Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2006-09-19
2006-09-19
Shakeri, Hadi (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057190, C081S057330
Reexamination Certificate
active
07107875
ABSTRACT:
The present invention provides an apparatus that permits sections of tubulars to be connected to or disconnected from a string of pipe during a drilling operation. The apparatus further permits the sections of drill pipe to be rotated and to be axially translated during the connection or disconnection process. The apparatus further allows for the continuous circulation of fluid to and through the tubular string during the makeup or breakout process. The apparatus defines a rig assembly comprising a top drive mechanism, a rotary drive mechanism, and a fluid circulating device. Rotation and axial movement of the tubular string is alternately provided by the top drive and the rotary drive. Additionally, continuous fluid flow into the tubular string is provided through the circulation device and alternately through the tubular section once a connection is made between an upper tubular connected to the top drive mechanism and the tubular string.
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Product Inf
Habetz Jeffrey Michael
Haugen David M.
Patterson & Sheridan L.L.P.
Shakeri Hadi
Weatherford / Lamb, Inc.
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