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1. CA2066165 - FLUIDE POUR PUITS DE FORAGE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims
1. An aqueous inhibitive wellbore fluid being substantially free from any oil component and having water-soluble carbohydrate additive which is a water soluble extract of naturally derived material having a high proportion of monosaccharides and/or oligosaccharides, said carbohydrate additive being employed in an amount sufficient to provide at least 10% by weight of the monosaccharide/oligosaccharide component in the aqueous phase of the fluid.
2. A water-based wellbore fluid according to Claim 1, wherein the water-soluble carbohydrate additive is chosen from: (a) a water-soluble extract of sugar cane; (b) a water-soluble extract of sugar beet; (c) a water-soluble extract of malted grain; and (d) a mixture of two of more of the above.
3. A water-based wellbore fluid according to Claim 2, wherein the water soluble extract is a molasses extract of sugar cane or sugar beet or a malt extract.
4. A water-based wellbore fluid according to Claim 2, wherein the water soluble carbohydrate additive is chosen from sugar cane molasses, sugar beet molasses, condensed molasses solubles or a mixure of two or more thereof.
5. A wellbore fluid according to any preceding claim, wherein the carbohydrate additive is employed in an amount sufficient to provide at least 16% by weight of the monosaccharide/oligosaccharide component in the aqueous phase of the fluid.
6. A wellbore fluid according to any preceding claim,
wherein the carbohydrate additive is employed in an amount sufficient to provide at least 22% by weight of the monosaccharide/oligosaccharide component in the aqueous phase of the fluid.
7. A wellbore fluid according to any preceding claim, further including a filtration reducer.
8. A wellbore fluid according to Claim 7, wherein the filtration reducer is used in an amount sufficient to reduce substantially the amount of aqueous phase of the wellbore fluid lost to the formation during use.
9. A wellbore fluid according to Claim 7 or 8, wherein the filtration reducer is used in an amount of at least 0.2% by weight/volume.
10. A method of drilling a wellbore in which a wellbore fluid according to any one of the preceding claims is employed.
11. The use of water soluble extract of a naturally derived material having a high proportion of monosaccharides and/or oligosaccharides, as an additive for an aqueous wellbore fluid, substantially free from any oil component, to improve the shale inhibition properties of the fluid.