Slip retaining system for downhole tools

Details Slip retaining system for downhole tools Slip retaining system for downhole tools

1997-07-07

1998-11-24

Tsay, Frank

Wells

Processes

Placing or shifting well part

166118, 166134, E21B 33129

Patent

active

058395156

ABSTRACT:
Method and apparatus particularly suitable for tools having a center mandrel, a plurality of slip segments disposed in an initial position around the mandrel and requiring a retaining means for holding the slip segments in an initial position prior to setting the tool downhole. The subject retaining system is characterized by at least one frangible retaining band extending at least partially around the slips and at least one elastic O-ring extending at least partially around the slips. Preferably the retaining band is non-metallic and both the retaining band and the elastic O-ring reside in a common groove formed in the outer face of each slip. The groove further preferably has an L-shape due to an under cut in the groove to form a lip extending over the retaining band. Hardened inserts may be molded into the slips. The inserts may be metallic, such as hardened steel, or non-metallic, such as a ceramic material.

REFERENCES:
patent: 2942665 (1960-06-01), Davis
patent: 4349071 (1982-09-01), Fish
patent: 4730670 (1988-03-01), Kim
patent: 5224540 (1993-07-01), Streich et al.
patent: 5271468 (1993-12-01), Streich et al.
patent: 5390737 (1995-02-01), Jacobi et al.
patent: 5540279 (1996-07-01), Branch et al.
patent: 5701959 (1997-12-01), Hushbeck et al.
Halliburton Services--Sales and Service Catalog No. 43, pp. 2561-2562 and pp. 2556-2557.

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