NOVEL GELS COMPOSITIONS AND THEIR USE FOR SELECTIVE REDUCTION OF WATER PERMEABILITY IN HOT AND SALT TANKS.

摘要

The invention relates to novel crosslinking compositions for water-soluble polymers having sulfonic acid functional groups or their salts and the assisted recovery method using them. The gelled compositions comprise at least one water-soluble complex of a polyvalent metal cation chosen from Ti, Zr and Hf, such as sodium and zirconium lactate capable of crosslinking a copolymer having the following composition: BR/ (CF) DRAWING IN BOPI) wherein R = H, alkyl, cycloalkyl or aralkyl, S = SO 3 M, CO NH C (CH 3) 2 CH SO 3 M, CH 2 SO 3 M or phenyl SO 3 M , BR/ M = alkali or alkaline earth ion. BR/ The aqueous gels obtained are used preferentially for the selective reduction of water permeability in hot and salty reservoirs. / P