Patent ID: 9187685
Filing Date: 2015-11-17
Classification: C09K,E21B

Abstract:
1. A method of repairing voids or fractures in, or adjacent to, a set cement in a wellbore penetrating a subterranean formation, comprising: i. performing a primary cementing operation, wherein a cement slurry is placed in an annulus between a casing string and a wellbore wall; ii. allowing the cement slurry to form the set cement; iii. preparing a sealant composition, wherein the composition is an aqueous slurry of aluminosilicate particles, aluminum compound/silica particle blends, aluminum compound/silicate particle blends, or combinations thereof, wherein the slurry has no cementitious properties in and of itself; iv. performing a remedial operation wherein the sealant composition is pumped into the voids or fractures in the wellbore that are adjacent to the set cement; and v. allowing the sealant composition to react with the set cement, thereby forming a set product in the voids or fractures and forming a seal; wherein the aluminosilicate particles are one or more members selected from the group consisting of kaolin, metakaolin, Class F fly ash, blast furnace slang and zeolites.