Patent ID: 6218343
Filing Date: 2001-04-17
Classification: C09K,Y10S

Abstract:
A method for plugging a tubing/casing annulus formed between a casing and a tube internal to the casing in a wellbore in fluid communication with a subterranean hydrocarbon-bearing formation, the method comprising:(a) providing a tubing/casing annulus plug additive comprising a dry mixture of water soluble crosslinkable polymer, a crosslinking agent, and a reinforcing material selected from among fibers and comminuted plant materials, wherein the dry mixture will upon contact with water or an aqueous solution form a gelation solution;(b) contacting the tubing/casing annulus plug additive with water or an aqueous solution to form a tubing/casing annulus plug fluid;(c) injecting the tubing/casing annulus plug fluid into the annulus; and(d) crosslinking said fluid to substantial completion in said annulus to substantially plug said annulus.