative energy resource. It is globally widespread and occurs mainly inside the pores of deepwater sediments and sediments under permafrost area. Hydrate production via well depressurization is deemed well-suited to existing technology, in which the pore pressure is lowered, the natural gas hydrate is dissociated into water and gas, and the water and gas are produced from well. This method triggers multiphysics processes such as fluid flow, heat transfer, energy adsorption, chemical reaction and sediment deformation, all of which are dependent on the...
Evaluation of the interfacial activity of imidazolium-based ionic liquids and their application in enhanced oil recovery process
, Article Journal of Molecular Liquids ; Volume 362 , 2022 ; 01677322 (ISSN) ; Salehi, M. B ; Mokhtarani, B ; Sharifi, A ; Mirzaei, M ; Taghikhani, V ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Ionic liquids (ILs) are a growing trend in Enhanced Oil Recovery (EOR) studies as alternatives to commercial surfactants due to their environmentally friendly nature, and their resistance in harsh temperatures and salinities. ILs are customizable and come in an immense variety, and therefore, it is vital that different combinations of cation/anion be investigated for use in the industry. In this work, experiments are designed and performed to evaluate novel ILs’ surface activity and performance in a lab-scale EOR set-up, compatible with Iranian oil reservoir conditions. Three imidazolium-based ionic liquids were used, namely, butyl-methylimidazolium nitrate, hexyl-methylimidazolium nitrate,...
Novel experimental evidence on the impact of surface carboxylic acid site density on the role of individual ions in the electrical behavior of crude oil/water
, Article Journal of Molecular Liquids ; Volume 362 , 2022 ; 01677322 (ISSN) ; Mahmoodpour, S ; Ayatollahi, S ; Fatemi, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Perceiving the electrical behavior of the rock/brine and the crude oil/brine interfaces gives insight into the performance of engineered waterflooding. Compared to the rock surface, few studies have attempted to comprehend the complex behavior of the crude-oil surface electrical behavior. To reveal the impact of each ion on the surface charge of crude oil, the zeta potential of crude oil/single-salt brines (including NaCl, CaCl2, MgCl2, Na2SO4, and NaHCO3) was measured in a wide range of salinity. Then, the counterpart interfacial tension (IFT) was measured to determine the capability of each brine in bringing carboxylic acid groups from crude-oil bulk (COOH) to crude oil/brine interface...
Impact of rock morphology on the dominating enhanced oil recovery mechanisms by low salinity water flooding in carbonate rocks
, Article Fuel ; Volume 324 , 2022 ; 00162361 (ISSN) ; Ayatollahi, S ; Fatemi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Because of the complex nature of carbonate reservoirs, the required conditions for effective Low Salinity Water Flooding (LSWF) in these reservoirs need further and in depth investigation. In the present study, three calcite cores, i.e. Cal-1, Cal-2, and IL, with the same chemical composition are subjected to tertiary low salinity water flooding (LSWF), while the crude oil and composition of flooding brine kept the same. The experimental results show significant difference in the amount of enhanced oil recovery, as IL had the most additional oil recovery (20.8 % of IOIP), followed by Cal-2 (10.5 % of IOIP) and Cal-1 (3.9 % of IOIP). The results of contact angle, zeta potential, and effluent...
Effect of brine salinity and hydrolyzed polyacrylamide concentration on the Oil/Brine and Brine/Rock Interactions: Implications on enhanced oil recovery by hybrid low salinity polymer flooding in sandstones
, Article Fuel ; Volume 324 , 2022 ; 00162361 (ISSN) ; Fatemi, M ; Biniaz Delijani, E ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The main idea behind the application of Low salinity polymer flooding (LSPF) enhanced oil recovery (EOR) method is that diluted brine improves the oil recovery by wettability alteration from oil-wet (OW) towards water-wet (WW) condition, while polymer enhances the mobility of the displacing phase. However the possible effect of polymer on the fluid/fluid and fluid/rock interactions are not investigated systematically in the literature. The main objective of the present reserach is to examine the possible effect of hybrid application of low-salinity and polymer on the brine/rock and brine/oil interfaces properties. Formation water (FW) and sea water (SW) and its two different dilutions, i.e....
