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Mohammad Hossein Ghazanfari - One of the best experts on this subject based on the ideXlab platform.
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the impact of silica nanoparticles on the performance of Polymer solution in presence of salts in Polymer Flooding for heavy oil recovery
Fuel, 2014Co-Authors: Ali Maghzi, Ali Mohebbi, Riyaz Kharra, Mohammad Hossein GhazanfariAbstract:Abstract Due to role of Polymer in increasing sweep efficiency during oil recovery, much attention has been paid to the using Polymer solutions in enhanced oil recovery methods. In spite of the existence of the great researches in this area, the role of nanoparticles in modification of the Polymer performance in the presence of salts has not been examined before. Furthermore, there is no information about how the dispersed silica nanoparticles affect the heavy oil recovery during the Polymer Flooding in the presence of divalent cations. In this study, a series of Polymer Flooding experiments are performed in a quarter five-spot glass micromodel saturated with heavy oil. Solutions of polyacrylamide and dispersed silica nanoparticles in polyacrylamide (DSNP) with different salinities are used as the injectants to examine the effect of silica nanoparticles on the polyacrylamide performance in the presence of salts during Polymer Flooding of heavy oil, the oil recovery values were measured in different salinities. Furthermore, viscosity measurements are performed to help analyzing the results of Polymer Flooding tests. The oil recovery is measured via analysis of the continuously captured images during the displacement. Also, microscopic monitoring is used to analyze the distribution of residual heavy oil and Polymer solution at the pore level. The results showed that the oil recovery decreases by increasing the salt concentration during the polyacrylamide Flooding whereas in case of Flooding with suspension of silica nanoparticles in polyacrylamide, decreasing rate in oil recovery is lower. The results of viscosity measurements showed that increasing the salt concentration lowers the viscosity of polyacrylamide solution to a minimum value which at higher values salts had a reverse effect and increased solution viscosity. Moreover, viscosity of silica nanosuspension in polyacrylamide was higher than that of polyacrylamide solution at the same salinity. This increase in viscosity becomes more noticeable by increasing the silica nanoparticles concentration. Finally oil recovery values versus injectant viscosity were plotted for different condition of salinity which confirmed the previous results, it means oil recovery was increased wherever injectant viscosity has been increased.
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characterizing the role of shale geometry and connate water saturation on performance of Polymer Flooding in heavy oil reservoirs experimental observations and numerical simulations
Transport in Porous Media, 2012Co-Authors: Saber Mohammadi, Mohsen Masihi, Mohammad Hossein GhazanfariAbstract:Many heavy oil reservoirs contain discontinuous shales which act as barriers or baffles to flow. However, there is a lack of fundamental understanding about how the shale geometrical characteristics affect the reservoir performance, especially during Polymer Flooding of heavy oils. In this study, a series of Polymer injection processes have been performed on five-spot glass micromodels with different shale geometrical characteristics that are initially saturated with the heavy oil. The available geological characteristics from one of the Iranian oilfields were considered for the construction of the flow patterns by using a controlled-laser technology. Oil recoveries as a function of pore volumes of injected fluid were determined from analysis of continuously recorded images during the experiments. We observed a clear bypassing of displacing fluid which results in premature breakthrough of injected fluid due to the shale streaks. Moreover, the results showed a decrease of oil recovery when shales’ orientation, length, spacing, distance of the shale from production well, and density of shales increased. In contrast, an increase of shale discontinuity or distance of the shale streak from the injection well increased oil recovery. The obtained experimental data have also been used for developing and validating a numerical model where good matching performance has been observed between our experimental observations and simulation results. Finally, the role of connate water saturation during Polymer Flooding in systems containing flow barriers has been illustrated using pore level visualizations. The microscopic observations confirmed that besides the effect of shale streaks as heterogeneity in porous medium, when connate water is present, the trapped water demonstrates another source of disturbance and causes additional perturbations to the displacement interface leading to more irregular fingering patterns especially behind the shale streaks and also causes a reduction of ultimate oil recovery. This study reveals the application of glass micromodel experiments for studying the effects of barriers on oil recovery and flow patterns during EOR processes and also may provide a set of benchmark data for recovery of oil by immiscible Polymer flood around discontinuous shales.
