Rolling cutter drill bit

Details Rolling cutter drill bit Rolling cutter drill bit

1982-02-03

1987-04-14

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

E21B 1008

Patent

active

046570934

ABSTRACT:
This invention discloses a rolling cone drilling bit having a plurality of cutters which have inserted therein hard metal cutting elements preferably formed of tungsten carbide alloy; and in which bit the rolling cone cutters are located in such a manner that their rotational axes are greatly offset from the rotational axis of the drill bit. In addition, a fluid jetting system is provided in the invention that directs a pressurized fluid spray across the main cutting inserts and against the formation face so that when the drill bit is used in its most advantageous areas, such as the soft, medium-soft and plastic formations, the jetting system prevents "balling up" of the cutters and greatly increases the drilling efficiency of the bit.

REFERENCES:
patent: 2038386 (1936-04-01), Scott et al.
patent: 2147926 (1939-02-01), Scott
patent: 2148372 (1939-02-01), Garfield
patent: 2463932 (1949-03-01), Zublin
patent: 2571930 (1951-10-01), Noble
patent: 3495668 (1970-02-01), Schumacher, Jr.
patent: 3696876 (1972-10-01), Ott
"A Study to Determine the Optimum Bit Offset at Various Drilling Depths", by Terra Tek, Inc.--Oct., 1978-DOE.
"Rotary Drill Bit/Rock Model with Cutter Offset", by E. I. Umez-Eronini.

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