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Anthony R. Kovscek - One of the best experts on this subject based on the ideXlab platform.
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effect of pressure on crude oil kInetics durIng In Situ Combustion
Energy & Fuels, 2020Co-Authors: Kyu Hun Koh Yoo, Margot Gerritsen, Martha Liliana Trujillo Portillo, Christian Patino Ramirez, Luiz Sampaio, Anthony R. KovscekAbstract:We study the effects of pressure on crude-oil oxidation kInetics usIng ramped temperature oxidation for a large range of pressures and heatIng rates (1.5, 2.0, 5.0, 7.5, 8.0, 10.0, 15.0, 20.0, and ...
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Investigation of the effects of select metal nanoparticles on heavy oil Combustion In porous media
Energy & Fuels, 2020Co-Authors: Usua U Amanam, L M Castanier, Kuy Hun Koh Yoo, Anthony R. KovscekAbstract:Nanometals are useful for improvIng the effectiveness of In Situ Combustion-enhanced oil recovery. The effects of five different transition-metal nanoparticles on Colombian, Venezuelan, and Mexican...
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PulsatIng lInear In Situ Combustion: why do we often observe oscillatory behavior?
Computational Geosciences, 2018Co-Authors: Mohammad Bazargan, Anthony R. KovscekAbstract:We have studied simplified, pulsatIng, one-dimensional, In Situ Combustion processes. For two cases, with different reaction stoichiometry, oscillations In temperature, flue gas rate, and flue gas composition are demonstrated and the parameter space resultIng In oscillatory behavior is identified. To understand the role of different parameters, lInear stability of the problem is studied. Because lInear stability analysis requires the solution of uniform front propagation, we Investigated an asymptotic analytical solution of the problem. We found an origInal formula for the front propagation velocity. The analytical solution enabled us to defIne four dimensionless parameters IncludIng Zeldovich (Ze) number, Damkohler (Da) number, a specialized air-fuel ratio (B), and a ratio IncorporatIng air and rock heat capacities (Δ_1). UsIng lInear stability analysis, we show that the stability of the problem is also governed by these four parameters. Because Δ_1 ≈ 1 for typical laboratory conditions, the set of (Ze, Da, B) is used to construct the stability plane; consequently, several important design considerations are suggested. Both larger air Injection rate and air enriched In oxygen Increase the front propagation speed but push the system toward oscillatory behavior. Conversely, the Introduction of catalysts and metal additives, that decrease the activation energy of reactions, Increases the front speed and stability. Similarly, IncreasIng the amount of fuel available for the Combustion makes the design more stable and drives the Combustion front to propagate more quickly.
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consistency measures for isoconversional Interpretation of In Situ Combustion reaction kInetics
Energy & Fuels, 2014Co-Authors: Bo Chen, L M Castanier, Anthony R. KovscekAbstract:The reaction kInetics of an In Situ Combustion process were studied via ramped temperature oxidation withIn a kInetic cell system. A methodology is established for rapid assessment of consistency among the various heatIng programs needed to Interpret the apparent activation energy versus conversion or temperature. The isoconversional prInciple based on multiple programs of temperature versus time is applicable to Interpret the apparent activation energies of the series and coupled reactions comprisIng crude-oil Combustion. The issue of measurement consistency was studied usIng both simulations and experiments. Three sets of ramped temperature oxidation experiments of different reactor designs, different air Injection rates, and different sample mixture sizes were conducted. Both experimental and simulation results support that the isoconversional prInciple is a model-free Interpretation tool and the prInciple is promisIng for the study of crude-oil reaction kInetics that Involve multiphase, multicomponent...
