E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14
E21B 19/00 (2006.01) E21B 19/15 (2006.01)
Patent
CA 1247590
ABSTRACT An oil well drilling rig assembly having a main drilling mast which received and installs sections of drill pipe. A pipe supply mast is pivotally mounted in a spaced relationship from the base of the main mast to provide a safe catwalk area therebetween. The supply mast is movable between a horizontal position for transferring pipe sections between an adjacent pipe supply rack and a vertical position adjacent the main mast for transferring a section of pipe therebetween. The supply mast is raised and lowered by hydraulic cylinders and is telescopically adjustable to various lengths. A combination shock absorbing bumper and alignment arrangement is provided between the mast drill mast and the pipe clamps on the supply mast. The supply mast is provided with a plurality of pipe clamps for releasably clamping a section of pipe on the supply mast. The clamps are provided with adjustable jaws which maintain the axial centerline for clamped pipes of various diameters. The pipe clamps are controlled by pressure actuated cylinders to regulate the clamping pressure in relationship to the thickness and strength of the pipe wall. Pipe sections are transferred individually between a sloped storage rack and the supply mast by indexing wheels. A pair of power drive pickup arms also transfer pipe sections between the storage rack and supply mast.
542488
Davidson Alvin L.
Ridout & Maybee Llp
LandOfFree
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