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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

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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1. A method of well treatment comprising the step of circulating a well treatment solution through a well before placement of a cement slurry therein, wherein the well treatment solution comprises a surfactant composition comprising at least one linear or branched chain C6-C10alkylpolyglucoside in a

1. A method of well treatment comprising the step of circulating a well treatment solution through a well before placement of a cement slurry therein, wherein the well treatment solution comprises a surfactant composition comprising at least one linear or branched chain C6-C10alkylpolyglucoside in a solution of a mutual solvent selected from the group consisting of isopropyl myristate and rapeseed methyl ester. 2. A method as claimed in claim 1, wherein the well has been drilled using an oil-based drilling fluid. 3. A method as claimed in claim 1, wherein the surfactant composition comprises a single alkylpolyglucoside. 4. A method as claimed in claim 1, wherein the surfactant composition comprises more than one alkylpolyglucoside. 5. A method as claimed in claim 1, wherein the alkylpolyglucoside is selected from the group consisting of a C8-C10linear alkylpolyglucoside, a C8-C10branched chain alkylpolyglucoside, a C8branched chain alkylpolyglucoside, a linear C6alkylpolyglucoside, and combinations thereof. 6. A method as claimed in claim 1, wherein the ratio of alkylpolyglucoside to mutual solvent is in the range 1:3 to 3:1. 7. A method as claimed in claim 1, wherein the well treatment solution also comprises water. 8. A method as claimed in claim 7, wherein the water comprises sea water. 9. A method as claimed in claim 7, wherein the water comprises brine. 10. A method as claimed in claim 7, wherein the surfactant composition is present in the well treatment solution in an amount of 1%-10% by weight. 11. A method as claimed in claim 10, wherein the surfactant composition is present in the well treatment solution in an amount of about 5% by weight.