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Pore-Scale Monitoring of Wettability Alteration by Silica Nanoparticles During Polymer Flooding to Heavy Oil in a Five-Spot Glass Micromodel
Transport in Porous Media, 2011Co-Authors: Ali Maghzi, Riyaz Kharrat, Ali Mohebbi, Mohammad Hossein GhazanfariAbstract:It is well known that the oil recovery is affected by wettability of porous medium; however, the role of nanoparticles on wettability alteration of medium surfaces has remained a topic of debate in the literature. Furthermore, there is a little information of the way dispersed silica nanoparticles affect the oil recovery efficiency during Polymer Flooding, especially, when heavy oil is used. In this study, a series of injection experiments were performed in a five-spot glass micromodel after saturation with the heavy oil. Polyacrylamide solution and dispersed silica nanoparticles in polyacrylamide (DSNP) solution were used as injected fluids. The oil recovery as well as fluid distribution in the pores and throats was measured with analysis of continuously provided pictures during the experiments. Sessile drop method was used for measuring the contact angles of the glass surface at different states of wettability after coating by heavy oil, distilled water, dispersed silica nanoparticles in water (DSNW), polyacrylamide solution, and DSNP solution. The results showed that the silica nanoparticles caused enhanced oil recovery during Polymer Flooding by a factor of 10%. The distribution of DSNP solution during Flooding tests in pores and throats showed strong water-wetting of the medium after Flooding with this solution. The results of sessile drop experiments showed that coating with heavy oil, could make an oil-wet surface. Coating with distilled water and Polymer solution could partially alter the wettability of surface to water-wet and coating with DSNW and DSNP could make a strongly water-wet surface.
Ali Mohebbi - One of the best experts on this subject based on the ideXlab platform.
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using surface modified clay nanoparticles to improve rheological behavior of hydrolized polyacrylamid hpam solution for enhanced oil recovery with Polymer Flooding
Journal of Molecular Liquids, 2016Co-Authors: Arezoo Rezaei, Ali Mohebbi, Mehdi Abdikhangah, Afshin Tatar, Amir H MohammadiAbstract:Abstract In this communication, effect of Surface Modified Clay Nanoparticles (SMCN) on rheological behavior of Hydrolized Polyacrylamid (HPAM) solution and also its resistance against the increases in temperature and salinity were investigated experimentally. An increases in Polymer solution viscosity result in a decrease in mobility ratio then consequently it may increase the Polymer Flooding efficiency. High pressures imposed on Polymers during Flooding processes cause a considerable shear stress on them, which lead to breakage of Polymer chains. In addition, at elevated temperatures, certain chemical reactions are accelerated and subsequently this force Polymer chains to compress. This kind of behavior (compactness of Polymer chains) can be observed in a saline environment. Therefore, Polymer viscosity and consequent Flooding process efficiency is decreased. To prevent deformation of Polymers and increase the internal friction of the solution, surface of certain clay nanoparticles were modified by specific tetrahedral redundants and located between Polymer chains. Finally, the potential utilization of these novel clay nanoparticles in improving the performance of Polymer Flooding on an unconsolidated sandpacks were investigated. According to the results, we suggest 0.1% wt concentration of SMCN as the optimum concentration in which the SMCN-HPAM solution is stable. In addition, results indicate that adding SMCN improves the resistance of Polymer solution against an increases in salinity and temperature, and also its shear thinning behavior. Moreover, the experimental result indicates that SMCN-HPAM increases the oil recovery about 33% more than ordinary Polymer Flooding processes.
