Drilling fluid

Details Drilling fluid Drilling fluid

C - Chemistry, Metallurgy

09

K

C09K 8/22 (2006.01) C07H 15/04 (2006.01) C09K 8/08 (2006.01)

Patent

CA 2229593

A water-based drilling fluid (WBM) comprises as additive a reaction product of a polyhydroxyalkane and alkylene oxide. The polyhydroxyalkane is desirably based on a monosaccharide, and is preferably sorbitol. The alkylene oxide may comprise ethylene oxide (EO), propylene oxide (PO) and/or butylene oxide (BO). Good results have been obtained with additives including Sorbitol + 18EO, Sorbitol + 9P0, Sorbitol + 4EO + 6BO, Sorbitol + 6EO + 6BO, or Sorbitol + 6BO. Drilling fluids in accordance with the invention have been found in laboratory tests to exhibit improved shale inhibition properties as compared with known polyol containing WBM, particularly in the absence of added potassium ions. This is enviromnentally advantageous.

Un fluide de forage à base d'eau comprend en tant qu'additif un produit de réaction d'un polyhydroxyalcane et d'un oxyde d'alkylène. Le polyhydroxyalcane est préférablement à base d'un monosaccharide, idéalement du sorbitol. L'oxyde d'alkylène peut comprendre de l'oxyde d'éthylène (EO), de l'oxyde de propylène (PO) et/ou de l'oxyde de butylène (BO). On a obtenu de bons résultats avec des additifs comprenant du Sorbitol + 18EO, du Sorbitol + 9PO, du sorbitol + 4EO + 6BO, du Sorbitol + 6EO + 6BO, ou du Sorbitol + 6BO. Il s'est avéré dans des essais en laboratoire que des fluides de forage selon l'invention présentent des propriétés d'inhibition des schistes supérieures à celles des fluides de forage à base d'eau connus et contenant un polyol, notamment en l'absence d'ions potassium ajoutés, ce qui est avantageux pour l'environnement.

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