The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Jill S Buckley - One of the best experts on this subject based on the ideXlab platform.
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SCA2003-01: EFFECT OF CRUDE OIL COMPOSITION ON WETTABILITY OF MICA
2020Co-Authors: Lei Yang, Jianxin Wang, Jill S BuckleyAbstract:While many factors are recognized as influencing reservoir wetting, they do so primarily by controlling the fate of components of the crude oil. Surface mineralogy, brine composition, temperature, pressure, and history of fluid occupation all are important variables, but if the oil does not contain species capable of adsorbing or depositing, reservoir rocks, the majority of which are initially water-wet, would remain in their original water-wet condition, while minerals that are naturally oil-wet would also be unchanged. In this study we focus on specific features of the composition of produced oil samples and relate them to the extent to which these oils alter the wetting of mica surfaces under controlled conditions. Wetting alteration tests were designed to control water film Stability. The extent of wetting alteration was quantified by measurements of probe fluid contact angles. Oil properties were selected on the basis of previous studies that indicated the importance of ionizable species and Asphaltene Stability in the produced oil samples. Statistical tests between single variables and contact angles show little evidence of correlation, but more significant relationships were found using linear multivariate analyses and non-linear artificial neural networks.
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Verification of Asphaltene-InStability-Trend (ASIST) Predictions for Low-Molecular-Weight Alkanes
Spe Production & Operations, 2009Co-Authors: Jefferson L Creek, Jianxin Wang, Jill S BuckleyAbstract:Summary Anticipating when and where Asphaltenes may flocculate during oil production is a key step in successfully preventing or mitigating Asphaltene problems in the field. Because there will be no deposition without precipitation, mapping of Asphaltene Stability over a wide range of temperature, pressure, and composition is required. The ASIST allows the determination of the onset of Asphaltene inStability to be established with a series of liquid n-alkanes. These data are used to predict Asphaltene Stability of live fluids by extrapolating the onset condition from the base data to reservoir conditions by use of a linear extrapolation of the onset solubility parameter vs. square root of the partial molar volume of the precipitant. This extrapolation has been demonstrated previously to be accurate for methane and a model oil. The present work verifies that such an extrapolation is valid for predicting the Asphaltene inStability for mixtures of methane, ethane, and propane with a representative stock-tank oil (STO). The STO was combined with known amounts of methane, ethane, or propane. The Asphaltene onset pressure was determined by a combination of near-infrared (NIR) light scattering and microscopic observation. The onset conditions at ambient pressures were examined for flocculation periods ranging from 20 minutes to 24 hours. Onset pressures calculated with the 5-hour ASIST trends compared well with measured onset pressures.
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development of a general method for modeling Asphaltene Stability
Energy & Fuels, 2009Co-Authors: Francisco M Vargas, Jill S Buckley, Jefferson L Creek, Jianxin Wang, George J. Hirasaki, Doris L Gonzalez, Walter G. ChapmanAbstract:Asphaltenes constitute a potential problem in deep-water production because of their tendency to precipitate and deposit. A universal model to predict the Stability of these species, under different conditions, is desirable to identify potential Asphaltene problems. In our study, we present important advances in developing a general method to model Asphaltene Stability in oil. The perturbed chain-statistical associating fluid theory equation of state (PC-SAFT EoS), which has been previously validated, has been used to generate simulation data for a model oil containing different Asphaltene precipitants. When dimensionless parameters are defined, the equilibrium curves of different multicomponent mixtures collapse onto one single curve. Universal plots for the bubble point and the onset of Asphaltene precipitation have been obtained, which are in excellent agreement with results obtained from simulations. Extension of this model to mixtures containing dissolved gases, such as methane, CO2, and ethane, is a...
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effect of synthetic drilling fluid base oils on Asphaltene Stability and wetting in sandstone cores
Energy & Fuels, 2005Co-Authors: Yongsheng Zhang, Jianxin Wang, And Norman R Morrow, Jill S BuckleyAbstract:Tests of imbibition rates in Berea sandstone cores have been used to examine the wettability effects of displacement of crude oils with a number of synthetic base oils. In all cases examined to date, the products that flocculated Asphaltenes from crude oils also caused water-wet sandstone cores to become markedly less water-wet or even oil-wet. Relatively minor effects on wetting were observed with base oils that did not destabilize Asphaltenes. A simple diagnostic test of Asphaltene Stability can be used to identify specific crude oil/base oil pairs that precipitate Asphaltenes.
