Wellhead shearing apparatus

Details Wellhead shearing apparatus Wellhead shearing apparatus

1980-10-15

1982-07-27

Novosad, Stephen J.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

72464, 83694, 251 1A, E21B 2908, E21B 3306

Patent

active

043412645

ABSTRACT:
A wellhead shearing apparatus suitable for use on oil and gas wells having hydrogen sulfide. The apparatus includes a body with a vertical bore and opposed guideways extending from the bore. A ram assembly with two rams, means for moving each ram in the guideways together with the bore for shearing pipe in the bore and apart for other well operations. One ram has an upper cutting blade and the other ram has a lower cutting blade, which has a hard metal insert providing its cutting edge and the upper cutting blade has a hard cutting edge. The rams are of steel having a maximum hardness of 24 to 26 Rockwell C and the insert has substantially greater hardness. The hard cutting edges of both blades are isolated from the sour gas when the blades are under stress as a result of sealing across the vertical bore.

REFERENCES:
patent: 3736982 (1973-06-01), Vujasinovic
patent: 3834764 (1974-09-01), Krekeler
patent: 3888027 (1975-06-01), Toews
patent: 3946806 (1976-03-01), Meynier
patent: 4081027 (1978-03-01), Nguyen
patent: 4240503 (1980-12-01), Holt, Jr. et al.

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