Patent ID: 6848519
Filing Date: 2005-02-01
Classification: C09K,Y10S

Abstract:
1. A method of forming a chemical casing while drilling through a zone or formation comprising drilling with a drilling fluid having a pH in the range of from about 6 to about 10 and that comprises water, a water soluble or water dispersible polymer which is capable of being cross-linked by a thermoset resin and causing the resin to be hard and tough when cured, a particulate curable solid thermoset resin and a water soluble or dispersible thermoset resin that cross-link the polymer, and a delayed dispersible acid-catalyst for curing the solid thermoset resin and the water soluble thermoset resin, whereby the drilling fluid forms a filter cake on the walls of the zone or formation that cures into a hard and tough cross-linked chemical casing thereon.