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the impact of silica nanoparticles on the performance of Polymer solution in presence of salts in Polymer Flooding for heavy oil recovery
Fuel, 2014Co-Authors: Ali Maghzi, Ali Mohebbi, Riyaz Kharra, Mohammad Hossein GhazanfariAbstract:Abstract Due to role of Polymer in increasing sweep efficiency during oil recovery, much attention has been paid to the using Polymer solutions in enhanced oil recovery methods. In spite of the existence of the great researches in this area, the role of nanoparticles in modification of the Polymer performance in the presence of salts has not been examined before. Furthermore, there is no information about how the dispersed silica nanoparticles affect the heavy oil recovery during the Polymer Flooding in the presence of divalent cations. In this study, a series of Polymer Flooding experiments are performed in a quarter five-spot glass micromodel saturated with heavy oil. Solutions of polyacrylamide and dispersed silica nanoparticles in polyacrylamide (DSNP) with different salinities are used as the injectants to examine the effect of silica nanoparticles on the polyacrylamide performance in the presence of salts during Polymer Flooding of heavy oil, the oil recovery values were measured in different salinities. Furthermore, viscosity measurements are performed to help analyzing the results of Polymer Flooding tests. The oil recovery is measured via analysis of the continuously captured images during the displacement. Also, microscopic monitoring is used to analyze the distribution of residual heavy oil and Polymer solution at the pore level. The results showed that the oil recovery decreases by increasing the salt concentration during the polyacrylamide Flooding whereas in case of Flooding with suspension of silica nanoparticles in polyacrylamide, decreasing rate in oil recovery is lower. The results of viscosity measurements showed that increasing the salt concentration lowers the viscosity of polyacrylamide solution to a minimum value which at higher values salts had a reverse effect and increased solution viscosity. Moreover, viscosity of silica nanosuspension in polyacrylamide was higher than that of polyacrylamide solution at the same salinity. This increase in viscosity becomes more noticeable by increasing the silica nanoparticles concentration. Finally oil recovery values versus injectant viscosity were plotted for different condition of salinity which confirmed the previous results, it means oil recovery was increased wherever injectant viscosity has been increased.
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Pore-Scale Monitoring of Wettability Alteration by Silica Nanoparticles During Polymer Flooding to Heavy Oil in a Five-Spot Glass Micromodel
Transport in Porous Media, 2011Co-Authors: Ali Maghzi, Riyaz Kharrat, Ali Mohebbi, Mohammad Hossein GhazanfariAbstract:It is well known that the oil recovery is affected by wettability of porous medium; however, the role of nanoparticles on wettability alteration of medium surfaces has remained a topic of debate in the literature. Furthermore, there is a little information of the way dispersed silica nanoparticles affect the oil recovery efficiency during Polymer Flooding, especially, when heavy oil is used. In this study, a series of injection experiments were performed in a five-spot glass micromodel after saturation with the heavy oil. Polyacrylamide solution and dispersed silica nanoparticles in polyacrylamide (DSNP) solution were used as injected fluids. The oil recovery as well as fluid distribution in the pores and throats was measured with analysis of continuously provided pictures during the experiments. Sessile drop method was used for measuring the contact angles of the glass surface at different states of wettability after coating by heavy oil, distilled water, dispersed silica nanoparticles in water (DSNW), polyacrylamide solution, and DSNP solution. The results showed that the silica nanoparticles caused enhanced oil recovery during Polymer Flooding by a factor of 10%. The distribution of DSNP solution during Flooding tests in pores and throats showed strong water-wetting of the medium after Flooding with this solution. The results of sessile drop experiments showed that coating with heavy oil, could make an oil-wet surface. Coating with distilled water and Polymer solution could partially alter the wettability of surface to water-wet and coating with DSNW and DSNP could make a strongly water-wet surface.
Guicai Liu - One of the best experts on this subject based on the ideXlab platform.
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chemical cleaning of ultrafiltration membranes for Polymer Flooding wastewater treatment efficiency and molecular mechanisms
Journal of Membrane Science, 2018Co-Authors: Guicai Liu, Liping Qiu, Ping Liu, Youbing Zhu, Zhiyua Liu, Dongsheng Zhao, Haiju YangAbstract:Abstract In a Polymer-Flooding wastewater treatment process, physically irreversible fouling of ultrafiltration (UF) membranes is severe and inevitable. Particularly, anionic polyacrylamide (APAM) aggravated flux loss is a challenge in flux recovery. Chemical cleaning procedures for polyvinylidene fluoride (PVDF) UF membranes fouled by Polymers (e.g., APAM) were designed by investigating their cleaning efficiency, synergistic effect and molecular interactions based on the molecular mechanisms of Polymeric fouling. The cleaning efficiency and foulant–foulant intermolecular interactions indicated that the destruction of the hydrogen-bonded network, egg-box shaped gel network, and interpenetrating Polymer network using sodium hypochlorite (NaClO), ethylenediaminetetraacetic acid (EDTA) and dodecyl trimethyl ammonium chloride (DTAC) solutions, respectively, led to significant flux recovery. The synergistic relationships between the two types of cleaning reagents were different in the mixed solutions and sequential procedures. In addition, oil emulsions facilitated the removal of APAM and slowed the flux loss. Finally, the flux recoveries and operational aspects in the pilot-scale UF experiments indicated that integration of the tested chemical cleaning procedures can efficiently remove membrane foulants and significantly restore membrane flux during Polymer-Flooding wastewater treatment of UF processes. These results are promising for controlling membrane fouling due to Polymeric foulants.
