Patent ID: 9051503
Filing Date: 2015-06-09
Classification: C09K

Abstract:
1. A method of developing, exploiting and completing underground mineral oil and natural gas deposits and in deep drillings comprising inserting into a gas or oil well an aqueous composition comprising a hydrophobically associating copolymer, wherein the copolymer comprises (a) at least one monoethylenically unsaturated monomer (a) of the general formula (I) wherein the —(—CH and (b) at least one monoethylenically unsaturated, hydrophilic monomer (b) different from monomer (a), wherein the copolymer is obtained by copolymerization of the monomers (a) and (b) in the presence of at least one surfactant (c), wherein the at least one monomer (b) comprises at least one monomer comprising acidic groups or salts thereof, wherein the at least one surfactant (c) comprises at least one nonionic surfactant.