Diamond drill bit with varied cutting elements

Details Diamond drill bit with varied cutting elements Diamond drill bit with varied cutting elements

1990-02-23

1991-12-03

Bui, Thuy M.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, E21B 1050

Patent

active

RE0337579

ABSTRACT:
An earth boring bit utilizing thermally stable polycrystalline diamond material having a row of closely spaced sharp cutting elements, following by a row of widely spaced, blunt or rounded cutting elements, each cutting element extending from a supporting matrix a predetermined amount to allow the sharp cutting elements to form small relief kerfs in a geological formation, after which the blunt or rounded cutting elements dislodge material between the kerfs. Additionally, cylindrical cutting elements are positioned near the gage or outermost portion of the matrix to enhance gage bore cutting.

REFERENCES:
patent: 3709308 (1973-01-01), Rowley et al.
patent: 3747699 (1973-07-01), Feenstra
patent: 3825083 (1974-07-01), Flarity et al.
patent: 3938599 (1976-02-01), Horn
patent: 4098363 (1978-07-01), Rohde
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4225322 (1980-09-01), Knemeyer

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