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Combustion kInetics of heavy oils In porous media
Energy & Fuels, 2011Co-Authors: Murat Cinar, L M Castanier, Anthony R. KovscekAbstract:In this study, the kInetics of heavy crude-oil Combustion In porous media are reported. Ramped temperature oxidation (RTO) tests with effluent gas analysis are conducted to probe In Situ Combustion (ISC) reaction kInetics along with isothermal coke formation experiments. The role of oxygen on coke formation reactions (i.e., fuel formation for ISC) is Investigated usIng X-ray photoelectron spectroscopy (XPS) of Intermediate reaction products. The XPS data is analyzed along with companion RTO experiments to obtaIn a simplified multistep reaction scheme. Synthetic cases illustrate the connection between a proposed reaction scheme for oil/matrix pairs and one-dimensional Combustion front propagation. Analysis of experimental results illustrate that the reaction scheme is capable of reproducIng experimental results IncludIng the basic trends In oxygen consumption and carbon oxides production for RTO experiments as a function of heatIng rate for both good and poor ISC candidates. The combInation of XPS and RTO ...
Tayfun Babadagli - One of the best experts on this subject based on the ideXlab platform.
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status of electromagnetic heatIng for enhanced heavy oil bitumen recovery and future prospects a review
Applied Energy, 2015Co-Authors: Achinta Bera, Tayfun BabadagliAbstract:Abstract Thermal methods are Inevitable In heavy oil/bitumen recovery. Different types of “aqueous” methods such as cyclic steam and hot water Injection, In-Situ Combustion, hot water and steam floodIng, and steam assisted gravity draInage have been widely applied over decades. Currently, non-aqueous heatIng methods, generally named electromagnetic, are In consideration as an alternative to the aqueous methods, which may not be applicable due to technical and environmental limitations. This technique still requires further research and field scale pilot applications to prove their technical and economic viability. In this paper, a critical discussion on the review of electromagnetic heatIng is presented. An attempt is undertaken to review most of the research works (computational and experimental as well as a limited number of field applications) performed over more than five decades. After evaluatIng aqueous and non-aqueous thermal methods, a comparative analysis is presented.
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status of electromagnetic heatIng for enhanced heavy oil bitumen recovery and future prospects a review
Applied Energy, 2015Co-Authors: Achinta Bera, Tayfun BabadagliAbstract:Thermal methods are Inevitable In heavy oil/bitumen recovery. Different types of “aqueous” methods such as cyclic steam and hot water Injection, In-Situ Combustion, hot water and steam floodIng, and steam assisted gravity draInage have been widely applied over decades. Currently, non-aqueous heatIng methods, generally named electromagnetic, are In consideration as an alternative to the aqueous methods, which may not be applicable due to technical and environmental limitations. This technique still requires further research and field scale pilot applications to prove their technical and economic viability.
Nashaat N Nassar - One of the best experts on this subject based on the ideXlab platform.
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pyrolysis and oxidation of asphaltene born coke like residue formed onto In Situ prepared nio nanoparticles toward advanced In Situ Combustion enhanced oil recovery processes
Energy & Fuels, 2018Co-Authors: Azadeh Amrollahi Biyouki, Negahdar Hosseinpour, Nashaat N NassarAbstract:Pyrolysis and oxidation of asphaltene-born coke-like residue formed onto ex Situ and In Situ prepared NiO nanoparticles as Initial steps toward developIng advanced In Situ Combustion enhanced oil recovery (EOR) processes were studied. The In Situ synthesized NiO nanoparticles In heavy oil matrix, contaInIng coke-like residue, were characterized by X-ray diffraction, Brunauer–Emmett–Teller, field-emission scannIng electron microscopy, and energy-dispersive X-ray mappIng techniques. The pyrolysis and postpyrolysis oxidation of the coke residue were Investigated by temperature-programmed pyrolysis (TPP) and temperature-programmed oxidation (TPO) methods, respectively. Oxidation kInetics of the coke residue was described by the KissInger–Akahira–Sunose isoconversional method. The results showed a higher percentage of coke residue on the In Situ prepared nanoparticles than the ex Situ employed ones. Eventually, durIng the TPP of the coke residue, the amount of carbon oxides released per total amount of the cok...
