Treatment plug and method of anchoring a treatment plug and then removing a portion thereof

Abstract

A treatment plug includes, a metal tubular expandable into sealing and anchoring engagement with a surrounding structure, the metal tubular having a shoulder at an inner radial surface thereof, and a composite plug sealable with the metal tubular and anchorable to the shoulder

What is claimed is: 
     
         1 . A treatment plug comprising:
 a metal tubular expandable into sealing and anchoring engagement with a surrounding structure, the metal tubular having a shoulder at an inner radial surface thereof; and   a composite plug sealable with the metal tubular and anchorable to the shoulder.   
     
     
         2 . The treatment plug of  claim 1 , further comprising metal slips positioned radially outwardly of the metal tubular. 
     
     
         3 . The treatment plug of  claim 1 , further comprising polymeric seals positioned radially outwardly of the metal tubular. 
     
     
         4 . The treatment plug of  claim 1 , wherein the metal tubular is radially expandable in response to a swage run therethrough. 
     
     
         5 . The treatment plug of  claim 1 , wherein after the treatment plug has been expanded and the composite plug removed a smallest radial dimension of the treatment plug remaining and defining a through bore is more than 80 percent of a greatest radial dimension of the treatment plug. 
     
     
         6 . The treatment plug of  claim 5 , wherein the smallest radial dimension of the treatment plug is defined by the metal tubular. 
     
     
         7 . The treatment plug of  claim 1 , wherein the composite plug includes no metal. 
     
     
         8 . The treatment plug of  claim 1 , wherein the composite plug is drillably removable from the metal tubular. 
     
     
         9 . The treatment plug of  claim 1 , wherein the composite plug includes a seat that is sealingly receptive to a plug run thereagainst. 
     
     
         10 . The treatment plug of  claim 9 , wherein the treatment plug supports fracing pressures built against a plug sealingly engaged against the seat. 
     
     
         11 . The treatment plug of  claim 9 , wherein the metal tubular and the shoulder are configured to support longitudinal loads generated during swaging of the metal tubular into expanded sealing and anchoring engagement with the surrounding structure. 
     
     
         12 . The treatment plug of  claim 9 , wherein the composite plug is configured to support longitudinal loads generated during swaging of the metal tubular into expanded sealing and anchoring engagement with the surrounding structure. 
     
     
         13 . A method of anchoring a treatment plug and then removing a portion thereof, comprising:
 positioning the treatment plug having a metal tubular with a shoulder engaged with a composite plug within a structure;   swaging the metal tubular into sealing and anchoring engagement with the structure;
 plugging the composite plug; 
 performing a treating operation; and 
 drilling out the composite plug. 
   
     
     
         14 . The method of anchoring the treatment plug and then removing a portion thereof of  claim 13 , wherein the treating operation includes fracing a formation. 
     
     
         15 . The method of anchoring the treatment plug and then removing a portion thereof of  claim 13 , further comprising producing through the metal tubular after drilling out the composite plug. 
     
     
         16 . The method of anchoring the treatment plug and then removing a portion thereof of  claim 13 , further comprising longitudinally compressing the metal tubular between the shoulder and a swaging head during the swaging. 
     
     
         17 . The method of anchoring the treatment plug and then removing a portion thereof of  claim 13 , further comprising attaching a swaging tool to the composite plug. 
     
     
         18 . The method of anchoring the treatment plug and then removing a portion thereof of  claim 13 , further comprising leaving a through bore having a minimum dimension that is more than 80 percent of a greatest dimension of the treatment plug after drilling out the composite plug.