Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1985-12-19
1987-09-15
Novosad, Stephen J.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
166 98, 166301, 175 456, E21B 3118
Patent
active
046933085
ABSTRACT:
In a tubing conveyed perforating gun assembly, a detonator is discharged by a weight bar dropped into the tubing string, subject to unintended sticking. The disclosed safety anchor includes a rope socket enabling the safety anchor to be lowered into the tubing string. The safety anchor has an elongate body connected below the rope socket by a shear pin. The body has a mandrel and sleeve construction cooperatively connected with a bottom located grapple cage around collet fingers enabling a fishing neck on the weight bar to be grasped and firmly held. A slip radially expands to lock the safety anchor in the tubing string, enabling the weight bar to be held against falling for safe retrieval.
REFERENCES:
patent: 2287319 (1942-06-01), Miller
patent: 4488597 (1984-12-01), Hoppe et al.
Barker James M.
Luke Robert R.
Beard William J.
Halliburton Company
Melius Terry Lee
Novosad Stephen J.
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