Very well-covered graphs and local cohomology of their residue rings by the edge ideals
, Article Journal of Algebra ; Volume 606 , 2022 , Pages 1-18 ; 00218693 (ISSN) ; Pournaki, M. R ; Terai, N ; Yassemi, S ; Sharif University of Technology
Academic Press Inc
2022
Abstract
In this paper, we deal with very well-covered graphs. We first describe the structure of these kinds of graphs based on the structure of Cohen–Macaulay very well-covered graphs. As an application, we analyze the structure of local cohomology of the residue rings by the edge ideals of very well-covered graphs. Also, we give different formulas of regularity and depth of these rings from known ones and we finally treat the CMt property. © 2022 Elsevier Inc
Elastodynamic Green’s functions of transversely isotropic n-layer half- and full-spaces subjected to a surface or buried time-harmonic annular loading and associated material degeneracy
, Article Journal of Engineering Mathematics ; Volume 136, Issue 1 , 2022 ; 00220833 (ISSN) ; Shodja, H. M ; Rashidinejad, E ; Sharif University of Technology
Springer Science and Business Media B.V
2022
Abstract
The elastodynamic behavior of layered media consisting of an arbitrary combination of isotropic and transversely isotropic layers is of great importance for many engineering applications. In this work, some appropriate elastodynamic Green’s functions pertinent to both the displacement and the stress fields are devised so that the problems associated with the n-layer semi-infinite and infinite media with any combinations of transversely isotropic and isotropic layers subjected to surface and buried oblique time-harmonic annular loading can all be treated in a unified manner. The material degeneracy arising due to the scenarios where one or more regions are isotropic is also discussed and...
Experimental study and surface complexation modeling of non-monotonic wettability behavior due to change in brine salinity/composition: Insight into anhydrite impurity in carbonates
, Article Journal of Molecular Liquids ; Volume 365 , 2022 ; 01677322 (ISSN) ; Ayatollahi, S ; Pishvaie, M. R ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Wettability alteration as the main mechanism of improved oil recovery in carbonates during low salinity/engineered water flooding (LS/EWF) is a complex phenomenon due to high heterogeneity of rock. During LS/EWF, wettability changes when electrochemical interactions at carbonate-brine interface happen. Anhydrite impurity in carbonates is one of the most important parameters affecting the electrochemical interactions at the rock-brine interface and the wettability alteration process. Therefore, the success of LS/EWF in carbonate reservoirs lies in perceiving the role of impurities such as anhydrite, from a geochemical and dissolution point of view. Modified flotation tests (MFT) were...
simulation of thermo-hydro-mechanical processes at Soultz-sous-Forêts
, Article Energies ; Volume 15, Issue 24 , 2022 ; 19961073 (ISSN) ; Singh, M ; Mahyapour, R ; Tangirala, S. K ; Bär, K ; Sass, I ; Sharif University of Technology
MDPI
2022
Abstract
Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, more economic, and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths, and the resulting porosity–permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection...
Optimization of multilateral well trajectories using pattern search and genetic algorithms
, Article Results in Engineering ; Volume 16 , 2022 ; 25901230 (ISSN) ; Biglarian, H ; Beyrami, H ; Salimi, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Multilateral well is a promising technology in developing oil reservoirs. Because this technology may increase the production rate per well and reduce the costs of field development, it is rapidly replacing the old methods. This study uses a three-dimensional line-source model with direct search methods, including pattern search and genetic algorithms to optimize the well trajectories. This method was applied to several cases, with different forms of wells and reservoirs. In all cases, significant improvement was observed in the production rate. Furthermore, the production enhancement using the optimized well trajectories which have curved-paths is compared to the case with linear well...
