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Masoud Riazi - One of the best experts on this subject based on the ideXlab platform.
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The impact of connate water saturation and salinity on oil recovery and CO2 storage capacity during Carbonated water injection in Carbonate Rock
Chinese Journal of Chemical Engineering, 2019Co-Authors: Mahmood Shakiba, Masoud Riazi, Mostafa TakbandAbstract:Abstract Carbonated water injection (CWI) is known as an efficient technique for both CO2 storage and enhanced oil recovery (EOR). During CWI process, CO2 moves from the water phase into the oil phase and results in oil swelling. This mechanism is considered as a reason for EOR. Viscous fingering leading to early breakthrough and leaving a large proportion of reservoir un-swept is known as an unfavorable phenomenon during flooding trials. Generally, instability at the interface due to disturbances in porous medium promotes viscous fingering phenomenon. Connate water makes viscous fingers longer and more irregular consisting of large number of tributaries leading to the ultimate oil recovery reduction. Therefore, higher in-situ water content can worsen this condition. Besides, this water can play as a barrier between oil and gas phases and adversely affect the gas diffusion, which results in EOR reduction. On the other hand, from gas storage point of view, it should be noted that CO2 solubility is not the same in the water and oil phases. In this study for a specified water salinity, the effects of different connate water saturations (Swc) on the ultimate oil recovery and CO2 storage capacity during secondary CWI are being presented using Carbonate Rock samples from one of Iranian Carbonate oil reservoir. The results showed higher oil recovery and CO2 storage in the case of lower connate water saturation, as 14% reduction of Swc resulted in 20% and 16% higher oil recovery and CO2 storage capacity, respectively.
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the impacts of aqueous ions on interfacial tension and wettability of an asphaltenic acidic crude oil reservoir during smart water injection
Journal of Chemical & Engineering Data, 2014Co-Authors: Mostafa Lashkarbolooki, Shahab Ayatollahi, Masoud RiaziAbstract:The use of adjusted/optimized saline water categorized into two different classes namely smart water (SW) and low salinity (LoSal) water injection has been proposed for more oil recovery from specific types of oil reservoirs. There are possible mechanisms concerning SW flooding that have been proposed in the literature, some of them are still subject to more examination. In this study, an experimental investigation is performed to determine the influence of type and amount of salt to the surface properties including interfacial tension (IFT) and contact angle (CA) of aqueous solution + acidic and asphaltenic crude oil + Carbonate Rock systems. For this purpose, the concentration of different salts including NaCl, KCl, Na2SO4, MgSO4, CaSO4, CaCl2, and MgCl2 are examined in a wide range of concentrations. The measurements revealed that salinity has dual impacts on the CA of water wet surfaces of Carbonate Rock. That is, CA could remain unchanged or increase as a function of brine salinity, though the increa...
Ajay Mandal - One of the best experts on this subject based on the ideXlab platform.
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Wettability Modification and Adsorption Characteristics of Imidazole-Based Ionic Liquid on Carbonate Rock: Implications for Enhanced Oil Recovery
2019Co-Authors: Prathibha Pillai, Ajay MandalAbstract:Carbonate reservoirs contain a significant amount of oil and gas reserves, but the ultimate recovery of these reserves is very low because of higher wettability of the Carbonate Rock relative to crude oil. Surfactant flooding is the most common method employed to increase the recovery with the main mechanism of wettability alteration, which to an extent depends on the mineralogical attributes of the reservoir. Ionic liquid (IL), which acts as a surface-active chemical, was employed to investigate its potential impact on oil recovery in Carbonate reservoirs. X-ray diffraction of the Carbonate reservoir Rock was done to determine the quantitative mineralogy of Rock samples. Fourier transform infrared spectroscopy of Carbonate reservoir Rock samples and the crude oil sample indicated that the polar components of crude oil are adsorbed onto the surfaces making it oil wet. SARA analysis of the crude oil determined the percentage of heavier fractions (asphaltene and resins), which have a direct impact on altering the wettability toward oil-wet. Experimental investigation revealed that, imidazolium-based ILs were able to alter the wettability from oil-wet to water-wet conditions. In the presence of salt and alkali, IL worked efficiently in reducing the contact angle and altering the wettability toward more water-wet. The loss of IL by adsorption on the Carbonate Rock was investigated, and the Langmuir isotherm was found to be the best fit. The effect of salt had a detrimental effect on adsorption density of IL, as it increases with increasing salt concentration. On the other hand, the addition of alkali with an optimum concentration of 1.5–2% was found to reduce the adsorption of IL on the Rock surface as alkali itself preferentially adsorbs on the Rock
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interfacial interaction of cationic surfactants and its effect on wettability alteration of oil wet Carbonate Rock
Energy & Fuels, 2016Co-Authors: Sunil Kumar, Priyanka Panigrahi, Ajay MandalAbstract:Oil recovery by water flooding from Carbonate reservoirs is considered ineffective because of the capillary forces in naturally fractured oil-wet Carbonate formations. Surfactant solutions are often recommended to enhance the oil recovery by both wettability alteration and reduction of interfacial tension (IFT). In this study, the effects of cationic surfactants from the trimethylammonium bromide (CnTAB) family, viz., C10TAB (BTAB), C15TAB (DTAB), C16TAB (TBAB), and C19TAB (CTAB), on the surface tension, IFT, and wettability alteration of a Carbonate Rock along with adsorption of the surfactant on the Carbonate Rock were investigated. Different analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), and Fourier transform infrared spectroscopy (FTIR), were conducted to study the mechanism for wettability alteration of the oil-wet Carbonate surface. Results demonstrated that, among the four surfactants used, C15TAB and C19TAB presented a ...
A Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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effects of water soluble ions on wettability alteration and contact angle in smart and Carbonated smart water injection process in oil reservoirs
Journal of Molecular Liquids, 2017Co-Authors: Abbas Khaksar Manshad, Iman Nowrouzi, A MohammadiAbstract:Abstract As the demand for crude oil increases, the oil-producing countries try to increase production. Enhanced Oil Recovery (EOR) techniques play a significant role in improving oil production. Improved or smart water injection, among the methods, has higher performance due to its low cost. Carbonated smart water is injected to improve smart water capabilities. Dissolution of carbon dioxide in water will change chemical properties of the injected water to facilitate wettability alteration from hydrophobic to hydrophilic more effectively. Besides, it causes swelling and changes of oil density and viscosity by transferring from the aqueous phase to the oil phase. Adding CO 2 to the smart solution can have other effects, expressed as dissolution and Carbonate Rock weight alteration, in addition to the wettability alteration on Carbonate Rock. In this communication, NaCl, KCl, Kl, MgCl 2 , CaCl 2 , Na 2 SO 4 , MgSO 4 , and K 2 SO 4 were used to produce smart water, and CO 2 gas was utilized to Carbonate the water. Observational/visual and contact angle tests were then carried out to express wettability alteration of Carbonate Rock with smart water and Carbonated smart water. These observational tests clearly indicate the wettability alteration property of injected materials. Carbonated smart water exposed to Rock analysis shows that Mg 2 + ion was higher in comparison with Ca 2 + rate in tested Carbonate Rock. Finally, by conducting tests on oil production imbibitions, we show that the smart water while utilizing the provided mechanism is capable of improving the oil production in contrast to imbibitions with normal water, such that the imbibitions with smart water increases the production 33% more in contrast to production with initial formation water.
Mostafa Lashkarbolooki - One of the best experts on this subject based on the ideXlab platform.
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the impacts of aqueous ions on interfacial tension and wettability of an asphaltenic acidic crude oil reservoir during smart water injection
Journal of Chemical & Engineering Data, 2014Co-Authors: Mostafa Lashkarbolooki, Shahab Ayatollahi, Masoud RiaziAbstract:The use of adjusted/optimized saline water categorized into two different classes namely smart water (SW) and low salinity (LoSal) water injection has been proposed for more oil recovery from specific types of oil reservoirs. There are possible mechanisms concerning SW flooding that have been proposed in the literature, some of them are still subject to more examination. In this study, an experimental investigation is performed to determine the influence of type and amount of salt to the surface properties including interfacial tension (IFT) and contact angle (CA) of aqueous solution + acidic and asphaltenic crude oil + Carbonate Rock systems. For this purpose, the concentration of different salts including NaCl, KCl, Na2SO4, MgSO4, CaSO4, CaCl2, and MgCl2 are examined in a wide range of concentrations. The measurements revealed that salinity has dual impacts on the CA of water wet surfaces of Carbonate Rock. That is, CA could remain unchanged or increase as a function of brine salinity, though the increa...
Gao Gan - One of the best experts on this subject based on the ideXlab platform.
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a comparative study of the organic matter characteristics of stylolite and matrix in Carbonate Rock
Natural Gas Geoscience, 2014Co-Authors: Gao GanAbstract:As an important geological phenomenon in Carbonate Rocks,stylolites are the places where organic matter is enriched and fluid is discharged.The comparative study of organic matter abundance between stylolite and Carbonate Rock matrix is advantageous to understand organic matter enrichment and hydrocarbon expulsion of stylolite.By analysis of the content of insoluble matter in acid,total organic carbon(TOC)and pyrolytical(Rock-Eval)products of Carbonate Rock and stylolite,detailed study has been carried out on the enrichment characteristics,inheritance,hydrocarbon expulsion differentials of organic matter in matrix and stylolite.The content of insoluble matter in acid is an important index of organic matter abundance of Carbonate Rocks.Matrix with low level of insoluble matter normally corresponds to low amount of organic matter,while the stylolites with high level of insoluble matter will correspond to high level of organic matter.As a source Rock,stylolite is much better than matrix.The stylolite has better TOC,generated and expelled hydrocarbon,and its hydrocarbon generation potential is similar to that of matrix.Their organic matter abundance had good succession.The difference of generated hydrocarbon amount per unit mass TOCbetween stylolite and matrix indicated that hydrocarbon expulsion conditions in stylolite were superior to that in matrix.Stylolite is significant to generation,expulsion and accumulation of hydrocarbon.