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WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS
2003Co-Authors: Jill S Buckley, Norman R. MorrowAbstract:In this report we focus on surface studies of the wetting effects of SBM components; three areas of research are covered. First we present results of tests of interfacial properties of some commercial emulsifiers that are routinely used in both oil-based and synthetic oil-based drilling fluids. These products fall into two main groups, based on their CMC and IFT trends with changing pH. All can alter the wetting of mica, but measurements vary widely depending on the details of exposure and observation protocols. Non-equilibrium effects appear to be responsible for these variations, with equilibrated fluids generally giving lower contact angles than those observed with fluids that have not been pre-equilibrated. Addition of small amounts of emulsifier can increase the tendency of a crude oil to alter wetting of mica surfaces. The effects of similar amounts of these emulsifiers can be detected in interfacial tension measurements. Next, we report on the preliminary results of a study of polyethoxylated amines of varying structures on the wetting of mica surfaces. Contact angles have been measured for unequilibrated and pre-equilibrated fluids. Reduction in contact angles was generally observed when the surfaces were washed with toluene after exposure to surfactant solutions. Atomic forces microscopy is also being used to observe the interactions between these surfactants and mica surfaces. Finally, we show the results of a study of Asphaltene Stability in the presence of synthetic base oils. Most of the base oils in current use are paraffinic or olefinic--the aromatic content is minimized for environmental reasons--and they destabilize Asphaltenes. Tests with two crude oils show onset conditions for base oils that are comparable to n-heptane and n-pentadecane in terms of the solubility conditions at the onset. Two ester-based products, Petrofree and Petrofree LV, did not cause Asphaltene flocculation in these tests. A meeting of the research groups from New Mexico Tech and the University of Wyoming, was held in Laramie on the 9th and 10th of October. All the members of the research teams presented updates on their progress and exchanged views on directions for the remainder of the project.
Jianxin Wang - One of the best experts on this subject based on the ideXlab platform.
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SCA2003-01: EFFECT OF CRUDE OIL COMPOSITION ON WETTABILITY OF MICA
2020Co-Authors: Lei Yang, Jianxin Wang, Jill S BuckleyAbstract:While many factors are recognized as influencing reservoir wetting, they do so primarily by controlling the fate of components of the crude oil. Surface mineralogy, brine composition, temperature, pressure, and history of fluid occupation all are important variables, but if the oil does not contain species capable of adsorbing or depositing, reservoir rocks, the majority of which are initially water-wet, would remain in their original water-wet condition, while minerals that are naturally oil-wet would also be unchanged. In this study we focus on specific features of the composition of produced oil samples and relate them to the extent to which these oils alter the wetting of mica surfaces under controlled conditions. Wetting alteration tests were designed to control water film Stability. The extent of wetting alteration was quantified by measurements of probe fluid contact angles. Oil properties were selected on the basis of previous studies that indicated the importance of ionizable species and Asphaltene Stability in the produced oil samples. Statistical tests between single variables and contact angles show little evidence of correlation, but more significant relationships were found using linear multivariate analyses and non-linear artificial neural networks.
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Verification of Asphaltene-InStability-Trend (ASIST) Predictions for Low-Molecular-Weight Alkanes
Spe Production & Operations, 2009Co-Authors: Jefferson L Creek, Jianxin Wang, Jill S BuckleyAbstract:Summary Anticipating when and where Asphaltenes may flocculate during oil production is a key step in successfully preventing or mitigating Asphaltene problems in the field. Because there will be no deposition without precipitation, mapping of Asphaltene Stability over a wide range of temperature, pressure, and composition is required. The ASIST allows the determination of the onset of Asphaltene inStability to be established with a series of liquid n-alkanes. These data are used to predict Asphaltene Stability of live fluids by extrapolating the onset condition from the base data to reservoir conditions by use of a linear extrapolation of the onset solubility parameter vs. square root of the partial molar volume of the precipitant. This extrapolation has been demonstrated previously to be accurate for methane and a model oil. The present work verifies that such an extrapolation is valid for predicting the Asphaltene inStability for mixtures of methane, ethane, and propane with a representative stock-tank oil (STO). The STO was combined with known amounts of methane, ethane, or propane. The Asphaltene onset pressure was determined by a combination of near-infrared (NIR) light scattering and microscopic observation. The onset conditions at ambient pressures were examined for flocculation periods ranging from 20 minutes to 24 hours. Onset pressures calculated with the 5-hour ASIST trends compared well with measured onset pressures.
