Chip relief for rock bits

Details Chip relief for rock bits Chip relief for rock bits

1986-02-24

1987-09-08

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175356, E21B 1018

Patent

active

RE0324957

ABSTRACT:
This invention relates to roller cone, air circulation type rock bits. Means are provided on the rock bit body as well as on the shirttail portion of each of the legs extending from the body to provide a relief to pass rock chips from the borehole bottom and up the drill string as the air circulation roller cone bit works in a formation.

REFERENCES:
patent: 1174576 (1916-03-01), Hughes
patent: 2057026 (1936-10-01), Harrington
patent: 3111179 (1963-11-01), Albers et al.
patent: 3138213 (1964-06-01), Brandon
patent: 3420324 (1969-01-01), Vesper
patent: 4022285 (1977-05-01), Frank
patent: 4372399 (1983-02-01), Cork
Piggot, R. J. S., "Mud Flow in Drilling", Drilling and Production Practices, API (1941), pp. 91-103.
Allen, James H., "How to Relate Bit Weight and Rotary Speed to Bit Hydraulic Horsepower", Drilling DCW, May 1975.
Gray, K. E., "The Cutting Carrying Capacity of Air at Pressure Above Atmospheric", M.S. Thesis, University of Tulsa, Oklahoma, (1957).

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