The significance of colloidal hydrocarbons in crude oil production. Part 1. New aspects of the stability and rheological properties of water- crude oil emulsions

S. Puskás, J. Balázs, A. Farkas, I. Regdon, O. Berkesi, I. Dékány

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The compositions of paraffinic deposits obtained from oil wells and pipelines were studied. It was established that, besides the well-known asphaltene, malthene, resin and paraffin, a hydrophobic paraffin derivative (solid hydrophobic fraction) of higher molar mass and melting point, containing polar end-groups (C=O and COO-), can also be isolated. X-ray analyses showed this material to be an organocolloid of lamellar structure. Small angle X-ray scattering measurements demonstrated that the substance readily swells in toluene. When its solutions and its suspensions prepared by cooling are studied in aromatic/aliphatic solvent mixtures, they exhibit a great variety of structural characteristics. Optical measurements indicate that its tendency to aggregate is very sensitively affected by the polarity of the hydrocarbon mixture, and by temperature. Its presence at a concentration of 1-2% stabilizes water-in-oil emulsions, which is explained by changes in the colloidal state of the paraffin derivative.

Original languageEnglish
Pages (from-to)279-293
Number of pages15
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume113
Issue number3
DOIs
Publication statusPublished - Aug 10 1996

Keywords

  • Crude oil emulsion
  • Emulsion stability
  • Organocolloids
  • Paraffinic deposits
  • Structure of paraffinic deposits rheology
  • X-ray scattering

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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