Broach for incorporation in a drill string

Details Broach for incorporation in a drill string Broach for incorporation in a drill string

1979-09-10

1981-08-25

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175406, 175410, E21C 1700

Patent

active

042854105

ABSTRACT:
An improved broach is disclosed incorporating, in the preferred and illustrated embodiment, an elongate tubular member constructed in the fashion of a drill collar having a raised external thread cut thereon in helical fashion, the thread having a top face. The thread tapers from the bottom to a maximum diameter at a very gradual rate. The top face includes a generally flat, exposed surface which is reinforced with particulate tungsten carbide. It additionally includes inserts of tungsten carbide at periodic locations as, for example, inserts located at ninety-degree intervals along the thread face. The inserts extend relatively deep and are constructed of a solid block of tungsten carbide in a supportive alloy. Another form has inserts made of cylindrical pellets.

REFERENCES:
patent: 2572839 (1951-10-01), McClinton
patent: 2869828 (1959-01-01), McClinton
patent: 2888845 (1959-06-01), McClinton
patent: 3085639 (1963-04-01), Fitch
patent: 3480094 (1969-11-01), Morris
patent: 3754609 (1973-08-01), Garrett
patent: 3825083 (1974-07-01), O'Dell et al.

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