Stand alone compression packer

Abstract

A stand-alone packer has a compressible packer element having an upper end and a lower end disposed about a packer body. A setting sleeve is disposed about the packer body above the compressible packer element. A packer stop having a flat annular upper face is positioned on the packer body below the compressible packer element and a sliding sleeve is disposed in the packer body and detachably connected to the setting sleeve.

What is claimed is: 
     
         1 . A downhole tool comprising:
 a packer body;   a compressible packer element having an upper end and a lower end disposed about the packer body;   a setting sleeve disposed about the packer body above the compressible packer element;   a packer stop having a flat annular upper face positioned on the packer body below the compressible packer element; and   a sliding sleeve disposed in the packer body and detachably connected to the setting sleeve.   
     
     
         2 . The downhole tool of  claim 1  further comprising:
 an upper anti-extrusion element capturing an upper end of the compressible packer element and having a portion thereof disposed between the setting sleeve and the packer body; and 
 a lower anti-extrusion element capturing a lower end of the compressible packer element and having a portion thereof disposed between the packer stop and the packer body. 
 
     
     
         3 . The downhole tool of  claim 1 , the setting sleeve movable from a first to a second position on the packer body to urge the second end of the packer element against the flat annular upper face of the packer stop. 
     
     
         4 . The downhole tool of  claim 1 , the sliding sleeve movable in the packer body to move the setting sleeve from a first to a second position, the setting sleeve being movable therewith, wherein the compressible packer element is squeezed between the setting sleeve and the packer stop to expand the packer element radially outwardly to engage the wellbore. 
     
     
         5 . The downhole tool of  claim 4 , the sliding sleeve being detachable from the setting sleeve and movable longitudinally relative thereto to a third position in the packer body. 
     
     
         6 . The downhole tool of  claim 3  further comprising a plurality of locking elements disposed in grooves in the setting sleeve and movable therewith, the packer body having a plurality of grooves defined in an outer surface thereof, the plurality of locking elements being received in the grooves in the packer body to lock the setting sleeve in the second position. 
     
     
         7 . The downhole tool of  claim 6 , further comprising a biasing element engaging the locking elements and urging the locking elements into the grooves in the packer body. 
     
     
         8 . The downhole tool of  claim 4 , the sliding sleeve defining a plug seat for receiving a setting plug, the sliding sleeve movable in the packer body as a result of pressure applied in the packer body above the setting sleeve. 
     
     
         9 . A downhole tool comprising:
 a tubular body connected in a casing string for use in a wellbore, the tubular body and wellbore defining an annulus therebetween;   a radially expandable compression packer element disposed about the tubular body;   a packer stop having a flat annular upper face disposed about the tubular body and adjacent a lower end of the compression packer element; and   a setting sleeve disposed about the tubular body adjacent an upper end of the packer element wherein the compression packer element expands outwardly to engage the wellbore as a result of compression resulting from movement of the setting sleeve from a first to a second position on the tubular body, the tubular body being isolated from the annulus such that no communication from a central flow passage of the tubular body to the annulus is possible therethrough prior to or after the compression packer element is expanded outwardly to engage the wellbore.   
     
     
         10 . The downhole tool of  claim 9 , the setting sleeve comprising a generally cylindrical body with upper and lower ends, the lower end defining a flat annular surface adjacent the upper end of the compression packer element. 
     
     
         11 . The downhole tool of  claim 9 , further comprising an upper anti-extrusion ring capturing an upper end of the compression packer element, a portion of the anti-extrusion ring being trapped between the setting sleeve and the tubular body to prevent the packer element from intruding between the setting sleeve and the tubular body. 
     
     
         12 . The downhole tool of  claim 11 , further comprising a lower anti-extrusion ring capturing a lower end of the packer element, a portion of the lower anti-extrusion ring positioned between the packer stop and the tubular body to prevent the packer element from intruding between the packer stop and the tubular body. 
     
     
         13 . The downhole tool of  claim 9  further comprising a sliding sleeve disposed in the tubular body and a plurality of frangible connectors connecting the sliding sleeve to the setting sleeve. 
     
     
         14 . The downhole tool of  claim 13 , the frangible connector comprising a shearable drive pin. 
     
     
         15 . The downhole tool of  claim 9  further comprising a plurality of retaining rings movable with the setting sleeve, the tubular body defining a plurality of grooves for receiving the retaining rings in the second position of the setting sleeve. 
     
     
         16 . A downhole tool comprising:
 a tubular body;   a packer element having upper and lower faces;   a packer stop disposed about the tubular body having a flat annular upper face;   a setting sleeve having a flat annular lower face and being movable from a first to a second position on the tubular body;   an upper anti-extrusion element at the upper end of the packer element; and   a lower anti-extrusion element of the lower end of the packer element, wherein the packer element is squeezed between the setting sleeve flat annular lower face and the flat annular upper face of the packer stop to expand the packer element radially outwardly to engage a wellbore when the setting sleeve moves to the second position.   
     
     
         17 . The downhole tool of  claim 16  further comprising a sliding sleeve disposed in the tubular body and detachably connected to the setting sleeve. 
     
     
         18 . The downhole tool of embodiment 17, wherein the setting sleeve is movable downwardly with the sliding sleeve. 
     
     
         19 . The downhole tool of  claim 16 , wherein the upper anti-extrusion element has a portion thereof that extends into a space between the setting sleeve and the tubular body. 
     
     
         20 . The downhole tool of  claim 16  further comprising a plurality of lock rings movable with the setting sleeve and receivable in grooves in the tubular body in the second position of the setting sleeve.