Boring or penetrating the earth – Wedging slip assembly for supporting a pipe or rod
Reexamination Certificate
2007-11-13
2007-11-13
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Wedging slip assembly for supporting a pipe or rod
C166S077530, C166S382000, C166S078100
Reexamination Certificate
active
10799511
ABSTRACT:
This invention relates to a mechanical apparatus for gripping and manipulating tubular members, such as drill pipe. The apparatus is essentially an automated slip puller, which generally comprises a slip base, a pulling mechanism pivotally attached to the slip base, and at least one cylinder or spring attached to the pulling mechanism. The entire apparatus is releasably connected to a rotary table located over a borehole. In a typical well drilling operation, the automated slip puller is attached to a slip assembly, which is thereafter placed around a drill pipe and positioned in the rotary table bushing. When the automated slip puller is activated, the pulling mechanism removes the slip assembly from the rotary table bushing and from around the drill pipe, thereby allowing the drill pipe to be manipulated in or out of the well bore. During operation, no portion of the automated slip puller is located outside the boundary of the rotary table.
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Article entitled “Pipe Handling Equipment Air-operated Power Slip” by Blohm & Voss Repair GmbH, Hamburg, Germany, dated Aug. 2003.
Article entitled “Access BackSaver” by Access Oil Tools, Broussard, LA.
Bagnell David
Fuller Robert E
Howrey LLP
National-Oilwell L.P.
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