Methods of assessing oil field saturation through use of reactive partitioning tracers

摘要

A family of organic tracers is proposed for single well chemical tracer tests, for example for the measurement of residual oil in petroleum reservoirs. The tracers consist of at least one ester of (hydroxyalkyl) benzoic acid of formula (I), wherein at least one of R₁ to R₅ is a hydroxy alkyl group —R₇—OH and each of the remaining R₁ to R₅ groups is independently selected from H, F, Cl, Br, I, CF₃CF₂Cl, CFCl₂, CCl₃ and at least one of these remaining R₁ to R₅ groups is not H, R₆ is selected from CH₃, C₂H₅, C₃H₇, C₄H₉, CF₃, CH₂CF₃, CCl₃, CH₂CCl₃, CH₂CHCl₂, CH₂CH₂Cl, CH₂CF₃, CH₂CHF₂, CH₂CH₂F, CH₂CH₂CH₂F, CH₂CH₂CHF₂, CH₂CH₂CF₃, CH₂CH₂CH₂Cl, CH₂CH₂CH—Cl₂, CH₂CH₂CCl₃, C₃H₆F, C₃H₅F₂, C₃H₄F₃, C₃H₆Cl, C₃H₅Cl₂, C₃H₅Cl₃ or a halogenated (hydroxymethyl)phenol and R₇ is selected from CH₂, C₂H₄, C₃H₆, C₄H₈.;