Theory of multicontact miscible displacement with nitrogen

Birol Dindoruk, Franklin M. Orr, Russell T. Johns

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Solutions obtained by the method of characteristics (MOC) for displacement of mixtures of methane, butane and decane by nitrogen or nitrogen/methane mixtures are used to explain conflicting experimental observations concerning the sensitivity of minimum miscibility pressures to changes in the compositions of an initial oil or the injection gas. The solutions presented show why some investigators have reported weak dependence of the minimum miscibility pressure (MMP) on methane concentrations while others have reported significant sensitivity. The analysis of displacement composition routes indicates that either observation can be correct for some ranges of initial and injection fluid compositions, and shows that the sensitivity behavior depends on the relative positions in composition space of three key tie lines (the initial, injection, and crossover tie lines) with respect to the critical locus.

Original languageEnglish (US)
Pages (from-to)268-278
Number of pages11
JournalSPE Journal
Issue number3
StatePublished - Sep 1997

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology


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