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development of a general method for modeling Asphaltene Stability
Energy & Fuels, 2009Co-Authors: Francisco M Vargas, Jill S Buckley, Jefferson L Creek, Jianxin Wang, George J. Hirasaki, Doris L Gonzalez, Walter G. ChapmanAbstract:Asphaltenes constitute a potential problem in deep-water production because of their tendency to precipitate and deposit. A universal model to predict the Stability of these species, under different conditions, is desirable to identify potential Asphaltene problems. In our study, we present important advances in developing a general method to model Asphaltene Stability in oil. The perturbed chain-statistical associating fluid theory equation of state (PC-SAFT EoS), which has been previously validated, has been used to generate simulation data for a model oil containing different Asphaltene precipitants. When dimensionless parameters are defined, the equilibrium curves of different multicomponent mixtures collapse onto one single curve. Universal plots for the bubble point and the onset of Asphaltene precipitation have been obtained, which are in excellent agreement with results obtained from simulations. Extension of this model to mixtures containing dissolved gases, such as methane, CO2, and ethane, is a...
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effect of synthetic drilling fluid base oils on Asphaltene Stability and wetting in sandstone cores
Energy & Fuels, 2005Co-Authors: Yongsheng Zhang, Jianxin Wang, And Norman R Morrow, Jill S BuckleyAbstract:Tests of imbibition rates in Berea sandstone cores have been used to examine the wettability effects of displacement of crude oils with a number of synthetic base oils. In all cases examined to date, the products that flocculated Asphaltenes from crude oils also caused water-wet sandstone cores to become markedly less water-wet or even oil-wet. Relatively minor effects on wetting were observed with base oils that did not destabilize Asphaltenes. A simple diagnostic test of Asphaltene Stability can be used to identify specific crude oil/base oil pairs that precipitate Asphaltenes.
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Asphaltene Stability in crude oil and aromatic solvents the influence of oil composition
Energy & Fuels, 2003Co-Authors: Jianxin Wang, Jill S BuckleyAbstract:Oil composition changes during production, transportation, and processing of crude oils. The effects of compositional changes on Asphaltene Stability have been investigated for different crude oils, fractionated Asphaltenes, and resins with hydrocarbons that act either as Asphaltene solvents or flocculating agents. The refractive index of onset mixtures is used to quantify solution properties with respect to Asphaltene Stability, and the results are compared to predictions of an Asphaltene solubility model. Asphaltene aggregates in depressurized crude oil samples can be explained in terms of natural flocculants in the oil. The effects on Asphaltene Stability of adding aromatic solvents to an oil have been investigated. Mixtures of Asphaltenes and resins show predictable changes in Asphaltene Stability. The results of this study have important implications for Asphaltene Stability testing using dilute oil solutions and can be interpreted without any assumptions about special interactions that are often ass...
Humberto Soscun - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Study of the σ–π and π–π Interactions in Heteroaromatic Monocyclic Molecular Complexes of Benzene, Pyridine, and Thiophene Dimers: Implications on the Resin–Asphaltene Stability in Crude Oil
Energy & Fuels, 2011Co-Authors: Olga Castellano, Raquel Gimon, Humberto SoscunAbstract:Asphaltenes are molecular structures that are composed of polyaromatic and polyheteroaromatic condensed nuclei, where benzene, pyridine, and thiophene rings are the smallest basic structural units. A deep understanding of the electronic features governing the interaction between these primary units is essential for subsequent rationalization of the nature of larger scale inter-and intramolecular interactions between Asphaltenes, which could help to enrich the knowledge of why these compounds tend to aggregate and then to flocculate in oil operation processes. In this work, we study the intermolecular interaction potentials of benzene―benzene, thiophene-thiophene, pyridine―pyridine, benzene―pyridine, benzene―thiophene, and pyridine-thiophene molecular complexes by using the self-consistent generalized gradient approximation density functional theory with the Perdew—Wang 91 functional (DFT/GGA PW91) in conjunction with the DNP double numerical basis set. In order to understand the dominant electronic interaction of these complexes in terms of the σ―π and π―π electronic interactions, the three most important structural conformations (parallel, antiparallel, and T-shaped) were chosen. These calculations were performed with the DMol3Materials Studio 4.0 program. It was found that the results of the interaction energies calculated with DFT/GGA PW91 are consistent with those reported in the literature for benzene and thiophene dimers. To gain insight about the Stability of the studied complexes, their molecular interaction polarizability was evaluated at the PW91PW91/6-31+G(d,p) level of theory. This property allowed us to explain the attraction and repulsion that occur in these dimer formation processes. These statements were also corroborated at the MP2 and MP4 levels of theory for benzene, pyridine, and thiophene homodimer parallel conformations. Additional CCSD/6-31+G(d,p) calculations were performed for the interaction energies of these dimers. To correlate these findings with the Stability of crude oil, a real Asphaltene and resin dimer complex structure was fully optimized at the PW91/DNP level. The results of interaction energy, which is in good agreement with the value predicted in the literature, and the large value of the interaction polarizability allowed us to explain the Stability of these systems.
