Magnetic junk retriever

Details Magnetic junk retriever Magnetic junk retriever

1979-02-12

1980-10-07

Purser, Ernest R.

Wells

With electrical means

175 93, 175328, E21B 4300

Patent

active

042262852

ABSTRACT:
An improved magnetic junk retriever arranged to magnetize a drill bit just prior to its removal from the bottom of the well bore. A wound, electromagnet subassembly is connected between the drill bit and the drill collar. A battery-pack tool is used to energize the electromagnet by lowering the tool through the bore of the drill pipe and collars to contact pins projecting into the bore of the sub. Energizing the electromagnet causes the drill bit to be magnetized.

REFERENCES:
patent: 474297 (1892-05-01), Hoffmann
patent: 2339274 (1944-01-01), Kotnny
patent: 2569390 (1951-09-01), Sewell
patent: 2595632 (1952-05-01), Bivings et al.
patent: 2650067 (1953-08-01), Martin
patent: 2709104 (1955-05-01), Gibbs
patent: 2721726 (1955-10-01), Johnson
patent: 3047795 (1962-07-01), Pearson

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