Patent ID: 6698519
Filing Date: 2004-03-02
Classification: C04B,C09K,E21B

Abstract:
A method of forming a permeable sand screen in a long, open hole well bore within a fluid producing zone comprising the steps of:(a) placing a perforated pipe containing a plurality of openings around and along the length thereof in said open hole well bore adjacent to said fluid producing zone, said perforated pipe having an external diameter smaller than the diameter of said open hole well bore; (b) providing a hardenable composition which after being placed in a desired location cures into a hard mass; said hardenable composition comprising a hydraulic cement composition, a particulate cross-linked aqueous gel having a size in the range of from about 100 to about 3,000 microns containing an internal temperature activated breaker, a particulate dehydrated cross-linked aqueous gel having a size in the range of from about 40 to about 500 microns containing an internal temperature activated breaker, and water present in an amount sufficient to form a slurry; (c) placing said hardenable composition in said well bore adjacent to said fluid producing zone within the interior of said perforated pipe therein, between said perforated pipe and the walls of said open hole well bore and within voids or fractures in said producing zone; (d) causing said hardenable composition to cure into a hard permeable mass; (e) causing said gel having a size in the range of from about 100 to about 3,000 microns and said gel having a size in the range of from about 40 to about 500 microns to break into liquid and said cured cement composition to be permeated; and (f) drilling said hard permeable mass out of the interior of said perforated pipe.