E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/34
E21B 7/02 (2006.01)
Patent
CA 1198411
IMPROVED DRILLING APPARATUS ABSTRACT OF THE DISCLOSURE A drill rig having a drill rig mast and a transfer arm is described. The clamps of the transfer arm are resiliently mounted to the transfer arm so as to provide limited axial movement of the clamps and thereby of a clamped downhole tubular. This resilient support for the downhole tubular serves to reduce damage to the threaded ends of the tubular during tubular handling operations. In addition, the clamps of the transfer arm are provided with resilient clamping surfaces which serve to engage the clamped tubular frictionally, without gouging or deeply scratching the surface thereof. A pair of automatic, self centering, hydraulic tongs is provided for making up and breaking out threaded connections of tubulars having various diameters without manual adjustment of the tongs. In an alternate embodiment, a swivel sub of variable effective length operates to provide similar advantages. Furthermore a novel mounting arrangement for tongs is described.
434212
Meredith & Finlayson
Walker-Neer Manufacturing Co. Inc.
LandOfFree
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