Patent ID: 6672388
Filing Date: 2004-01-06
Classification: C09K,Y10S

Abstract:
A process for cleaning a wellbore wall, tubing or casing using a turbulent flow regime characterized by:a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivative of an alkylpolyglycoside, from 35% to 80% by weight of an alkylpolyglycoside and from 5% to 25% by weight of an anionic derivative of a fatty alcohol, their balance being 100%; b) diluting the aqueous surfactant composition in water to form a diluted aqueous surfactant composition and injecting the diluted aqueous surfactant composition into a wellbore containing drilling mud, oily residues or other undesirable deposits; c) extracting from the wellbore the diluted aqueous surfactant composition containing the drilling mud, oily residues or other undesirable deposits; and d) removing the drilling mud, oily residues or other undesirable deposits from the diluted aqueous surfactant composition.