New hybrid multi criteria decision making method for offshore windfarm site location in Persian Gulf, Iran
, Article Ocean Engineering ; Volume 256 , 2022 ; 00298018 (ISSN) ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Choosing the right location for the sustainable development of offshore wind energy plays an important role in the success of renewable projects. In this regard, in the present study, a new application of the hybrid Fuzzy-SWARA & Fuzzy-WASPAS method was presented to prioritize the suitable area for developing offshore wind projects. For a case study, five regions with high potential for offshore wind energy in the Persian-Gulf have been investigated. Economic assessment was evaluated using the Levelized Cost of energy method. Evaluation of offshore wind farms has been analyzed from various aspects including technical, economic, social, environmental and risk. The SWARA was used for weighting...
Reduction of formation damage in horizontal wellbores by application of nano-enhanced drilling fluids: Experimental and modeling study
, Article Journal of Petroleum Science and Engineering ; Volume 210 , 2022 ; 09204105 (ISSN) ; Ghazanfari, M. H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
One of the basic challenges during drilling horizontal wellbores is the damage induced by invasion of mud filtrate into the formation. Addition of nanoparticles to drilling fluids has been recognized as a measure of control and reduction of filtrate invasion, which is the primary mechanism of the aforementioned formation damage. Despite notable advances in composing Nano-enhanced drilling fluids, the role of nanoparticle hydrophobicity on performance of the fluids has not been well studied. This study is based on a combined experimental-numerical methodology. In the experimental section, a procedure to find the optimum composition of Nano-enhanced water-based samples, containing...
Minimizing the levelized cost of energy in an offshore wind farm with non-homogeneous turbines through layout optimization
, Article Ocean Engineering ; Volume 249 , 2022 ; 00298018 (ISSN) ; Khorasanchi, M ; Sayyaadi, H ; Sadollah, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Minimum cost of energy is the main goal of a wind farm layout optimization. This is achieved by maximizing the total energy while minimizing the total costs of the farm. In this study, two sizes of commercial turbines were considered to investigate the effect of a non-homogenous farm on the layout optimization process. A cost model consisting of turbines, cable, transformers, foundation, and service vehicle routes was developed. Using Genetic Algorithm and Artificial Neural Network, first the superiority of the new algorithm in turbines and cable layout was verified versus previous studies. Next, two cases were investigated, i.e. (1) a farm populated with identical turbines and (2) a farm...
On the well-posedness, equivalency, and low-complexity translation techniques of discrete-time hybrid automaton and piecewise affine systems
, Article Scientia Iranica ; Volume 29, Issue 2 D , 2022 , Pages 693-726 ; 10263098 (ISSN) ; Mokhtari, H ; Sharif University of Technology
Sharif University of Technology
2022
Abstract
The main contribution of this paper is to present the systematic and low-complexity translation techniques between a class of hybrid systems referred to as automaton-based Discrete-time Hybrid Automata (DHA) and piecewise affine (PWA) systems. As a starting point, the general modeling framework of the automaton-based DHA is represented, which models the controlled and uncontrolled switching phenomena between linear continuous dynamics including discrete and continuous states, inputs and outputs. The basic theoretical definitions on the state trajectories of the proposed DHA with forward and backward evolutions that yield forward and backward piecewise affine (FPWA and BPWA) systems are...
Polyacids for producing colloidally stable amorphous calcium carbonate clusters in water
, Article Journal of Applied Polymer Science ; Volume 139, Issue 14 , 2022 ; 00218995 (ISSN) ; Kayitmazer, A. B ; Ahmad, A ; Ramzan, N ; Li, Y ; Xu, Y ; Sun, S ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
As an important precursor of crystalline phases, amorphous calcium carbonate (ACC), especially ultrasmall ACC clusters, have been attracting great interest in fundamental research, materials chemistry, as well as industrial applications. However, it is still challenging to synthesize stable ACC clusters in water that can be isolated and concentrated without severe aggregation. Herein, we report a facile dialysis method for producing colloidally stable ACC clusters that are well dispersed in water with the protection of specific polycarboxylic acids, which could be also easily deprotected by small-molecule acids like sodium citrate. Inherent proto-calcite short-range order is found to be...
