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RISS 인기검색어
- 검색키워드
- 저자 : Jitendra S. Sangwai (검색결과 5 건)
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Tushar Sharma,Jitendra S. Sangwai,G. Suresh Kumara 한국자원공학회 2014 Geosystem engineering Vol.17 No.3
A conventional waterflood often leads to unsuccessful recovery of oil, as most of the injected water tends to channel into the more permeable zones. Pickering emulsions stabilized using surfactant and colloidal particles, such as nanoparticles, are gaining wider recognition in the petroleum industry due to their better thermal stability and stabilized flow behavior. In this work, a novel formulation of oil-in-water (o/w) emulsion stabilized using nanoparticle–surfactant–polymer in the presence of salt (NaCl) is investigated for improved oil recovery at conditions of high pressure (13.6MPa) and high temperature (313–363 K).We report a comparative study of performance of o/w emulsion flooding with conventional water flooding for enhanced oil recovery of a crude oil having a viscosity of 161 mPa s at 313K in a Berea sandstone core using core-flood experiments. The results of core flooding tests show that an incremental oil recovery of more than 23% of original oil in place over water flooding can be obtained using an emulsion flooding formulated in this work.
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N. Sakthipriya,Jitendra S. Sangwai,Mukesh Doble 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
This study reports the production of biosurfactant from Pseudomonas aeruginosa and Pseudomonasfluorescens with waxes namely, n-hexadecane and n-eicosane as carbon sources. The latter organismproduced 9.8 and 8.2 g L 1 of rhamnolipid containing C8 and C10 fatty acid with n-eicosane and nhexadecaneas substrates, respectively, whereas, the former produced 5.7 and 11.5 g L 1 of C10 and C12fatty acids. Both the microorganisms were observed to degrade 85–90% of the waxes in one day andachieved very high cell surface hydrophobicity in a short period and indicates their ability of quickadherence to hydrophobic surfaces. The produced biosurfactant was stable upto 100 8C temperature,8 MPa pressure, 20% (w/v) salinity and alkaline pH. Reaction kinetics was mathematically modeled usingthe Monod and Logistic growth model. The Logistic growth model was observed to fit the experimentalvalues of biomass formed, biosurfactant produced, and the paraffins (waxes) degraded satisfactorily. Theenhanced physico-chemical properties of biosurfactant with paraffin substrates, such as high bacterialadherence, wax degrading ability, emulsification activities, and surface tension reducing ability indicatesthe potential of these organisms in addressing oil spill, flow assurance and enhanced oil recoveryprocess.
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Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Pickering emulsion offers potential applications in several fields including oil and gas industry due totheir enhanced stability. Oil-in-water (o/w) emulsions are usually stabilized by surfactant ornanoparticle or by both but show poor thermal stability which limits their use for high-temperatureapplications. In this work, a novel formulation of o/w emulsion stabilized using nanoparticle-surfactantpolymersystem is investigated for the formulation of thermally stable Pickering emulsion. Theconventional oilfield polymer polyacrylamide (PAM), surfactant, sodium dodecylsulfate (SDS), andnanoparticles such as, SiO2, clay, and CuO in varying concentration are used. It is observed that thenanoparticle in the presence of surfactant and polymer synergistically interacted at the oil–waterinterface. The effect of temperature, pH, and salinity on the interfacial tension is investigated tounderstand the thermal stability. The emulsion system with partially hydrophobic clay nanoparticles inthe presence of PAM and SDS shows higher thermal stability as compared to fully hydrophilic SiO2nanoparticles. In the presence of salt, NaCl (1.0 wt%), the thermal stability of clay and SiO2 stabilizedemulsions is observed to be further promoted at higher temperatures. Scanning electron microscopy(SEM) images confirm the existence of a structured and rigid layer of nanoparticle at the oil–waterinterface.
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Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.4
Information on the viscosity of Pickering emulsion is required for their successful application in upstreamoil and gas industry to understand their stability at extreme environment. In this work, a novel formulationof oil-in-water (o/w) Pickering emulsion stabilized using nanoparticle-surfactant-polymer (polyacrylamide)system as formulated in our earlier work (Sharma et al., Journal of Industrial and Engineering Chemistry,2014) is investigated for rheological stability at high pressure and high temperature (HPHT) conditionsusing a controlled-strain rheometer. The nanoparticle (SiO2 and clay) concentration is varied from 1.0 to 5.0wt%. The results are compared with the rheological behavior of simple o/w emulsion stabilized by surfactant-polymer system. Both the emulsions exhibit non-Newtonian shear thinning behavior. A positive shiftin this behavior is observed for surfactant-polymer stabilized emulsion at high pressure conditions. Yieldstress is observed to increase with pressure for surfactant-polymer emulsion. In addition, increase in temperaturehas an adverse effect on the viscosity of emulsion stabilized by surfactant-polymer system. In caseof nanoparticle-surfactant-polymer stabilized o/w emulsion system, the viscosity and yield stress are predominantlyconstant for varying pressure and temperature conditions. The viscosity data for both o/w emulsionsystems are fitted by the Herschel-Bulkley model and found to be satisfactory. In general, the studyindicates that the Pickering emulsion stabilized by nanoparticle-surfactant-polymer system shows improvedand stable rheological properties as compared to conventional emulsion stabilized by surfactant-polymersystem indicating their successful application for HPHT environment in upstream oil and gas industry.
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Effects of crude oil-water emulsions at various water-cut on the performance of the centrifugal pump
Bellary, Sayed A.,Siddique, Md. Hamid,Samad, Abdus,Sangwai, Jitendra S.,Chon, Bohyun Inderscience Enterprises Ltd. 2017 International journal of oil, gas and coal technol Vol.16 No.1
<P>The viscosity of the oil-in-water or water-in-oil depends on the water-cut (WC) present in the system. At a certain WC, the water-crude oil emulsion gives the highest viscosity, showing phase inversion, at which the performance of a centrifugal pump drops. In this article, experimental and analytical investigations have been carried out to study the performance of a centrifugal pump for the crude oil-water emulsion systems prepared by mixing crude oil obtained from an Indian oil field and water. The viscosities of the emulsions having different WC were recorded and a phase inversion point within 60%-70% WC range was obtained. During testing of the pump, emulsion samples were collected and stability of the emulsions was determined. A performance study on the centrifugal pump has been carried out using various samples of the emulsions. The study shows that the increasing WC reduces the pump performance till the phase inversion point. It has been observed that the quality crude oil and the emulsion affect the performance of the centrifugal pump.</P>
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