Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1985-06-06
1986-10-14
Novosad, Stephen J.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
166297, 175 456, E21B 43116
Patent
active
046167013
ABSTRACT:
A well perforating apparatus includes an underbalancing valve for opening ports in a tubing string immediately subsequent to the firing of a perforating gun, and comprises a hollow conduit having at least one pair of axially aligned, and radial holes traversing the wall of the conduit. A frangible member has its end portions slidably and sealably mounted in such holes and is therefore disposed transversely to the path of a detonating bar which is dropped to initiate the firing of the perforating gun. Upon breakage of the frangible member, the ends of the bar are forced inwardly out of the holes by the fluid pressure differential existing between the interior and exterior of the conduit due to the underbalanced fluid pressure condition achieved in the tubing string prior to firing the perforating gun.
REFERENCES:
patent: 4299287 (1981-11-01), Vann et al.
patent: 4375240 (1983-03-01), Baugh et al.
patent: 4393929 (1983-07-01), Akkerman
patent: 4512406 (1985-04-01), Vann et al.
patent: 4538680 (1985-09-01), Brieger et al.
Myers, Jr. William D.
Stout Gregg W.
Baker Oil Tools, Inc.
Bui Thuy M.
Novosad Stephen J.
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