VISCOELASTIC CATIONIC COMPOSITIONS OF ETHERS Russian patent published in 2011 - IPC C08L1/00 C08L3/00 C08L5/00 C09K8/08 C09K8/90 C09K8/54 

FIELD: chemistry.

SUBSTANCE: invention relates to a viscoelastic composition for thickening, forming gels and for use as a surfactant. The composition contains water in amount not less than approximately 7% of the total weight of the composition, at least one inorganic salt in amount ranging from approximately 0.5 to approximately less than 15% of the total weight of the composition, at least one cationic carboydrate ether for regulating viscoelasticity of the composition. The inorganic salt is selected from a group comprising sodium chloride, potassium chloride, ammonium chloride, calcium chloride, sodium bromide, calcium bromide, zinc bromide, calcium formate, caesium chloride, caesium bromide and combinations thereof. The cationic carbohydrate ether contains one or more cationic fragments and one or more carbohydrate fragments bonded to one or more linking fragments through an ether bond. The linking fragment is selected from a group comprising an oxygen atom which forms an ether bond between two carbohydrate fragments, hydrocarbyl groups, and substituted hydrocarbyl groups. The cationic fragment contains one or more quaternary ammonium groups. The cationic carbohydrate ether contains at least one hydrophilic fragment. The hydrophilic fragment is chemically bonded to the substitute on the cationic fragment or the linking fragment through an ester, carboxamide or carboxamidine functional group.

EFFECT: invention can be used in well fluids for extracting hydrocarbons, which increases efficiency, lowers loss of fluid and increases the return of expensive and sometimes toxic metal salts.

19 cl, 18 dwg, 1 tbl, 13 ex