Interpretation of Swelling/Extraction Tests

Summary This paper describes an experimental and theoretical investigation of the relationship between the phase behavior observed in swelling/extraction tests and either slim-tube-determined minimum miscibility pressure (MMP) or critical gas enrichment. The results indicate that no simple relationship exists between the phase behavior observed in the tests and either MMP or critical gas enrichment. It is concluded that the primary value of swelling/extraction tests is that they provide phase-behavior data that can be used to calibrate equation-of-state (EOS) models, which, when used with 1D compositional simulators to model slim-tube displacements, provide realistic estimates for MMP and critical gas enrichment.