Patent ID: 6702044
Filing Date: 2004-03-09
Classification: C09K,Y10S

Abstract:
A method of consolidating unconsolidated weak zones or formations formed of clays, shale and sand stone while drilling a well bore penetrating the zones or formations to prevent sloughing comprising drilling said well bore with a drilling fluid having a pH in the range of from about 6 to about 10 and comprised of water, a polymeric cationic catalyst capable of accepting and donating protons which is adsorbed on said unconsolidated clays, shale and sand stone, a water soluble or dispersible polymer which is capable of being cross-linked by a thermoset resin and causing said resin to be hard and tough when cured and a water soluble or dispersible thermoset resin which cross-links said polymer, is catalyzed and cured by said catalyst and consolidates said weak zones or formations so that sloughing is prevented.