Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1987-02-06
1988-10-11
Dang, Hoang C.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
166377, 175 456, E21B 2304, E21B 43116
Patent
active
047763930
ABSTRACT:
Perforating gun automatic release mechanism wherein the perforating gun is linked to the drilling string by a coupling member. The coupling member includes a plurality of collet fingers, by which said coupling member is attached to the drilling string. The heads of the collet fingers, when inserted into the bottom of the drilling string engage a circumferential groove therein. A slidable locking sleeve, coaxially disposed within the coupling member prevents the inward radial movement necessary for the collet finger heads to disengage the groove. The locking sleeve sits on a slidable piston, which is contained inside the coupling member on top of the explosive charge which detonates the perforating gun. Upon detonation, the resulting shock wave traveling upward pushes the piston and locking sleeve to a position where the collet finger heads are free to disengage the groove, which the weight of the perforating gun then causes, dropping the gun, coupling member and all attachments away from the drilling string.
REFERENCES:
patent: 4484639 (1984-11-01), Ayero
patent: 4526233 (1985-07-01), Stout
patent: 4554981 (1985-11-01), Davies
patent: 4601492 (1986-07-01), George
Forehand Donald R.
Murray Max M.
Ricles Thomas D.
Turney Robert A.
Chauza Roger N.
Dang Hoang C.
Dresser Industries Inc.
Peoples William R.
Selinger Jerry R.
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