COMPOSITIONS AND METHODS FOR DELIVERING AN ORGANIC SOLVENT TO A DOWNHOLE PORTION OF A WELLBORE OR PIPELINE

摘要

A composition is provided for delivering an organic solvent to a downhole portion of a wellbore or pipeline. The composition comprises: (A) water; (B) a weighting agent; (C) an organic solvent that is immiscible with water; and (D) a surfactant adapted for forming an oil- external emulsion of the organic solvent and the water, wherein the surfactant is unstable to hydrolysis. The composition is formed to be an oil-external emulsion. The density of the composition is formulated to be greater than that of pure water at standard temperature and pressure. A method is provided for delivering an organic solvent to a downhole portion of a wellbore. The method comprises the steps of: (A) forming a composition according to the invention; and (B) introducing the composition into the wellbore or pipeline.