Protective Sleeve For Expandable Tubulars

Abstract

A protective sleeve for expandable tubulars.

1 . An assembly, comprising: 
 a first tubular member comprising a pin member including external threads;    a second tubular member comprising a box member including internal threads coupled to the external threads of the pin member of the first tubular sleeve; and    an external sleeve coupled to and overlapping with the ends of the first and second tubular members;    wherein the external threads of the pin member of the first tubular member comprise a plurality of spaced apart groups of external threads; wherein the internal threads of the box member of the second tubular member comprise a plurality of spaced apart groups of internal threads; and wherein the external surface end of the pin member of the first tubular member comprises a stress concentrator.    
   
   
       2 . A method for forming a wellbore casing, comprising: 
 positioning the assembly of  claim 1  within a borehole that traverses a subterranean formation; and    radially expanding and plastically deforming the assembly within the borehole.    
   
   
       3 . An apparatus, comprising: 
 a wellbore that traverses a subterranean formation; and    a wellbore casing positioned within and coupled to the wellbore;    wherein the wellbore casing is coupled to the wellbore by a process comprising: 
 positioning the assembly of  claim 1  within the wellbore; and  
 radially expanding and plastically deforming the assembly within the wellbore.  
   
   
   
       4 . A system for forming a wellbore casing, comprising: 
 means for positioning the assembly of  claim 1  within a borehole that traverses a subterranean formation; and    means for radially expanding and plastically deforming the assembly within the borehole.    
   
   
       5 . The assembly of  claim 1  wherein, at least one of: the interface between the first tubular member and the second tubular member, the interface between the first tubular member and the external sleeve, and the interface between the second tubular member and the external provide a fluid tight seal.  
   
   
       6 . The method of  claim 2 , wherein, following the radial expansion and plastic deformation, at least one of: the interface between the first tubular member and the second tubular member, the interface between the first tubular member and the external sleeve, and the interface between the second tubular member and the external provide a fluid tight seal.  
   
   
       7 . The apparatus of  claim 3 , wherein, following the radial expansion and plastic deformation, at least one of: the interface between the first tubular member and the second tubular member, the interface between the first tubular member and the external sleeve, and the interface between the second tubular member and the external provide a fluid tight seal.