Wells – Processes – Assembling well part
Reexamination Certificate
2006-04-29
2008-09-02
Gay, Jennifer H (Department: 3672)
Wells
Processes
Assembling well part
C166S077100, C175S423000
Reexamination Certificate
active
07419008
ABSTRACT:
A power slip that utilizes modified SDXL slips and regular drilling bowls that fits to the pin drive master bushings of the rotary table and utilizes the depth of the drive pin holes as part of the actuators, thus allowing the power slip to set lower for added clearance and safety during drilling operations. Cables are anchored to a base plate and slip linkages and slip connectors are pivotally mounted to the slips and to the top plate so that, when the lift cylinders are actuated, the slips are moved to the released position. This two-stage linkage and cable design maximizes the movement of the slip assemblies while minimizing vertical movement of the power slip's housing. The base plate of the power slip is provided with a plurality of tubular pins adapted for mounting the base plate to the pin master bushing of a rotary table, and a portion of the lift cylinder is positioned in the interior hollow pins to maximize the movement of the slip assemblies upon actuation of the lift cylinders while minimizing the vertical dimension of the power slip.
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Den-Con Tools 2006-2007 Catalog (Den-Con Tool Company, Oklahoma City, OK)), publication date unknown.
Brochure entitled “PS-15 and PS-20 Spring Slip Assemblies,” Varco Oil Tools/Varco International, Inc., Houston, TX, 1981.
Bertelsen Jeffrey L.
Campisi Frank J.
Gay Jennifer H
Hutchins Cathleen R
Wisner Mark R.
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