The present invention relates to the use of polyesters which consist of at least one carbohydrate and at least one carboxylic acid, and mixtures thereof, as a hydraulic fluid.

 
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< Gelled oil with surfactant

> Methods and compositions for improving the thermal stability of aqueous polymeric wellbore treatment fluids

> Dispersions stabilized at temperatures of from 4 to 50 degrees celsius by means of a polymer comprising water-soluble units and units with an LCST

~ 00517