Effect of gas enrichment and dispersion on nearly miscible displacements in condensing/vaporizing drives

Russell Taylor Johns, J. F. Fayers, F. M. Orr

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

13 Scopus citations

Abstract

Compositional simulation and analytical solutions are presented to show the validity of modeling enriched gas drive processes using only four pseudocomponents. The four-component model is used and compared to a more detailed 12-component model to analyze the effects of dispersion, gas enrichment and pressure on the oil recovery. We show that a simple four-component lumping method gives a model with acceptable average front velocities that exhibits features of both condensing and vaporizing displacements. Furthermore, we show that the four-component model can achieve a nearly exact match to the 12-component model by adjusting the four-component enrichment level. We also compare the dispersion-free analytical four-component solution with a dispersive four-component compositional simulation to demonstrate that dispersion causes some two-phase flow in a displacement that would otherwise be multicontact miscible (MCM). As dispersion increases in both the four and 12-component models, the oil recovery is reduced, especially near the minimum enrichment for miscibility (MME).

Original languageEnglish (US)
Title of host publicationReservoir Engineering
PublisherPubl by Soc of Petroleum Engineers of AIME
Pages865-874
Number of pages10
VolumeSigma
StatePublished - 1992
EventProceedings of the 1992 SPE Annual Technical Conference and Exhibition - Washington, DC, USA
Duration: Oct 4 1992Oct 7 1992

Other

OtherProceedings of the 1992 SPE Annual Technical Conference and Exhibition
CityWashington, DC, USA
Period10/4/9210/7/92

All Science Journal Classification (ASJC) codes

  • Geology
  • Geotechnical Engineering and Engineering Geology

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