Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1992-10-14
1994-11-01
Britts, Ramon S.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
277129, E21B 2908
Patent
active
053600614
ABSTRACT:
An improved shearing blowout preventer having improved shearing rams for shearing a tubing string extending through the bore of the preventer body. The shear rams include a shear ram having an upper shear blade and a ram having a lower shear blade. The upper shear blade includes a flat surface under the blade with a recess therein for a sealing element and a pair of surfaces spaced apart and below the flat surface under the blade and a tapered conical recess in the rear end of the blade to receive the fish that is sheared and to control the shape of the upper end of the sheared fish. The ram with the lower shear blade includes a tapered conical surface in the center portion of the blade and extending below the cutting edge of the blade. This recess coacts with the recess below the upper shear blade to shape the cut fish so that it does not flatten and to maintain a substantial opening in its upper end without exceeding maximum dimension. The shape of the two tapered conical recesses is such that they will receive a variety of sizes of tubing and function to maintain the opening of the upper end of the lower fish while preventing the transverse dimension from exceeding the preselected maximum dimension.
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Britts Ramon S.
Tsay Frank S.
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