Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1993-12-08
1995-03-28
Neuder, William P.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 55, 251 13, 285922, E21B 2908
Patent
active
054008573
ABSTRACT:
A ram assembly for positioning within a through bore of a blowout preventer body includes first and second opposing ram pistons each powering a respective knife blade. Each knife blade may have a pair of angled shear edges on opposite sides of the respective ram centerline, with each pair of angled shear edges defining a generally V-shaped configuration. The pair of opposing knife edges preferably engage the oilfield tubular at four contact points spaced substantially equidistant about a circumference of the tubular, and thereby contain the tubular for the shearing operation. According to the method of the present invention, the oilfield tubular is sheared substantially by brittle shearing rather than ductile shearing. By containing the tubular prior to shearing, the body of a shearing assembly may have a bore only slightly greater than the diameter of tubular to be sheared, thereby significantly reducing the costs and increasing the versatility of the shearing equipment, and also reducing the cost of the blowout preventer and the associated wellhead stack.
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O'Donnell David L.
Whitby Melvyn F.
Neuder William P.
Varco Shaffer, Inc.
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