Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1992-08-28
1994-02-22
Britts, Ramon S.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 55, 166 63, E21B 2902
Patent
active
052879240
ABSTRACT:
A system is provided for selectively perforating multiple zones in a well on a single trip into the well. The system includes a tubing string which carries at least a first and a second perforating gun. At least a first and a second pressure actuated firing head are associated with the first and second perforating guns, respectively. A source of actuating fluid pressure for the firing head is provided, which may be the bore of the tubing string. A first selective communication device is provided for isolating the second firing head from the source of actuating fluid pressure until after the first perforating gun has been fired, and for then communicating the second firing head with the source of actuating fluid pressure in response to firing of the first perforating gun. The first firing head provides a time delay during which the actuating fluid pressure may be bled off prior to the firing of the first perforating gun.
REFERENCES:
patent: 3717095 (1973-02-01), Vann
patent: 3830299 (1974-08-01), Thomeer
patent: 4496010 (1985-01-01), Chapman, III
patent: 4612992 (1986-09-01), Vann et al.
patent: 4619333 (1986-10-01), George
patent: 4823875 (1989-04-01), Hill
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patent: 4938286 (1990-07-01), Jennings, Jr.
patent: 4969525 (1990-11-01), George et al.
patent: 5078210 (1992-01-01), George
patent: 5103912 (1992-04-01), Flint
patent: 5115865 (1992-05-01), Carisella et al.
patent: 5161616 (1992-11-01), Colla
Exhibit A-Undated advertising brochure admitted to be prior art illustrating the Vann Systems Time Delayed Firing Head.
Exhibit B-Undated brochure admitted to be prior art illustrating a Vann Systems Differential Firing Head.
Exhibit A-Catalog pp. 22-37 from a Gearhart Company catalog.
Burleson John D.
George Flint R.
Mason Justin L.
Beavers Lucian Wayne
Britts Ramon S.
Druce Tracy W.
Halliburton Company
Tsay Frank S.
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