Fluids for Drilling and maintenance of Wells, which has a higher viscosity under Shear,And Procedure to increase the viscosity of low shear rate the same

摘要

A Drilling fluid and well Maintenance comprises a Brine that has the same Salt dissolved in a selected Group of formate POTASSIUM FORMATECesium formate and mixtures thereof, and a unviscosi ficante BIOPOLYMER derived from amilopectinapregelatinizado Agent, and optionally a Bridge and magnesium oxide.The Derivative of amylopectin Starch is a Starch amylopectin (Waxy) deenlazamiento crossed has sidoentrecru) to the point that the viscosity of a suspension of starch amilopecTina Aqueous experimentaenlazamiento crossed is within about 25% to about 60%, so preferable from approximately 25% less than approxi mately 50%The maximum viscosity can be obtained and gelatinized.A process for Increasing the viscosity at low shear rate temperaturasambiente of Aqueous formate Brine comprising a BIOPOLYMER and add to LASALMUERA Amidon amIlopectina Linking cruzadopregelatinizado in such quantities that they interact synergistically to increase the viscosity of low shear rate LASALMUERA.