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US 4,226,285 AGranted
Magnetic junk retriever
OwnerMeekie D. Moseley, Jr.inventor
Life of this patent
Estimating the term…
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.
Claims5
A magnetic junk retrieving system for magnetizing a drill bit on the lower end of a drill stem and magnetically insulated therefrom, comprising
- a drilling sub, for connecting a drill bit to the lower end of said drill stem, having a bore extending axially therethrough,
- the drilling sub being of a ferromagnetic material,
- a wire coil positioned around the circumference of the drilling sub, the wire coil being connected at each end thereof to conductor means, and
- contact means connected to said conductor means, extending into the bore of said drilling sub, for contacting a power source when said power source is lowered into the bore of said drilling sub, whereby the coil is energized to create a magnetic force,
- said power source comprising an elongated housing having a bore chamber therein for housing a plurality of batteries, having an upper closed end and a lower closed end, and having a variable capacity for batteries receivable therein, and
- said lower end having means disposed therein for conducting electricity from said batteries to said drilling sub when said housing is in contact with the contact means of said drilling sub.
3 more elements
Dependencies are inferred from the claim text.