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Pyrolysis and Oxidation of Asphaltene-Born Coke-like Residue Formed onto In Situ Prepared NiO Nanoparticles toward Advanced In Situ Combustion Enhanced Oil Recovery Processes
2018Co-Authors: Azadeh Amrollahi Biyouki, Negahdar Hosseinpour, Nashaat N NassarAbstract:Pyrolysis and oxidation of asphaltene-born coke-like residue formed onto ex Situ and In Situ prepared NiO nanoparticles as Initial steps toward developIng advanced In Situ Combustion enhanced oil recovery (EOR) processes were studied. The In Situ synthesized NiO nanoparticles In heavy oil matrix, contaInIng coke-like residue, were characterized by X-ray diffraction, Brunauer–Emmett–Teller, field-emission scannIng electron microscopy, and energy-dispersive X-ray mappIng techniques. The pyrolysis and postpyrolysis oxidation of the coke residue were Investigated by temperature-programmed pyrolysis (TPP) and temperature-programmed oxidation (TPO) methods, respectively. Oxidation kInetics of the coke residue was described by the KissInger–Akahira–Sunose isoconversional method. The results showed a higher percentage of coke residue on the In Situ prepared nanoparticles than the ex Situ employed ones. Eventually, durIng the TPP of the coke residue, the amount of carbon oxides released per total amount of the coke is 18.6% higher for the In Situ NiO as compared to the ex Situ NiO nanoparticles. This may be attributed to the uniform dispersion of the In Situ NiO In the coke residue. Furthermore, compared to the ex Situ NiO, the In Situ NiO nanoparticles shift the oxidation temperature of the coke residue by about 100 °C to lower temperature. Multistep kInetics was predicted with a significant drop of the activation energy of the oxidation of the coke residue In the presence of In Situ and ex Situ NiO nanoparticles, confirmIng their catalytic effect. However, the pre-exponential factor, as a representation of the collision efficiency, is significantly higher over the In Situ NiO compared to the ex Situ NiO, leadIng to the enhanced oxidation of the coke residue. This may be attributed to the loss of surface area due to particle aggregation for the case of ex Situ preparation, as well as the orientation of asphaltene molecules durIng the adsorption onto the surface. The asphaltenes could be aligned mostly vertically over the In Situ NiO surface; thus the vertical alignment provides good channels for diffusion of gas-phase oxygen onto the surface leadIng to high collision efficiency and catalytic activity
Varfolomeev M. - One of the best experts on this subject based on the ideXlab platform.
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Combustion behavior of aromatics and their Interaction with n-alkane In In-Situ Combustion enhanced oil recovery process: Thermochemistry
2020Co-Authors: Yua C., Emelianov D., Varfolomeev M., Abaas M.Abstract:© 2019 The Korean Society of Industrial and EngIneerIng Chemistry The Combustion behavior of aromatics (p-quaterphenyl, thioxanthone, pyrene) and their Interaction with n-alkane (tetracosane) were Investigated by high-pressure differential scannIng calorimetry (HP-DSC). Tetracosane only showed low-temperature oxidation (LTO), while p-quaterphenyl and thioxanthone only showed high-temperature oxidation (HTO). Pyrene exhibited a unique middle-high temperature oxidation (M-HTO). Tetracosane significantly promoted the HTO of p-quaterphenyl and thioxanthone, and shifted their HTO Into lower temperatures. While p-quaterphenyl and thioxanthone did not significantly affect the occurrence of the LTO of tetracosane, but they did reduce the heat release and reaction rate of the LTO of tetracosane. The co-oxidation of tetracosane and pyrene triggered an Intense Interaction that exerts a strong Inhibition on the LTO of tetracosane, and Induces an explosive oxidation reaction followed by a mild oxidation from 280 to 325 °C. The Intense Interaction also significantly promoted the HTO of the pyrene. In general, the Interaction strength is In turn pyrene + tetracosane > thioxanthone + tetracosane > p-quaterphenyl + tetracosane. Due to the strong Interaction between the alkane and aromatics durIng their co-oxidation, the additivity of heat release In both LTO and HTO cannot be applied In terms of reaction process as well as total heat release
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Study of the Radical ChaIn Mechanism of Hydrocarbon Oxidation for In Situ Combustion Process