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theoretical study of the σ π and π π interactions in heteroaromatic monocyclic molecular complexes of benzene pyridine and thiophene dimers implications on the resin Asphaltene Stability in crude oil
Energy & Fuels, 2011Co-Authors: Olga Castellano, Raquel Gimon, Humberto SoscunAbstract:Asphaltenes are molecular structures that are composed of polyaromatic and polyheteroaromatic condensed nuclei, where benzene, pyridine, and thiophene rings are the smallest basic structural units. A deep understanding of the electronic features governing the interaction between these primary units is essential for subsequent rationalization of the nature of larger scale inter-and intramolecular interactions between Asphaltenes, which could help to enrich the knowledge of why these compounds tend to aggregate and then to flocculate in oil operation processes. In this work, we study the intermolecular interaction potentials of benzene―benzene, thiophene-thiophene, pyridine―pyridine, benzene―pyridine, benzene―thiophene, and pyridine-thiophene molecular complexes by using the self-consistent generalized gradient approximation density functional theory with the Perdew—Wang 91 functional (DFT/GGA PW91) in conjunction with the DNP double numerical basis set. In order to understand the dominant electronic interaction of these complexes in terms of the σ―π and π―π electronic interactions, the three most important structural conformations (parallel, antiparallel, and T-shaped) were chosen. These calculations were performed with the DMol3Materials Studio 4.0 program. It was found that the results of the interaction energies calculated with DFT/GGA PW91 are consistent with those reported in the literature for benzene and thiophene dimers. To gain insight about the Stability of the studied complexes, their molecular interaction polarizability was evaluated at the PW91PW91/6-31+G(d,p) level of theory. This property allowed us to explain the attraction and repulsion that occur in these dimer formation processes. These statements were also corroborated at the MP2 and MP4 levels of theory for benzene, pyridine, and thiophene homodimer parallel conformations. Additional CCSD/6-31+G(d,p) calculations were performed for the interaction energies of these dimers. To correlate these findings with the Stability of crude oil, a real Asphaltene and resin dimer complex structure was fully optimized at the PW91/DNP level. The results of interaction energy, which is in good agreement with the value predicted in the literature, and the large value of the interaction polarizability allowed us to explain the Stability of these systems.
Francisco M Vargas - One of the best experts on this subject based on the ideXlab platform.
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characterizing Asphaltene deposition in the presence of chemical dispersants in porous media micromodels
Energy & Fuels, 2017Co-Authors: Peng He, Nevin Thunduvila Mathew, Yap Yit Fatt, J C Chai, Francisco M Vargas, Afshin Goharzadeh, Mohammad Tavakkoli, Sibani Lisa BiswalAbstract:Asphaltenes are components in crude oil known to deposit and interrupt flows in critical regions during oil production, such as the wellbore and transportation pipelines. Chemical dispersants are commonly used to disperse Asphaltenes into smaller agglomerates or increase Asphaltene Stability in solution with the goal of preventing deposition. However, in many cases, these chemical dispersants fail in the field or even worsen the deposition problems in the wellbores. Further understanding of the mechanisms by which dispersants alter Asphaltene deposition under dynamic flowing conditions is needed to better understand flow assurance problems. Here, we describe the use of porous media microfluidic devices to evaluate how chemical dispersants change Asphaltene deposition. Four commercially used alkylphenol model chemical dispersants are tested with model oils flowing through porous media, and the resulting deposition kinetics are visualized at both the matrix scale and pore scale. Interestingly, initial Asphaltene deposition worsens in the presence of the tested dispersants, but the mechanism by which plugging and permeability reduction in the porous media varies. The velocity profiles near the deposit are analyzed to further investigate how shear forces affect Asphaltene deposition. The deposition tendency is also related to the intermolecular interactions governing the Asphaltene–dispersant systems. Furthermore, the model system is extended to a real case. The use of porous media microfluidic devices offers a unique platform to develop and design effective chemical dispersants for flow assurance problems.
