US2009321067A1PendingUtilityA1

Releasing slips for oil well tool

21
Individually held — no corporate assignee on recordPriority: Jun 27, 2008Filed: Jun 27, 2008Published: Dec 31, 2009
Est. expiryJun 27, 2028(~1.9 yrs left)· nominal 20-yr term from priority
Inventors:Albert E. KlineGeorge W. Paschen
E21B 33/129E21B 33/134
21
PatentIndex Score
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Cited by
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References
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Claims

Abstract

Releasing slips for use with a downhole tool, a tool for deploying downhole in a well utilizing the releasing slips and a well in which a downhole tool is deployed utilizing the releasing slips of the invention is described herein. The tool has a plurality of slips for selective engagement with a wall of a wellbore. The slips include releasing slips and biting slips. The releasing slips have a low friction surface, e.g., a substantially smooth surface for engaging the wall of the wellbore. The smooth wall engaging face of the releasing slips facilitate easy release of the slips, thereby facilitating easy removal of the downhole tool. The slips may include a plurality of hardened members that protrude from the wall engaging face of the releasing slips to reduce wear on the face of the releasing slip.

Claims

exact text as granted — not AI-modified
1 . A well comprising:
 a wellbore having a wall;   a tool adapted for lowering into said wellbore, said tool having a plurality of slips for selective engagement with said wall;   wherein said slips include releasing and biting slips; and   wherein said releasing slips have a low friction wall engaging surface for engaging said wall.   
   
   
       2 . The well according to  claim 1  wherein:
 said low friction wall engaging surface is substantially smooth.   
   
   
       3 . The well according to  claim 1  wherein:
 said low friction wall engaging surface is comprised of a plurality of hardened members for engaging said wall.   
   
   
       4 . The well according to  claim 1  wherein:
 said tool is a hold down tool.   
   
   
       5 . The well according to  claim 1  wherein:
 said tool is a packer.   
   
   
       6 . The well according to  claim 1  wherein:
 said tool is a bridge plug.   
   
   
       7 . The well according to  claim 1  wherein:
 said releasing slips are located over less than half of a circumference of said tool.   
   
   
       8 . The well according to  claim 1  wherein:
 said slips comprise two releasing slips and four biting slips.   
   
   
       9 . The well according to  claim 1  wherein:
 said releasing slips are wider than said biting slips.   
   
   
       10 . A tool for lowering into a wellbore, said tool comprising:
 a body;   a cone member slidable in a longitudinal direction along a length of said tool body for selective engagement with said plurality of slips for forcing slips outwards;   a plurality of slips affixed to said body;   wherein said slips include releasing and biting slips;   wherein said biting slips have a gripping surface; and   wherein said releasing slips have a low friction wall engaging surface.   
   
   
       11 . The tool according to  claim 10  wherein:
 said low friction wall engaging surface is substantially smooth.   
   
   
       12 . The tool according to  claim 10  wherein:
 said low friction wall engaging surface comprises a plurality of hardened members for engaging said wall.   
   
   
       13 . The tool according to  claim 10  wherein:
 said tool is a hold down tool.   
   
   
       14 . The tool according to  claim 10  wherein:
 said tool is a packer.   
   
   
       15 . The tool according to  claim 10  wherein:
 said tool is a bridge plug.   
   
   
       16 . The tool according to  claim 10  wherein:
 said releasing slips are located over less than half of a circumference of said tool.   
   
   
       17 . The tool according to  claim 10  wherein:
 said slips comprise two releasing slips and four biting slips.   
   
   
       18 . The tool according to  claim 10  wherein:
 said releasing slips are wider than said biting slips.   
   
   
       19 . A releasing slip for use in a tool for lowering into a wellbore, said slip comprising:
 a body;   an extension extending upwardly from said body; and   a low friction wall engaging face on said body to facilitate easy release.   
   
   
       20 . The releasing slip according to  claim 19  wherein:
 said low friction wall engaging face is substantially smooth.   
   
   
       21 . The releasing slip according to  claim 19  wherein:
 said low friction well engaging face further comprises a hardened member protruding from said face for reducing wear of said low friction wall engaging face.

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