Electrochemical impedance spectroscopy for in situ petroleum analysis and water-in-oil emulsion characterization

Electrochemical impedance spectroscopy for in situ petroleum analysis and water-in-oil emulsion characterization

► Electrochemical impedance spectroscopy for in situ petroleum characterization. ► Electrical properties of oil and water-in-oil emulsion were determined by EIS. ► The resistance increase with the increasing amount of water in the preparation. ► EIS result is consistent with the formation of rigid f...

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Bibliographic Details
Published in:Fuel (Guildford) Vol. 91; no. 1; pp. 224 - 228
Main Authors: Perini, N., Prado, A.R., Sad, C.M.S., Castro, E.V.R., Freitas, M.B.J.G.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-01-2012
Elsevier
Subjects:
Applied sciences
Crude oil
Dehydration
Electrical demulsification
Electrochemical impedance spectroscopy
Electrostatic fields
Emulsions
Energy
Energy. Thermal use of fuels
Equivalent circuits
Exact sciences and technology
Fuels
Heavy oil
Mathematical analysis
Nyquist diagrams
Water-in-oil emulsion
Water-in-oil emulsion
Electrical demulsification
Crude oil
Heavy oil
Electrochemical impedance spectroscopy
Measurement
Water oil emulsion
Nyquist diagram
Oil water emulsion
In situ
Characterization
Preparation
Equivalent circuit
Demulsification
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Summary:► Electrochemical impedance spectroscopy for in situ petroleum characterization. ► Electrical properties of oil and water-in-oil emulsion were determined by EIS. ► The resistance increase with the increasing amount of water in the preparation. ► EIS result is consistent with the formation of rigid films on water–oil interfaces. The measurement of electrochemical impedance spectroscopy used in situ is a suitable technique for the characterization of oil and water-in-oil emulsions. Nyquist diagrams for dehydrated oils are characterized by the formation of one semi-circle. The equivalent circuit proposed for the dehydrated oil is a resistance and capacitor (ROCO) in parallel. The resistance and conductivity of the oil calculated by impedance were 2.96Gohm and 486nSm−1, respectively. Nyquist diagrams for the system composed of water emulsions in oil are mainly characterized by two semi-circles with different relaxation for oil and water-in-oil emulsions. The equivalent circuit is formed by RO and CPEO in parallel and in series with the arrangement of RW/O and CPEW/O in parallel, where RO and CPEO represents the oil, and RW/O and CPEW/O represents water-in-oil emulsions. The resistance of oil (RO) and water-in-oil (RW/O) emulsions increase with the increasing amount of water in the preparation. The increase in resistance shows that the emulsions become more stable with the addition of water. This result is consistent with the formation of rigid films on water–oil interfaces. The impedance measurements were applied to the analysis of the demulsification of the water-in-oil emulsions under an electrostatic field.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2011.06.057