Rotary bit with ridges

Details Rotary bit with ridges Rotary bit with ridges

1977-09-23

1978-09-26

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175391, 175410, E21B 936

Patent

active

041162897

ABSTRACT:
To allow the bit to drill in formations that behave plastically, while also protecting the bit against overloading when entering a relatively soft formation, ridge-shaped elements are provided having the ridges within the rotation alloy symmetric surface defined by the scraping edges of the scraping means (natural or artificial diamonds). The flanks of the elements are positioned at an acute angle to the said surface.

REFERENCES:
patent: 2365941 (1944-12-01), Crake
patent: 2558415 (1951-06-01), Bonsall
patent: 2855181 (1958-10-01), Olsen
patent: 3003570 (1961-10-01), Roland
patent: 3153458 (1964-10-01), Short
patent: 3181632 (1965-05-01), Raynal
patent: 3191698 (1965-06-01), Short
patent: 3747699 (1973-07-01), Feenstra et al.
patent: 3753597 (1973-08-01), French
patent: 3881561 (1975-05-01), Pols et al.
Drilling, Jan. 1977, pp. 73 and 74.

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