Microfluidics experimental investigation of the mechanisms of enhanced oil recovery by low salinity water flooding in fractured porous media
, Article Fuel ; Volume 314 , 2022 ; 00162361 (ISSN) ; Fatemi, M ; Masihi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Spontaneous imbibition of water from fracture into the matrix is considered as one of the most important recovery mechanisms in the fractured porous media. However, water cannot spontaneously imbibe into the oil-wet rocks and as a result oil won't be produced, unless the capillary pressure barrier between fracture conduits and matrix is overcome. Wettability alteration is known as the main affecting mechanism for low salinity water flooding (LSWF), however, its effectiveness in fractured porous media has been less investigated, especially in the case of possible pore scale displacement mechanisms. In this study, the effectiveness of LSWF (diluted seawater) on oil recovery is compared to the...
Shadow of cyber ostracism over remote environment: Implication on remote work challenges, virtual work environment and employee mental well-being during a Covid-19 pandemic
, Article Acta Psychologica ; Volume 225 , 2022 ; 00016918 (ISSN) ; Murad, M ; Mirza, F ; Chaudhary, N. I ; Saeed, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
This study aimed to identify the influence of workplace cyber ostracism on employee online work engagement and employee mental well-being with the mediating roles of remote work challenges such as loneliness, procrastination, work-home interference, and ineffective communication. As amidst lockdown due to COVID-19, the data was collected from 303 respondents through an online questionnaire that was distributed in virtual groups among friends, relatives, and other fellows who were working in the private sector organizations of Pakistan. The hypotheses were tested using the partial least square structural equation modeling PLS-SEM technique. The findings of this study showed that workplace...
A glimpse to most of the old and new results on very well-covered graphs from the viewpoint of commutative algebra
, Article Research in Mathematical Sciences ; Volume 9, Issue 2 , 2022 ; 25220144 (ISSN) ; Pournaki, M. R ; Seyed Fakhari, S. A ; Terai, N ; Yassemi, S ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
A very well-covered graph is a well-covered graph without isolated vertices such that the height of its edge ideal is half of the number of vertices. In this survey article, we gather together most of the old and new results on the edge and cover ideals of these graphs. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG
Multi model robust control design for a floating offshore variable speed wind turbine with tension leg platform
, Article Ocean Engineering ; Volume 266 , 2022 ; 00298018 (ISSN) ; Sadati, N ; Member, IEEE ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
This paper presents a multi-model robust control (MMRC) design for an offshore variable speed wind turbine with tension leg platform. The proposed control scheme covers the model uncertainty in the above rated wind speed, and it provides a reliable control for power regulation while minimizing the mechanical loads on the wind turbine structure. For this purpose, the above rated wind speed region is divided into several wind speed groups, and a set of linearized models are obtained from the Fatigue, Aerodynamics, Structures, and Turbulence (FAST) simulator for various mean wind speeds of each group. Using Weibull wind speed distribution, a nominal model with additive uncertainty is generated...
A large class of graphs with a small subclass of Cohen–Macaulay members
, Article Communications in Algebra ; Volume 50, Issue 12 , 2022 , Pages 5080-5095 ; 00927872 (ISSN) ; Asir, T ; Pournaki, M. R ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Let R be a finite commutative ring with nonzero identity. The unit graph of R is the graph in which the vertex set is R, and two distinct vertices x and y are adjacent if and only if x + y is a unit in R. In this paper, we determine when these graphs are well-covered, and then, by applying this result, we characterize the unit graphs whose edge rings are Cohen–Macaulay (Gorenstein). This characterization gives us a large class of non-Cohen–Macaulay graphs. © 2022 Taylor & Francis Group, LLC