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molecular mechanisms of ultrafiltration membrane fouling in Polymer Flooding wastewater treatment role of ions in Polymeric fouling
Environmental Science & Technology, 2016Co-Authors: Guicai Liu, Haiju Yang, Yi Zhang, Zhiyua LiuAbstract:Polymer (i.e., anionic polyacrylamide (APAM)) fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and its relationships to intermolecular interactions were investigated using atomic force microscopy (AFM). Distinct relations were obtained between the AFM force spectroscopy measurements and calculated fouling resistance over the concentration polarization layer (CPL) and gel layer (GL). The measured maximum adhesion forces (Fad,max) were closely correlated with the CPL resistance (Rp), and the proposed molecular packing property (largely based on the shape of AFM force spectroscopy curve) of the APAM chains was related to the GL resistance (Rg). Calcium ions (Ca2+) and sodium ions (Na+) caused more severe fouling. In the presence of Ca2+, the large Rp corresponded to high foulant–foulant Fad,max, resulting in high flux loss. In addition, the Rg with Ca2+ was minor, but the flux recovery rate after chemical cleaning was the lowest, indicating that Ca2+ created more challenges in GL clea...
Ali Maghzi - One of the best experts on this subject based on the ideXlab platform.
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the impact of silica nanoparticles on the performance of Polymer solution in presence of salts in Polymer Flooding for heavy oil recovery
Fuel, 2014Co-Authors: Ali Maghzi, Ali Mohebbi, Riyaz Kharra, Mohammad Hossein GhazanfariAbstract:Abstract Due to role of Polymer in increasing sweep efficiency during oil recovery, much attention has been paid to the using Polymer solutions in enhanced oil recovery methods. In spite of the existence of the great researches in this area, the role of nanoparticles in modification of the Polymer performance in the presence of salts has not been examined before. Furthermore, there is no information about how the dispersed silica nanoparticles affect the heavy oil recovery during the Polymer Flooding in the presence of divalent cations. In this study, a series of Polymer Flooding experiments are performed in a quarter five-spot glass micromodel saturated with heavy oil. Solutions of polyacrylamide and dispersed silica nanoparticles in polyacrylamide (DSNP) with different salinities are used as the injectants to examine the effect of silica nanoparticles on the polyacrylamide performance in the presence of salts during Polymer Flooding of heavy oil, the oil recovery values were measured in different salinities. Furthermore, viscosity measurements are performed to help analyzing the results of Polymer Flooding tests. The oil recovery is measured via analysis of the continuously captured images during the displacement. Also, microscopic monitoring is used to analyze the distribution of residual heavy oil and Polymer solution at the pore level. The results showed that the oil recovery decreases by increasing the salt concentration during the polyacrylamide Flooding whereas in case of Flooding with suspension of silica nanoparticles in polyacrylamide, decreasing rate in oil recovery is lower. The results of viscosity measurements showed that increasing the salt concentration lowers the viscosity of polyacrylamide solution to a minimum value which at higher values salts had a reverse effect and increased solution viscosity. Moreover, viscosity of silica nanosuspension in polyacrylamide was higher than that of polyacrylamide solution at the same salinity. This increase in viscosity becomes more noticeable by increasing the silica nanoparticles concentration. Finally oil recovery values versus injectant viscosity were plotted for different condition of salinity which confirmed the previous results, it means oil recovery was increased wherever injectant viscosity has been increased.
