Isolation Tool and Method

Abstract

An isolation tool and method including a mandrel, a load ring, a large seal, at least two small seals, at least one slip, and a nose cone. The tool may include a slip backup, a level, a groove, at slip segments, a drilled hole, a nut such as a bridge plug nut, an interior flat section, an interior leveled section, and/or gripping material. The isolation tool is preferably a frac plug and the slip is preferably a composite slip.

What is claimed is: 
     
         1 . An isolation tool comprising:
 a mandrel;   a load ring;   a large seal;   at least two small seals, wherein each small seal is adjacent to the large seal;   at least one slip; and   a nose cone.   
     
     
         2 . The isolation tool of  claim 1  wherein the isolation tool is a frac plug. 
     
     
         3 . The isolation tool of  claim 1  wherein the slip is a composite slip. 
     
     
         5 . The isolation tool of  claim 1  further comprising at least one slip backup. 
     
     
         6 . The isolation tool of  claim 1  wherein the slip further comprises at least one level milled into the slip. 
     
     
         7 . The isolation tool of  claim 3  wherein the slip further comprises at least one second relief groove milled into a surface of the slip. 
     
     
         8 . The isolation tool of  claim 1  further comprising a nut selected from the group consisting of a bridge plug nut, a ball drop nut, and a caged ball nut. 
     
     
         9 . The isolation tool of  claim 1  further comprising gripping material. 
     
     
         10 . The isolation tool of  claim 1  wherein the slip comprises at least two segments, wherein each segment further comprises:
 a segment exterior surface; and 
 at least one drilled hole in each segment exterior surface. 
 
     
     
         11 . The isolation tool of  claim 10 , further comprising at least one groove formed in the exterior segment surface. 
     
     
         12 . The isolation tool of  claim 10 , wherein the slip further comprises:
 an interior flat surface section; and   an interior leveled surface section.   
     
     
         13 . The isolation tool of  claim 1 , wherein the slip further comprises drilled shear pin holes. 
     
     
         14 . A method of forming an isolation tool comprising the steps of:
 (a) connecting at least one load ring on a mandrel;   (b) connecting at least one slip adjacent to the load ring;   (c) connecting at least one slip backup adjacent to the slip;   (d) connecting at least one small seal adjacent to the slip backup;   (e) connecting at least one large seal adjacent to the small seal.   
     
     
         15 . The method of  claim 14  further comprising the steps of:
 (f) connecting at least one nose cone. 
 
     
     
         16 . The method of  claim 14  wherein the isolation tool is a frac plug. 
     
     
         17 . The method of  claim 15  further comprising the step of:
 (g) fastening the nose cone in place with a nut. 
 
     
     
         18 . The method of  claim 18  wherein the nut is selected from the group consisting of a bridge plug nut, a ball drop nut, and a caged ball nut. 
     
     
         19 . The method of  claim 14 , wherein the slip in Step (b) is a composite slip. 
     
     
         20 . The method of  claim 14 , further comprising applying gripping material to the slip before Step (b).