The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
A Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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effects of ions and dissolved carbon dioxide in brine on wettability alteration contact angle and oil production in smart water and carbonated smart water injection processes in carbonate oil reservoirs
Fuel, 2019Co-Authors: Iman Nowrouzi, Abbas Khaksar Manshad, A MohammadiAbstract:Abstract Imbibition is one of main production mechanisms in fractured carbonate reservoirs. This mechanism is very dependent on hydrophilicity of reservoir rock and somehow is controlled by it. The contact angle tests, due to the test conditions, i.e, a polished rock section-crude oil droplet system, do not easily indicate the wettability of the porous medium but generally, are accepted to expression of rock wettability. Imbibition tests with a strong dependence on wettability can generalize contact angle tests to wettability of porous medium. Carbonated smart water injection can active water imbibition mechanism and increase production in fractured carbonate reservoirs by wettability alteration to hydrophilic. In this study, the optimal concentration of saline water used with oil in Karanj and Gachsaran reservoirs in Iran was determined by calculating the contact angle in different concentrations and dilutions. Then, the optimal solutions were carbonated by adding carbon dioxide at various temperatures and pressures. The effect of carbon dioxide on wettability of pre-hydrophobized sections was investigated by contact angle experiments. The results show the efficiency of carbonated smart water in wettability alteration as compared with smart water. Then, oil-saturated carbonate plugs were exposed to spontaneous imbibition by optimal solutions in the presence and absence of carbon dioxide. The experiments reveal an increase in oil recovery by imbibition with carbonated smart water. The results of these experiments indicate the water alteration efficiency of carbonated smart water compared with the smart water. A minimum contact angle of 18.75° was obtained by adding carbon dioxide to a smart solution at a concentration of 1000 ppm of different salts and at 10.34 MPa and 75 °C. Then, oil-saturated carbonate plugs were exposed to imbibition process with optimal solutions in the presence and absence of carbon dioxide. According to the results of these experiments, oil recovery increased by 78% of the Initial oil in place by imbibition in the presence of carbonated smart water.
Abbas Khaksar Manshad - One of the best experts on this subject based on the ideXlab platform.
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effects of ions and dissolved carbon dioxide in brine on wettability alteration contact angle and oil production in smart water and carbonated smart water injection processes in carbonate oil reservoirs
Fuel, 2019Co-Authors: Iman Nowrouzi, Abbas Khaksar Manshad, A MohammadiAbstract:Abstract Imbibition is one of main production mechanisms in fractured carbonate reservoirs. This mechanism is very dependent on hydrophilicity of reservoir rock and somehow is controlled by it. The contact angle tests, due to the test conditions, i.e, a polished rock section-crude oil droplet system, do not easily indicate the wettability of the porous medium but generally, are accepted to expression of rock wettability. Imbibition tests with a strong dependence on wettability can generalize contact angle tests to wettability of porous medium. Carbonated smart water injection can active water imbibition mechanism and increase production in fractured carbonate reservoirs by wettability alteration to hydrophilic. In this study, the optimal concentration of saline water used with oil in Karanj and Gachsaran reservoirs in Iran was determined by calculating the contact angle in different concentrations and dilutions. Then, the optimal solutions were carbonated by adding carbon dioxide at various temperatures and pressures. The effect of carbon dioxide on wettability of pre-hydrophobized sections was investigated by contact angle experiments. The results show the efficiency of carbonated smart water in wettability alteration as compared with smart water. Then, oil-saturated carbonate plugs were exposed to spontaneous imbibition by optimal solutions in the presence and absence of carbon dioxide. The experiments reveal an increase in oil recovery by imbibition with carbonated smart water. The results of these experiments indicate the water alteration efficiency of carbonated smart water compared with the smart water. A minimum contact angle of 18.75° was obtained by adding carbon dioxide to a smart solution at a concentration of 1000 ppm of different salts and at 10.34 MPa and 75 °C. Then, oil-saturated carbonate plugs were exposed to imbibition process with optimal solutions in the presence and absence of carbon dioxide. According to the results of these experiments, oil recovery increased by 78% of the Initial oil in place by imbibition in the presence of carbonated smart water.
Iman Nowrouzi - One of the best experts on this subject based on the ideXlab platform.
