Removable plug arrangement and method of removing a plug arrangement

Abstract

A removable plug arrangement includes at least one plug configured to lead or follow a hardenable material that is pumped through a tubular, the plug has one or more portions made of a material configured to weaken when exposed to an activation fluid.

What is claimed is: 
     
         1 . A removable plug arrangement comprising at least one plug configured to lead or follow a hardenable material being pumped through a tubular, the plug having one or more portions made of a material configured to weaken when exposed to an activation fluid. 
     
     
         2 . The removable plug arrangement of  claim 1 , wherein the material is a controlled electrolytic metallic material. 
     
     
         3 . The removable plug arrangement of  claim 1 , wherein the at least one plug also includes a seal configured to flexibly sealingly engage walls of the tubular while moving therethrough. 
     
     
         4 . The removable plug arrangement of  claim 1 , wherein the at least one plug includes a plurality of plugs. 
     
     
         5 . The removable plug arrangement of  claim 4 , wherein the plurality of plugs includes at least one plug leading the hardenable material and at least one plug following the cement. 
     
     
         6 . The removable plug arrangement of  claim 5 , wherein the at least one plug leading the hardenable material includes two plugs, a first of the two plugs being sealingly attachable to plug a port through a second of the two plugs when engaged therewith. 
     
     
         7 . The removable plug arrangement of  claim 6 , wherein the second of the two plugs is sized and configured to sealingly engage walls of a tubular having a larger diameter than a tubular that the first of the two plugs is sized and configured to sealingly engage walls of. 
     
     
         8 . The removable plug arrangement of  claim 5 , wherein the at least one plug following the hardenable material includes two plugs, a first of the two plugs being sealingly attachable to plug a port through a second of the two plugs when engaged therewith. 
     
     
         9 . The removable plug arrangement of  claim 8 , wherein the second of the two plugs is sized and configured to sealingly engage walls of a tubular having a larger diameter than a tubular that the first of the two plugs is sized and configured to sealingly engage walls of. 
     
     
         10 . The removable plug arrangement of  claim 1 , wherein the at least weakening of the one or more portions includes substantially dissolving the one or more portions. 
     
     
         11 . The removable plug arrangement of  claim 1 , wherein the at least one plug has at least one bore configured to facilitate expose or portions of the one or more portions to the activation fluid. 
     
     
         12 . The removable plug arrangement of  claim 1 , wherein the material is configured to weaken significantly after exposure to the activation fluid in about a few hours to about a few days. 
     
     
         13 . The removable plug arrangement of  claim 1 , wherein the hardenable material is cement. 
     
     
         14 . A method of removing a plug arrangement comprising:
 exposing one or more portions of at least one cementing plug to an activation fluid capable of weakening the one or more portions;   weakening the one or more portions; and   drilling or milling through the weakened one or more portions.   
     
     
         15 . The method of removing a plug arrangement of  claim 14 , further comprising dissolving the one or more portions with the activation fluid. 
     
     
         16 . A removable plug arrangement comprising:
 a volume of hardenable material; and   at least one plug configured to lead or follow the volume of hardenable material being pumped through a tubular, the plug having one or more portions made of a material configured to weaken in response to being exposed to an activation fluid.