Compositional simulation including effect of capillary pressure on phase behavior

Mohsen Rezaveisi, Kamy Sepehrnoori, Gary A. Pope, Russell T. Johns

Research output: Chapter in Book/Report/Conference proceedingConference contribution

26 Scopus citations

Abstract

High capillary pressure has a significant effect on the phase behavior of fluid mixtures. The capillary pressure is high in unconventional reservoirs due to the small pores in the rock, so including the effect of capillary pressure on phase behavior is necessary for reliable modeling of unconventional shale gas and tight oil reservoirs. We show that the tangent plane distance method cannot be used to determine phase stability and present a rigorous thermodynamic analysis to determine phase stability with capillary pressure. We then demonstrate that there is a maximum capillary pressure (Pcmax) where capillary equilibrium is possible and derive the necessary equations to obtain this maximum capillary pressure. We also discuss the implementation of the capillary equilibrium in a general purpose compositional reservoir simulator and the numerical challenges involved with its application to unconventional reservoirs. Three simulation case studies for gas condensate and tight oil reservoirs were performed to illustrate the influence of capillary pressure on production behavior. These results clarify the influence of capillary pressure on production behavior in low-permeability reservoirs. We show that the choice of the capillary pressure function and parameters significantly affects the results.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2015
PublisherSociety of Petroleum Engineers (SPE)
Pages6090-6126
Number of pages37
ISBN (Electronic)9781510813229
StatePublished - 2015
EventSPE Annual Technical Conference and Exhibition, ATCE 2015 - Houston, United States
Duration: Sep 28 2015Sep 30 2015

Publication series

NameProceedings - SPE Annual Technical Conference and Exhibition
Volume2015-January

Other

OtherSPE Annual Technical Conference and Exhibition, ATCE 2015
CountryUnited States
CityHouston
Period9/28/159/30/15

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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  • Cite this

    Rezaveisi, M., Sepehrnoori, K., Pope, G. A., & Johns, R. T. (2015). Compositional simulation including effect of capillary pressure on phase behavior. In Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2015 (pp. 6090-6126). (Proceedings - SPE Annual Technical Conference and Exhibition; Vol. 2015-January). Society of Petroleum Engineers (SPE).