Wells – Processes – Graveling or filter forming
Patent
1984-03-26
1986-01-28
Novosad, Stephen J.
Wells
Processes
Graveling or filter forming
166 55, 166297, 175 456, E21B 4308, E21B 43116
Patent
active
045665389
ABSTRACT:
The disclosure provides a method and apparatus for effecting the fail-safe perforating of a well casing and gravel packing of the perforated areas of the well casing and the screen with one trip into the well of a combined perforating and gravel packing apparatus which includes packer means and a screen. The gravel packing apparatus provides, in its run-in position in the casing, a continuous annular passage along its entire length, thus permitting fluid pressure to be applied through the casing annulus to a crossover tool and then to the firing mechanism of a perforating gun. The firing mechanism for the perforating gun incorporates a hammer mechanism responsive to fluid pressure supplied from the casing annulus but which will not release until a predetermined level of fluid pressure is applied thereto. If, after the hammer is actuated, the perforating gun fails to fire, the application of a reverse fluid pressure differential to the hammer will effect the retraction of the hammer to its original latched position, ready for a second application of fluid pressure through the casing annulus to release the hammer and again impact the primer to discharge the perforating gun. Following perforating, the gravel packing of the screen and perforations is accomplished by shifting the gravel packing apparatus downwardly and then dropping a ball on a seat to permit fluid pressure to be developed to set a fluid pressure actuated packer.
REFERENCES:
patent: 2760408 (1956-08-01), Taylor
patent: 3040808 (1962-06-01), Schramm et al.
patent: 3800705 (1974-04-01), Tamplen
patent: 4372384 (1983-02-01), Kinney
patent: 4484632 (1984-11-01), Vann
Brochure Entitled "Flopetrol Johnson Tubing Conveyed Perforating Systems" by Schlumberger, Printed Jul. 1983.
Baker Oil Tools, Inc.
Kisliuk Bruce M.
Novosad Stephen J.
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