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Effect of Emulsified Water on Asphaltene InStability in Crude Oils
Energy & Fuels, 2016Co-Authors: Mohammad Tavakkoli, Andrew Chen, Chi-an Sung, Kelly M. Kidder, Saeed M. Alhassan, Francisco M VargasAbstract:Understanding Asphaltene precipitation and subsequent deposition during oil production is of great importance for the oil industry nowadays because of the potential risk associated with this heavy fraction in plugging wellbores and production equipment. Although water is commonly present in the produced fluids, because of instrument limitations and inadequate techniques, it is usually separated from the oil prior to any experimental analysis. Therefore, the effect of water on Asphaltene Stability and deposition tendency is not completely understood, and the information available in the literature is scarce. In this work, the effect of emulsified water on Asphaltene inStability in crude oil systems is investigated. Three crude oils and one bitumen sample were used in this study. The crude oils had American Petroleum Institute (API) gravities ranging from 26° to 40° and Asphaltene content between 1.2 and 13 wt %. Model oils were also prepared with Asphaltenes extracted from these crude oils. A total of nine...
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Asphaltene deposition in different depositing environments part 1 model oil
Energy & Fuels, 2014Co-Authors: Mohammad Tavakkoli, Sai R Panuganti, Francisco M Vargas, Vahid Taghikhani, Mahmoud Reza Pishvaie, Walter G. ChapmanAbstract:Among the Asphaltene flow assurance issues, the most major concern because of Asphaltene is its potential to deposit in reservoir, well tubing, flow lines, separators, and other systems along production lines causing significant production losses. Hence, the focus of this study is to understand the depositional tendency of Asphaltene using quartz crystal microbalance with dissipation (QCM–D) measurements. The results are presented in two consecutive papers, with this paper (part 1) dealing with model oil systems. The depositing environment is varied by changing the system temperature, Asphaltene polydispersity, solvent (Asphaltene Stability), depositing surface, and flow rate. This paper also discusses the roles of convective, diffusive, and adsorption kinetics on Asphaltene deposition by modeling the adsorbed mass before Asphaltene precipitation onset. The successive paper (part 2; 10.1021/ef401868d) will deal with real crude oil systems and modeling of the deposited mass after Asphaltene precipitation o...
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Asphaltene Stability prediction based on dead oil properties experimental evaluation
Energy & Fuels, 2012Co-Authors: Doris L Gonzalez, Francisco M Vargas, Elham Mahmoodaghdam, Nikhil JoshiAbstract:The Asphaltene content effect on crude oil properties was investigated for a series of deepwater Gulf of Mexico (GOM) fluids with Asphaltene contents varying from 4 to 15 wt %. The objective of the study was to conduct flow assurance screening tests on GOM samples collected from different sands and determine properties of the dead oil and the Asphaltene Stability. Densities, refractive indices, and viscosities were measured at different temperatures in dead oils with three different Asphaltene contents. The properties showed defined tendencies with the Asphaltene content and with the temperature. The application of the one-third rule in the calculation of properties, such as solubility parameter and viscosity of dead oil systems, was evaluated. This approach also provides an alternative to calculate the refractive index based on densities obtained from an equation of state. The analysis also shows the important role that the Asphaltene content plays in determining the viscosity of crude oil and evaluates ...
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development of a general method for modeling Asphaltene Stability
Energy & Fuels, 2009Co-Authors: Francisco M Vargas, Jill S Buckley, Jefferson L Creek, Jianxin Wang, George J. Hirasaki, Doris L Gonzalez, Walter G. ChapmanAbstract:Asphaltenes constitute a potential problem in deep-water production because of their tendency to precipitate and deposit. A universal model to predict the Stability of these species, under different conditions, is desirable to identify potential Asphaltene problems. In our study, we present important advances in developing a general method to model Asphaltene Stability in oil. The perturbed chain-statistical associating fluid theory equation of state (PC-SAFT EoS), which has been previously validated, has been used to generate simulation data for a model oil containing different Asphaltene precipitants. When dimensionless parameters are defined, the equilibrium curves of different multicomponent mixtures collapse onto one single curve. Universal plots for the bubble point and the onset of Asphaltene precipitation have been obtained, which are in excellent agreement with results obtained from simulations. Extension of this model to mixtures containing dissolved gases, such as methane, CO2, and ethane, is a...
