Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1979-12-17
1981-08-25
Leppink, James A.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
175406, E21C 1700
Patent
active
042854075
ABSTRACT:
For use in a drilling string, the preferred and illustrated embodiment depicts a drill collar to be placed in the lower parts of the drill string for straightening the hole. The preferred embodiment utilizes a generally square drill collar with a thick or heavy wall. It is square in cross section along the greater portion of its length, the four corners being slightly rounded to a specified diameter on rotation, and the four lengthwise corners of the regular cross section are all reinforced with hardfacing material to a specified depth, typically tungsten carbide. The four edges abrade the bore hole as the drill string penetrates the earth. In addition, the lower end of the tubular body includes lengthwise flutes in the form known on a stabilizer to guide the hole straightening device into the hole to be reamed by operation of the device.
REFERENCES:
patent: 1801968 (1931-04-01), Montgomery
patent: 1844371 (1932-02-01), Santiago
patent: 1848128 (1932-03-01), Hinderliter
patent: 3338069 (1967-08-01), Ortloff
patent: 3343615 (1967-09-01), Terry
patent: 3851719 (1974-12-01), Thompson et al.
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