Reducing permeability of highly permeable zones in underground formations.

摘要

High permeability zones in subterranean formations are reduced in permeability by the gelation of water soluble polymers of polyalkylenimines, polyalkylenepolyamines and mixtures thereof in such formations with nonionic polymers which are hydrolyzable to anionic polymers which are capable of cross-linking with and gelling said water soluble polymers.