METHOD AND COMPOSITION FOR EXTRACTING HYDROCARBON FLUIDS OUT OF UNDERGROUND FORMATION Russian patent published in 2010 - IPC C08G73/02 C09K8/508 E21B43/22 

FIELD: oil and gas production.

SUBSTANCE: method of modifying water permeability of underground formation consists in pumping water composition into underground formation. Water composition contains 0.005-2 wt % of poly-hydroxietheramine, replaced with alkyleleneoxide or its salt, where the said poly-hydroxietheramine is produced by interaction of diepoxide out of group containing of diglycidile ethers of polyatomic phenol with one or several amines containing two reaction-capable atoms of hydrogen and not necessary by interaction of thus produced polyhydroxietheramine with acid or alkylation agent of formula R₁₄X, where: R₁₄ - C₁-C₄ alkyl and X are halogen, sulphate or sulphanol with formation of salt. Water composition contains 0.005-2 wt % of the above said water soluble polyhydroxietheramine or its salt and 0.005-2 wt % of listed solvents. The invention is developed in dependant claims of formula.

EFFECT: reduced contents of water in products, raised efficiency of extraction of oil out of formation.

25 cl, 4 tbl, 2 ex