Concrete core for cementing plugs

Abstract

A well plug, comprising a cylindrical body, a plurality of cylindrical fins encircling the cylindrical body, a concrete core disposed within the cylindrical body and a locking feature disposed in the concrete core and configured to lock with an adjacent well plug.

What is claimed is: 
     
         1 . A well plug, comprising:
 a cylindrical body;   a plurality of cylindrical fins encircling the cylindrical body;   a concrete core disposed within the cylindrical body; and   a locking feature disposed in the concrete core and configured to lock with an adjacent well plug.   
     
     
         2 . The well plug of  claim 1  wherein the locking feature further comprises a plurality of locking sub-features. 
     
     
         3 . The well plug of  claim 1  wherein the locking sub-features comprise a scalloped shape. 
     
     
         4 . The well plug of  claim 1  wherein the locking sub-features comprise eight scalloped shapes disposed around a circumference of a cavity. 
     
     
         5 . The well plug of  claim 1  wherein the locking sub-features comprise an angled feature. 
     
     
         6 . A well plug, comprising:
 a cylindrical body;   a plurality of cylindrical fins encircling the cylindrical body;   a concrete core disposed within the cylindrical body;   a cavity disposed in the concrete core along an axis of the cylindrical body; and   a locking feature disposed at a first end in the concrete core and configured to lock with an adjacent well plug.   
     
     
         7 . The well plug of  claim 6  further comprising a second locking feature disposed at a second end in the concrete core. 
     
     
         8 . The well plug of  claim 6  wherein the locking feature further comprises a plurality of locking sub-features. 
     
     
         9 . The well plug of  claim 6  wherein the locking sub-features comprise a scalloped shape. 
     
     
         10 . The well plug of  claim 6  wherein the locking sub-features comprise eight scalloped shapes disposed around a circumference of a cavity. 
     
     
         11 . The well plug of  claim 6  wherein the locking sub-features comprise an angled feature. 
     
     
         12 . A well plug system, comprising:
 a solid concrete core well plug with a locking feature;   a hollow concrete core well plug with a locking feature; and   wherein the locking feature of the solid concrete core well plug interlocks with the locking feature of the hollow concrete core well plug.   
     
     
         13 . The well plug system of  claim 12  wherein the hollow concrete core well plug comprises a cylindrical body. 
     
     
         14 . The well plug system of  claim 13  wherein the hollow concrete core well plug comprises a plurality of cylindrical fins encircling the cylindrical body. 
     
     
         15 . The well plug system of  claim 13  wherein the hollow concrete core well plug comprises a concrete core disposed within the cylindrical body. 
     
     
         16 . The well plug system of  claim 15  wherein the hollow concrete core well plug comprises a cavity disposed in the concrete core along an axis of the cylindrical body. 
     
     
         17 . The well plug system of  claim 12  wherein the hollow concrete core well plug comprises a second locking feature disposed at a second end in the concrete core. 
     
     
         18 . The well plug system of  claim 12  wherein the locking feature of the solid concrete core well plug and the locking feature of the hollow concrete core well plug each comprise a plurality of locking sub-features. 
     
     
         19 . The well plug system of  claim 18  wherein the locking sub-features comprise a scalloped shape. 
     
     
         20 . The well plug system of  claim 18  wherein the hollow concrete core well plug comprises a rupture disk disposed in a hollow core.