2020Co-Authors: Ushakova A., Varfolomeev M., Emelyanov D.Abstract:© 2017 Alexandra Ushakova et al.Despite the abundance of In Situ Combustion models of oil oxidation, many of the effects are still beyond consideration. For example, until now, Initial stages of oxidation were not considered from a position of radical chaIn process. This is a serious difficulty for the simulation of oil recovery process that Involves air Injection. To Investigate the Initial stages of oxidation, the paper considers the sequence of chemical reactions, IncludIng Intermediate short-livIng compounds and radicals. We have attempted to correlate the maIn stages of the reaction with areas of heat release observed In the experiments. The system of differential equations based on the equations of oxidation reactions was solved. Time dependence of peroxides formation and start of heat release is analytically derived for the Initial stages. We have considered the Inhibition of Initial oxidation stages by aromatic oil compounds and have studied the Induction time In dependence on temperature. ChaIn ignition criteria for paraffIns and crude oil In presence of core samples were obtaIned. The calculation results are compared with the stages of oxidation that arise by high-pressure differential scannIng calorimetry. AccordIng to experimental observations we have determIned which reactions are important for the process and which can be omitted or combIned Into one as Insignificant
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Interaction between aromatics and n-alkane for In-Situ Combustion process
2020Co-Authors: Yuan C., Varfolomeev M., Khachatrian A.Abstract:© 2019 Elsevier B.V. In this research, the effect of p-quaterphenyl and cumene hydroperoxide on tetracosane Combustion was Investigated usIng acceleratIng rate calorimetry (ARC). Two obvious reaction processes were identified as Induction period and ignition period for tetracosane Combustion. p-Quaterphenyl showed a strong suppression on tetracosane Combustion: prolonged Induction period, suppressed the reaction rate of Intense exothermic reaction, and delayed the occurrence of ignition period. Cumene hydroperoxide also exhibited a delay effect In ignition period, but it can slightly promote the exothermic reaction In reduction period and shortened the duration of Induction period due to the presence of hydroperoxide group. We fInd that the Arrhenius zero-order kInetic model (lnk∗=lnA− [Formula presented] [Formula presented] ) fitted experimental data reasonably well In Induction period, while nth-order reaction model ( [Formula presented] =A∗f(α)∗exp(− [Formula presented] ), where f(α)=(1−α)n) is more suitable for estimatIng kInetics In the ignition period as the Intense exothermic process is dependent of both hydrocarbons and oxygen concentration. However, when there is a strong Interaction between tetracosane and p-quaterphenyl durIng their co-Combustion, nth-order reaction model cannot be applied well for ignition period, Instead, GInstlIng-BrounshteIn diffusion model (1.5/((1−α)1/3−1)) fitted much better with experimental data, IndicatIng that diffusion might play an important role In ignition period. This means that the Interaction between components should be considered when simulatIng crude oil Combustion In In-Situ Combustion (ISC) process, and couplIng diffusion to reaction-kInetic model to control mass transfer might be necessary and helpful for its precise simulation
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A prelimInary feasibility analysis of In Situ Combustion In a deep fractured-cave carbonate heavy oil reservoir
2020Co-Authors: Chen Y., Varfolomeev M., Pu W., Liu X., Li Y., Hui J.Abstract:© 2018 As an effective thermal-enhanced oil recovery technique, In-Situ Combustion (ISC) can achieve large oil displacement efficiency and upgrade the heavy oil technically, but there are still various barriers for ISC application In naturally fractured carbonate heavy reservoirs. In addition, the potential risk of wellbore pluggIng and formation collapse, caused by the possibility of carbonate rock decomposition at high temperatures, furtherly hInders the application of ISC technique and focuses more attention on feasibility evaluation. Hence, this paper attempted to estimate the prelimInary feasible application of ISC In Tahe oilfield, characterized with fractured-cave carbonate heavy reservoir. From macro and micro aspects, results Indicated that owIng to large microscopic surface area and high oxygen contact ability between the deposited coke and oxygen, the oxidized ultra-heavy oil, under adiabatic condition, In simulative fractured-cave carbonate oil reservoir was successfully ignited and maIntaIned the Combustion process with the Combustion front temperature. Besides, a large amount of heat generation from the Combustion front can activate the ultra-heavy oil with better mobility ability. Additionally, In this process, the decomposition process of Tahe carbonate rock was not triggered (∼631.6 °C) where the decomposition risk of runnIng In-Situ Combustion process In Tahe carbonate reservoir can be neglected. PrelimInarily, it implied that ISC is a feasible technique to upgrade the ultra-heavy oil for Tahe oilfield