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effects of ions and dissolved carbon dioxide in brine on wettability alteration contact angle and oil production in smart water and carbonated smart water injection processes in carbonate oil reservoirs
Fuel, 2019Co-Authors: Iman Nowrouzi, Abbas Khaksar Manshad, A MohammadiAbstract:Abstract Imbibition is one of main production mechanisms in fractured carbonate reservoirs. This mechanism is very dependent on hydrophilicity of reservoir rock and somehow is controlled by it. The contact angle tests, due to the test conditions, i.e, a polished rock section-crude oil droplet system, do not easily indicate the wettability of the porous medium but generally, are accepted to expression of rock wettability. Imbibition tests with a strong dependence on wettability can generalize contact angle tests to wettability of porous medium. Carbonated smart water injection can active water imbibition mechanism and increase production in fractured carbonate reservoirs by wettability alteration to hydrophilic. In this study, the optimal concentration of saline water used with oil in Karanj and Gachsaran reservoirs in Iran was determined by calculating the contact angle in different concentrations and dilutions. Then, the optimal solutions were carbonated by adding carbon dioxide at various temperatures and pressures. The effect of carbon dioxide on wettability of pre-hydrophobized sections was investigated by contact angle experiments. The results show the efficiency of carbonated smart water in wettability alteration as compared with smart water. Then, oil-saturated carbonate plugs were exposed to spontaneous imbibition by optimal solutions in the presence and absence of carbon dioxide. The experiments reveal an increase in oil recovery by imbibition with carbonated smart water. The results of these experiments indicate the water alteration efficiency of carbonated smart water compared with the smart water. A minimum contact angle of 18.75° was obtained by adding carbon dioxide to a smart solution at a concentration of 1000 ppm of different salts and at 10.34 MPa and 75 °C. Then, oil-saturated carbonate plugs were exposed to imbibition process with optimal solutions in the presence and absence of carbon dioxide. According to the results of these experiments, oil recovery increased by 78% of the Initial oil in place by imbibition in the presence of carbonated smart water.
Pankaj Tiwari - One of the best experts on this subject based on the ideXlab platform.
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influence of emulsification interfacial tension wettability alteration and saponification on residual oil recovery by alkali flooding
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Rahul Saha, Ravindra Uppaluri, Pankaj TiwariAbstract:Abstract The current study examines the synergy of interfacial tension, emulsification, wettability alteration and extent of saponification during alkali flooding for light to moderate crude oil. The oil recovered in the effluent stream during NaOH flooding was analysed to observe the quality of water in oil (W/O) emulsion produced and the extent of saponification. Core flooding experiments showed higher oil recovery of 25.48% Initial oil in place (IOIP) at 1 wt% NaOH. Effects of slug volume and injection pattern during NaOH flooding experiments were also investigated. Further, contact angle changes the wettability from water wet to favourable intermediate wet.
Mehran Sohrabi - One of the best experts on this subject based on the ideXlab platform.
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intermittent co2 and viscosity reducing gas vrg injection for enhanced heavy oil recovery
Fuel Processing Technology, 2017Co-Authors: Seyyed Mehdi Seyyedsar, Mehran SohrabiAbstract:Abstract The results of three coreflood experiments are reported which were performed to investigate intermittent CO2 and viscosity-reducing gas (VRG) injection for enhanced heavy oil recovery (EHOR). This injection strategy is particularly suitable for heavy and viscous oil reservoirs as it enhances the contact between the resident oil and injected fluid. The recovery efficiency of continuous injection is low due to the high viscosity ratio between the oil and injection fluid. The intermittent injection of liquid CO2 for 4 cycles resulted in the recovery of 12% of the Initial oil in place (IOIP) while in the second experiment, 9 cycles of intermittent supercritical CO2 injection recovered 38% IOIP. In the third experiment, 5 cycles of intermittent VRG injection led to the recovery of 22% IOIP. The results demonstrate that a higher quality oil than the original oil in the core is recovered during the periods of CO2 and VRG injection. However, it is shown that different mechanisms were contributing to oil recovery during CO2 and VRG injection. The results of the simulation study imply that the mechanism of extraction of hydrocarbons by CO2 would be an important reason for the recovery of higher quality oil during the periods of CO2 injection whereas its impact is less pronounced when the injection gas is a hydrocarbon gas. However, the extraction of hydrocarbons to the CO2-rich phase could not be fully responsible for the higher quality oil recovery and it is discussed that how this mechanism could affect the flow of CO2 and oil in porous media.
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oil recovery improvement from low salinity waterflooding in a clay free silica core
IOR 2015 - 18th European Symposium on Improved Oil Recovery, 2015Co-Authors: Seyed Amir Farzaneh, Mehran Sohrabi, John Robert Mills, Pedram Mahzari, K AhmedAbstract:Laboratory and field trials have demonstrated that oil recovery may be improved by injecting low salinity brine as a simple and cost-effective EOR method to sweep oil, provide pressure support and produce trapped oil. A single physiochemical theory for this improved recovery mechanism has remained elusive due to the complex nature of rock-fluid and fluid-fluid interactions. Wettability alteration has been identified as a consequence of low salinity water injection, which is supported by underlying theory governing surface forces. This paper delineates the potential mechanisms involved in this process and demonstrates that low salinity water has a positive response in a homogeneous borosilicate core that is absent of clay. Utilising this core material demonstrates great synergy between previously reported 2D micromodel observations with a 3D pore network at reservoir conditions. Various injection scenarios are presented. Injecting low salinity brine into the aged core first, gave a recovery of 60% of the Initial oil in place (IOIP) at the end of the first injection phase. Repeating the experiment afresh with high salinity brine gave 50% IOIP whereas high salinity injection into an un-aged core gave 34% IOIP at the end of the first stage of injection. Ultimate recovery was highest by cyclic injection of low salinity brine followed by high salinity brine. Chemical changes in the produced oil were measured with infrared and supported with visual observations of recovered oil and brine that indicated stable micro-emulsions during low salinity brine injection. This highlights the importance of fluid-fluid interactions as an area of required investigation.