Plug and abandonment system

Abstract

A system to set a plug in a wellbore includes a tubular member and a plug coupled to the tubular member. The plug is configured to seal a wellbore based, at least in part, on a shape change of the plug.

What is claimed is: 
     
         1 . A system for setting a plug in a wellbore, the system comprising:
 a tubular member; and   a plug coupled to the tubular member, wherein the plug is configured to seal a wellbore based, at least in part, on a shape change of the plug.   
     
     
         2 . The system of  claim 1 , wherein the plug is selectively decouplable from the tubular member. 
     
     
         3 . The system of  claim 2 , wherein the plug is selectively decouplable from the tubular member based, at least in part, on a pressure applied via the tubular member. 
     
     
         4 . The system of  claim 1 , wherein the shape change of the plug is based, at least in part, on a pressure applied via the tubular member. 
     
     
         5 . The system of  claim 1 , wherein the plug comprises an axis and is compressible along the axis. 
     
     
         6 . The system of  claim 1 , wherein the shape change of the plug comprises a radial expansion. 
     
     
         7 . The system of  claim 1 , wherein the plug comprises a plurality of layers. 
     
     
         8 . The system of  claim 7 , wherein one or more of the plurality of layers is configured to maintain the plug in an activated state. 
     
     
         9 . The system of  claim 1 , wherein the plug comprises a swellable material. 
     
     
         10 . The plug setting system of  claim 1 , wherein the tubular member is part of a workstring that allows positioning of the plug within the wellbore prior to sealing the wellbore. 
     
     
         11 . A method of setting a plug within a wellbore, the method comprising:
 providing a plug coupled to a tubular member, wherein the plug is configured to seal a wellbore based, at least in part, on a shape change of the plug;   positioning the plug within the wellbore; and   inducing the shape change to seal the wellbore.   
     
     
         12 . The method of setting the plug within the wellbore of  claim 11 , further comprising:
 decoupling the tubular member from the plug.   
     
     
         13 . The method of setting the plug within the wellbore of  claim 12 , wherein the step of decoupling the tubular member from the plug is based, at least in part, on a pressure applied via the tubular member. 
     
     
         14 . The method of setting the plug within the wellbore of  claim 11 , wherein the step of inducing the shape change to seal the wellbore comprises:
 compressing the plug along an axis of the plug.   
     
     
         15 . The method of setting the plug within the wellbore of  claim 11 , wherein the shape change of the plug comprises a radial expansion. 
     
     
         16 . A plug to seal a wellbore, the plug comprising:
 a tubular member;   a layer of compressible material disposed about a portion of the tubular member; and   a moveable member adjacent to the layer of compressible material to axially compress the layer of compressible material;   wherein the layer of compressible material expands radially when compressed axially.   
     
     
         17 . The plug to seal the wellbore of  claim 16 , wherein the moveable member compresses the layer of compressible material based, at least in part, on a pressure applied via the tubular member. 
     
     
         18 . The plug to seal the wellbore of  claim 16 , further comprising:
 a base disposed at a distal end of the layer of compressible material.   
     
     
         19 . The plug to seal the wellbore of  claim 16 , wherein the layer of compressible material is selectively decouplable from a workstring. 
     
     
         20 . The plug to seal the wellbore of claim, further comprising:
 a sleeve configured to maintain the layer of compressible material in a compressed state.