GRAVEL PACK FLUID COMPOSITION AND EMULSION THEREFOR

摘要

A gravel pack composition comprising i) a water-in-oil emulsion comprising: a) an organic continuous phase comprising 0.1 to 5 vol% of the emulsion of non-ionic or cationic surfactant and 0.25 to 3 vol% of the emulsion of sorbitan ester; b) a dispersed aqueous phase comprising 0.05 to 3 vol% of the emulsion of a partial ester of a polyol with at least one C6 to C22 fatty acid and at least one of an acid, acid precursor, and a chelating agent; and c) a density control agent; and ii) gravel. The fluid can display a delayed break of up to about 72 hours to enable clean-up of mud cake.