EMF sacrificial anode sub and method to deter bit balling

Details EMF sacrificial anode sub and method to deter bit balling EMF sacrificial anode sub and method to deter bit balling

1994-07-15

1996-04-23

Tsay, Frank S.

Boring or penetrating the earth

Processes

1753255, 175374, 166902, E21B 700

Patent

active

055094902

ABSTRACT:
A sacrificial anode sub and method are disclosed which provide a lower voltage at the proximately located bit than at the sacrificial anode disposed on sub to thereby deter bit balling. An electromotive force (emf) dynamo is built into the sacrificial anode sub to provide a direct current voltage source for this purpose. Annular insulator electrically insulates sacrificial anode from tubular body. An electrical connection to drill bit is made through threaded lower connector with bit. Impeller rotates in response to drilling fluid flow to rotate the rotor assembly of dynamo.

REFERENCES:
patent: Re29151 (1977-03-01), McCaleb
patent: 1907825 (1933-05-01), Johnson
patent: 3818996 (1974-06-01), McCaleb
patent: 3933203 (1976-01-01), Evans
patent: 4119511 (1978-10-01), Christenson
patent: 4187921 (1980-02-01), Garner
patent: 4624329 (1986-11-01), Evans et al.
patent: 4673044 (1987-06-01), Bigelow et al.
patent: 4856601 (1989-08-01), Raney
patent: 4883132 (1989-11-01), Tibbitts
Society of Petroleum Engineers-1993 (SPE 27638).

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