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Pore-Scale Monitoring of Wettability Alteration by Silica Nanoparticles During Polymer Flooding to Heavy Oil in a Five-Spot Glass Micromodel
Transport in Porous Media, 2011Co-Authors: Ali Maghzi, Riyaz Kharrat, Ali Mohebbi, Mohammad Hossein GhazanfariAbstract:It is well known that the oil recovery is affected by wettability of porous medium; however, the role of nanoparticles on wettability alteration of medium surfaces has remained a topic of debate in the literature. Furthermore, there is a little information of the way dispersed silica nanoparticles affect the oil recovery efficiency during Polymer Flooding, especially, when heavy oil is used. In this study, a series of injection experiments were performed in a five-spot glass micromodel after saturation with the heavy oil. Polyacrylamide solution and dispersed silica nanoparticles in polyacrylamide (DSNP) solution were used as injected fluids. The oil recovery as well as fluid distribution in the pores and throats was measured with analysis of continuously provided pictures during the experiments. Sessile drop method was used for measuring the contact angles of the glass surface at different states of wettability after coating by heavy oil, distilled water, dispersed silica nanoparticles in water (DSNW), polyacrylamide solution, and DSNP solution. The results showed that the silica nanoparticles caused enhanced oil recovery during Polymer Flooding by a factor of 10%. The distribution of DSNP solution during Flooding tests in pores and throats showed strong water-wetting of the medium after Flooding with this solution. The results of sessile drop experiments showed that coating with heavy oil, could make an oil-wet surface. Coating with distilled water and Polymer solution could partially alter the wettability of surface to water-wet and coating with DSNW and DSNP could make a strongly water-wet surface.
Haiju Yang - One of the best experts on this subject based on the ideXlab platform.
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chemical cleaning of ultrafiltration membranes for Polymer Flooding wastewater treatment efficiency and molecular mechanisms
Journal of Membrane Science, 2018Co-Authors: Guicai Liu, Liping Qiu, Ping Liu, Youbing Zhu, Zhiyua Liu, Dongsheng Zhao, Haiju YangAbstract:Abstract In a Polymer-Flooding wastewater treatment process, physically irreversible fouling of ultrafiltration (UF) membranes is severe and inevitable. Particularly, anionic polyacrylamide (APAM) aggravated flux loss is a challenge in flux recovery. Chemical cleaning procedures for polyvinylidene fluoride (PVDF) UF membranes fouled by Polymers (e.g., APAM) were designed by investigating their cleaning efficiency, synergistic effect and molecular interactions based on the molecular mechanisms of Polymeric fouling. The cleaning efficiency and foulant–foulant intermolecular interactions indicated that the destruction of the hydrogen-bonded network, egg-box shaped gel network, and interpenetrating Polymer network using sodium hypochlorite (NaClO), ethylenediaminetetraacetic acid (EDTA) and dodecyl trimethyl ammonium chloride (DTAC) solutions, respectively, led to significant flux recovery. The synergistic relationships between the two types of cleaning reagents were different in the mixed solutions and sequential procedures. In addition, oil emulsions facilitated the removal of APAM and slowed the flux loss. Finally, the flux recoveries and operational aspects in the pilot-scale UF experiments indicated that integration of the tested chemical cleaning procedures can efficiently remove membrane foulants and significantly restore membrane flux during Polymer-Flooding wastewater treatment of UF processes. These results are promising for controlling membrane fouling due to Polymeric foulants.
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molecular mechanisms of ultrafiltration membrane fouling in Polymer Flooding wastewater treatment role of ions in Polymeric fouling
Environmental Science & Technology, 2016Co-Authors: Guicai Liu, Haiju Yang, Yi Zhang, Zhiyua LiuAbstract:Polymer (i.e., anionic polyacrylamide (APAM)) fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and its relationships to intermolecular interactions were investigated using atomic force microscopy (AFM). Distinct relations were obtained between the AFM force spectroscopy measurements and calculated fouling resistance over the concentration polarization layer (CPL) and gel layer (GL). The measured maximum adhesion forces (Fad,max) were closely correlated with the CPL resistance (Rp), and the proposed molecular packing property (largely based on the shape of AFM force spectroscopy curve) of the APAM chains was related to the GL resistance (Rg). Calcium ions (Ca2+) and sodium ions (Na+) caused more severe fouling. In the presence of Ca2+, the large Rp corresponded to high foulant–foulant Fad,max, resulting in high flux loss. In addition, the Rg with Ca2+ was minor, but the flux recovery rate after chemical cleaning was the lowest, indicating that Ca2+ created more challenges in GL clea...