Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1993-03-16
1994-03-15
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 551, 166376, 166377, E21B 43116
Patent
active
052939405
ABSTRACT:
An automatic tubing release mechanism is adapted to be disposed in a wellbore between a tubing, on one end, and a perforating gun, on the other end. The release mechanism includes a frangible breakup tube, firing head positioned above the breakup tube, and the perforating gun positioned below the breakup tube when the release mechanism is disposed in the wellbore. A detonating cord is interconnected between the firing head and the perforating gun via the breakup tube. When the firing head detonates the perforating gun, the breakup tube shatters. When the breakup tube shatters: in accordance with one embodiment, a release piston, previously resting on the breakup tube, moves downwardly in response to hydrostatic pressure of wellbore fluid and releases a collet arm which rests against a threaded connection of a housing, the release of the collet arm disconnecting the perforating gun from the tubing, the perforating gun falling to a bottom of the wellbore; or, in accordance with another embodiment, wellbore fluid at hydrostatic pressure enters a plurality of fluid ports and exerts a pressure on an underside of a release piston causing the piston to move upwardly thereby releasing a collet arm which rests against a threaded connection of a housing, the release of the collet arm disconnecting the perforating gun from the tubing, the perforating gun falling to a bottom of the wellbore.
REFERENCES:
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P. B-4 from Vann Systems catalogue, entitled "Mechanical Release Firer (MRF)," wherein, the releasing device will drop the guns when the guns detonate.
A drawing entitled "33/8" Gun Drop Firing Head," wherein, the collet moves off a shoulder when a piston moves in response to detonation of a perforating gun; no frangible tube is disclosed here.
One page from an NL McCullough catalogue, disclosing "Mechanical Firing Head with Automatic Release," wherein, following detonation, bottom hole pressure forces a release sleeve upwardly thereby allowing collets to collapse and release the gun.
Two pages from Schlumberger Maintenance Manual, entitled "Automatic Gun Release Firing Head," wherein, pressure builds shearing shear pins releasing the gun.
One page from a brochure of Baker Sand Control Perforating Systems related to and entitled "Gun Releases," illustrating Mechanical Gun Release Sub, Hydraulic Gun Release Sub, and Automatic-Release Mechanical Firing Head.
One page from a brochure of Compac, entitled "Automatic Disconnect," wherein pressure from detonation of explosive train shifts the piston and releases the collet fingers allowing the guns to drop.
Two pages from Vann Systems catalogue, entitled "Automatic Release (AR)," wherein, the gun is released when it detonates.
Hromas Joe C.
Huber Klaus B.
Miszewski Antoni K. L.
Bouchard John H.
Dang Hoang C.
Garrana Henry N.
Schlumberger Technology Corporation
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