Surfactant compositions for well cleaning

E - Fixed Constructions – 21 – B

Patent

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E21B 37/06 (2006.01) B01F 17/00 (2006.01) C09K 8/52 (2006.01)

Patent

CA 2388771

A surfactant composition for use in well treatment, particularly for removing oil--based mud deposits from a well prior to cementing, comprises an alkylpolyglucoside in a solution of a mutual solvent for water and hydrocarbon. The composition can be used to formulate a chemical wash by dissolving the composition at a concentration of about 1% - 10% (e.g. 5%) by weight in water or brine.

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