Olga Castellano - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Study of the σ–π and π–π Interactions in Heteroaromatic Monocyclic Molecular Complexes of Benzene, Pyridine, and Thiophene Dimers: Implications on the Resin–Asphaltene Stability in Crude Oil
Energy & Fuels, 2011Co-Authors: Olga Castellano, Raquel Gimon, Humberto SoscunAbstract:Asphaltenes are molecular structures that are composed of polyaromatic and polyheteroaromatic condensed nuclei, where benzene, pyridine, and thiophene rings are the smallest basic structural units. A deep understanding of the electronic features governing the interaction between these primary units is essential for subsequent rationalization of the nature of larger scale inter-and intramolecular interactions between Asphaltenes, which could help to enrich the knowledge of why these compounds tend to aggregate and then to flocculate in oil operation processes. In this work, we study the intermolecular interaction potentials of benzene―benzene, thiophene-thiophene, pyridine―pyridine, benzene―pyridine, benzene―thiophene, and pyridine-thiophene molecular complexes by using the self-consistent generalized gradient approximation density functional theory with the Perdew—Wang 91 functional (DFT/GGA PW91) in conjunction with the DNP double numerical basis set. In order to understand the dominant electronic interaction of these complexes in terms of the σ―π and π―π electronic interactions, the three most important structural conformations (parallel, antiparallel, and T-shaped) were chosen. These calculations were performed with the DMol3Materials Studio 4.0 program. It was found that the results of the interaction energies calculated with DFT/GGA PW91 are consistent with those reported in the literature for benzene and thiophene dimers. To gain insight about the Stability of the studied complexes, their molecular interaction polarizability was evaluated at the PW91PW91/6-31+G(d,p) level of theory. This property allowed us to explain the attraction and repulsion that occur in these dimer formation processes. These statements were also corroborated at the MP2 and MP4 levels of theory for benzene, pyridine, and thiophene homodimer parallel conformations. Additional CCSD/6-31+G(d,p) calculations were performed for the interaction energies of these dimers. To correlate these findings with the Stability of crude oil, a real Asphaltene and resin dimer complex structure was fully optimized at the PW91/DNP level. The results of interaction energy, which is in good agreement with the value predicted in the literature, and the large value of the interaction polarizability allowed us to explain the Stability of these systems.
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theoretical study of the σ π and π π interactions in heteroaromatic monocyclic molecular complexes of benzene pyridine and thiophene dimers implications on the resin Asphaltene Stability in crude oil
Energy & Fuels, 2011Co-Authors: Olga Castellano, Raquel Gimon, Humberto SoscunAbstract:Asphaltenes are molecular structures that are composed of polyaromatic and polyheteroaromatic condensed nuclei, where benzene, pyridine, and thiophene rings are the smallest basic structural units. A deep understanding of the electronic features governing the interaction between these primary units is essential for subsequent rationalization of the nature of larger scale inter-and intramolecular interactions between Asphaltenes, which could help to enrich the knowledge of why these compounds tend to aggregate and then to flocculate in oil operation processes. In this work, we study the intermolecular interaction potentials of benzene―benzene, thiophene-thiophene, pyridine―pyridine, benzene―pyridine, benzene―thiophene, and pyridine-thiophene molecular complexes by using the self-consistent generalized gradient approximation density functional theory with the Perdew—Wang 91 functional (DFT/GGA PW91) in conjunction with the DNP double numerical basis set. In order to understand the dominant electronic interaction of these complexes in terms of the σ―π and π―π electronic interactions, the three most important structural conformations (parallel, antiparallel, and T-shaped) were chosen. These calculations were performed with the DMol3Materials Studio 4.0 program. It was found that the results of the interaction energies calculated with DFT/GGA PW91 are consistent with those reported in the literature for benzene and thiophene dimers. To gain insight about the Stability of the studied complexes, their molecular interaction polarizability was evaluated at the PW91PW91/6-31+G(d,p) level of theory. This property allowed us to explain the attraction and repulsion that occur in these dimer formation processes. These statements were also corroborated at the MP2 and MP4 levels of theory for benzene, pyridine, and thiophene homodimer parallel conformations. Additional CCSD/6-31+G(d,p) calculations were performed for the interaction energies of these dimers. To correlate these findings with the Stability of crude oil, a real Asphaltene and resin dimer complex structure was fully optimized at the PW91/DNP level. The results of interaction energy, which is in good agreement with the value predicted in the literature, and the large value of the interaction polarizability allowed us to explain the Stability of these systems.