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Study in the Eff ect of Naphthenic Acid on the Electrocoalescence of Crude Oil Under High-Frequency Pulsed Electric Field
Abstract
Naphthenic acid (NA) widely exists in acidic crude oil. To reveal the mechanism of electrocoalescence of acidic crude oil
emulsion, the infl uence of NA on the electrocoalescence of W/O emulsion is studied by high-frequency pulsed electrocoalescence
technology and alkali washing method by changing electric fi eld parameters and physical parameters. The results
showed that the desalination (dehydration) rate of W/O emulsion increases with the increase of electric fi eld strength, frequency,
duty ratio, initial water contents and divalent salts. With the increase of monovalent salts, naphthenic acid and alkali
injections, the desalination eff ect decreases. The sodium naphthenate intensifi ed the emulsifi cation eff ect. The presence of
NA reduces the desalination rate. By increasing the concentration of CaCl 2 , the desalination eff ect of acidic crude oil emulsion
is improved. The desalination rate is up to 99.63%, the water content is less than 0.5%, the salt concentration is less
than 3 mg L − 1 , and the acid value is less than 0.03 mgKOH g − 1 . Our studies provide a theoretical basis for high-frequency
pulsed electrocoalescence technology to improve the electrocoalescence and the multiple removal mechanism of inorganic
salts and organic acids of acidic crude oil.
