Disjoining pressure and gas condensate coupling in gas condensate reservoirs

Mohammad Mohammadi-Khanaposhtani, Alireza Bahramian, Peyman Pourafshary

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Pore-scale coupled flow of gas and condensate is believed to be the main mechanism for condensate production in low interfacial tension (IFT) gas condensate reservoirs. While coupling enhances condensate flow due to transport of condensate lenses by the gas, it dramatically reduces gas permeability by introducing capillary resistance against gas flow. In this study, a dynamic wetting approach is used to investigate the effect of viscous resistance, IFT and disjoining pressure on pore-scale coupling of gas and condensate. Disjoining pressure arises from van der Waals interactions between gas and solid through thin liquid films, e.g., condensate films on pore walls. Low values of IFT and small pore diameters, as involved in many gas condensate reservoirs, give rise to importance of disjoining pressure. Calculations show that disjoining pressure postpones gas condensate coupling to higher condensate flow fractions-from about 0.08 for vanishing disjoining effect to more than 0.16 for strong disjoining effect. Results also suggest that strong disjoining effect will result in higher gas relative permeability after coupling. Finally, the positive rate effect on gas permeability is only observed when disjoining effects are weak.

Original languageEnglish
Article number042905
JournalJournal of Energy Resources Technology, Transactions of the ASME
Volume136
Issue number4
DOIs
Publication statusPublished - Dec 1 2014

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Keywords

  • disjoining pressure
  • dynamic wetting
  • gas condensate coupling
  • microchannels
  • relative permeability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Mechanical Engineering
  • Geochemistry and Petrology

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