Patent ID: 9321955
Filing Date: 2016-04-26
CPC Classification: C09K,E21B

Claim Text:
1. A method of selecting a composition for treating an oil or gas well having a wellbore, comprising: determining whether displacement of residual aqueous treatment fluid by formation crude oil or displacement of residual aqueous treatment fluid by formation gas is preferentially stimulated for the oil or gas well having a wellbore; and selecting an emulsion or a microemulsion for injection into the wellbore to increase formation crude oil or formation gas production by the well, wherein the emulsion or the microemulsion comprises water, a first type of solvent, a second type of solvent and a surfactant, wherein the first type of solvent and the second type of solvent are different and are selected from the group consisting of cyclic or acyclic, branched or unbranched alkanes having 8 carbon atoms and substituted with only an —OH group and aromatic solvents having a boiling point between about 175-300° F., when displacement of residual aqueous treatment fluid by formation gas is preferentially stimulated.