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Low-temperature Combustion behavior of crude oils In porous media under air flow condition for In-Situ Combustion (ISC) process
2020Co-Authors: Yuan C., Varfolomeev M., Pu W., Sadikov K., Khaliullin R., Al-muntaser A., Saeed Mehrabi-kalajahi S.Abstract:© 2019 Elsevier Ltd A porous medium thermo-effect cell (PMTEC) was developed to fast characterize the Combustion of crude oils In porous media In air flow for air Injection enhanced oil recovery (EOR) process. We described how PMTEC works and employed it to Investigate the Combustion behavior of seven crude oils IncludIng two light oils, two medium oils, two heavy oils, and one extra heavy oil. The results showed that, except the two light oils, the others exhibited a strong low-temperature Combustion (LTC) phenomenon at about 270–280 °C with a high temperature Increase to approximately 700 °C and the release of CO2 and CO gaseous products. This LTC behavior was compared with the widely documented oxidation behavior In air Injection process IncludIng low-temperature oxidation (LTO) and high-temperature oxidation (HTO) characterized by high-pressure differential scannIng calorimetry (HP-DSC). It turned out that the LTC occurred In PMTEC was different from the LTO or HTO observed from HP-DSC experiments. In addition, this LTC can propagate In porous media with air flow, which was detected by a newly developed optical fibre technology Instead of traditional thermal couples. Furthermore, the effect of copper stearate, iron stearate, nickel stearate, and cobalt stearate as oil-soluble catalysts on the LTC was Investigated. Copper stearate showed the best catalytic effect. It significantly shifted onset and peak temperatures Into lower temperature from 278 and 287 °C to 227 and 237 °C, respectively, exhibitIng a great potential In catalyzIng crude oils Combustion In ISC process. The catalytic effect of these four catalysts is In turn: copper > iron > cobalt > nickel
Achinta Bera - One of the best experts on this subject based on the ideXlab platform.
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status of electromagnetic heatIng for enhanced heavy oil bitumen recovery and future prospects a review
Applied Energy, 2015Co-Authors: Achinta Bera, Tayfun BabadagliAbstract:Abstract Thermal methods are Inevitable In heavy oil/bitumen recovery. Different types of “aqueous” methods such as cyclic steam and hot water Injection, In-Situ Combustion, hot water and steam floodIng, and steam assisted gravity draInage have been widely applied over decades. Currently, non-aqueous heatIng methods, generally named electromagnetic, are In consideration as an alternative to the aqueous methods, which may not be applicable due to technical and environmental limitations. This technique still requires further research and field scale pilot applications to prove their technical and economic viability. In this paper, a critical discussion on the review of electromagnetic heatIng is presented. An attempt is undertaken to review most of the research works (computational and experimental as well as a limited number of field applications) performed over more than five decades. After evaluatIng aqueous and non-aqueous thermal methods, a comparative analysis is presented.
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status of electromagnetic heatIng for enhanced heavy oil bitumen recovery and future prospects a review
Applied Energy, 2015Co-Authors: Achinta Bera, Tayfun BabadagliAbstract:Thermal methods are Inevitable In heavy oil/bitumen recovery. Different types of “aqueous” methods such as cyclic steam and hot water Injection, In-Situ Combustion, hot water and steam floodIng, and steam assisted gravity draInage have been widely applied over decades. Currently, non-aqueous heatIng methods, generally named electromagnetic, are In consideration as an alternative to the aqueous methods, which may not be applicable due to technical and environmental limitations. This technique still requires further research and field scale pilot applications to prove their technical and economic viability.
