first-contact miscibility

1. n. [Enhanced Oil Recovery]
A condition of two fluids that are miscible that is, they form a single phase when mixed in any proportion when first brought into contact at a given pressure and temperature. In reservoir gasflooding, the injected gas composition, oil composition, temperature and the injection pressure determine the condition of first-contact miscibility. In contrast, fluids that develop miscibility after exchanging components have multiple-contact miscibility.