ADDITION OF NONIONIC SURFACTANTS TO WATER SOLUBLE BLOCK COPOLYMERS TO INCREASE THE STABILITY OF THE COPOLYMER IN AQUEOUS SOLUTIONS CONTAINING SALT AND/OR SURFACTANTS

摘要

An aqueous fluid useful for the recovery of crude oil from a subterraneanformation, which includes a compositionincluding a mixture of water, a water soluble block copolymer, an inorganicsalt and at least one member of the group of a nonionicsurfactant having an HLB of less than 12, and methods for using same.