Patent ID: 6321595
Filing Date: 2001-11-27
Classification: B09C,E21B,G01N

Abstract:
A method for determining a composition of nonaqueous phase liquid located in a subsurface formation and consisting of a known number n, where n is two or more, of major organic species, comprising:(A) introducing one or more non-partitioning tracers and at least n partitioning tracers into one or more injection points located in the subsurface formation;(B) measuring separation between the one or more non-partitioning tracers and the at least n partitioning tracers from one or more sampling points; and(C) comparing the measured separation with a reference separation of the one or more non-partitioning tracers and the at least n partitioning tracers when contacted with nonaqueous phase liquids of known composition to determine the mole fraction of at least one major organic species of the nonaqueous phase liquid in the subsurface formation.