Drill rod retrieval device

Details Drill rod retrieval device Drill rod retrieval device

1992-02-05

1992-08-25

Focarino, Margaret A.

Handling: hand and hoist-line implements

Grapple

Well type

294 861, 294 8613, E21B 3120

Patent

active

051412756

ABSTRACT:
A drill rod retrieval device for recovering hollow drill rods that are connectable end to end by coupling means from a drill shaft. The device comprises an internally threaded female section formed within the hollow interior of each of the drill rods and a retrieval member comprising a threaded male member adapted to be inserted down the drill shaft and engaged in the internally theaded female section of an uppermost drill rod. The rod and the retrieval member are threadably engaged one with the other whereupon the retrieval member is removed from the drill shaft with the uppermost drill rod and any additional drill rods connected to the uppermost drill rod.

REFERENCES:
patent: 2305709 (1942-12-01), Johnson
patent: 2912273 (1959-11-01), Chadderdon et al.
patent: 2955655 (1960-10-01), Ware
patent: 3737189 (1973-06-01), Darby
patent: 4681175 (1987-07-01), Bocking et al.

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