GELLABLE AQUEOUS COMPOSITIONS CONTAINING POLYMERS WITH SPECIAL CHELATING FUNCTIONAL GROUPS USEFUL FOR RECOVERING OIL FROM A OIL FIELD

摘要

Gellable compositions containing: (a) water; (b) a water-soluble organic polymer bearing special chelating functional groups; (c) a multi-valent metal ion capable of causing the polymer to crosslink, are useful to recover oil from a oil field. Said compositions make it possible gels to be obtained which are endowed pith improved physical properties and show a higher stability under the conditions prevailing in the oil field.