| 摘要 |
There is disclosed an aqueous wellbore fluid having a water-soluble carbohydrate additive comprising a monosaccharide component, an oligosaccharide component, or a mixture thereof, the carbohydrate component 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. Most preferably, the carbohydrate additive is a concentrated water-soluble extract of a naturally derived material such as sugar cane, sugar beet or malted grain. The wellbore fluid described have excellent shale inhibitive properties. |
