Apparatus for optional straight or directional drilling undergro

Details Apparatus for optional straight or directional drilling undergro Apparatus for optional straight or directional drilling undergro

1986-09-17

1988-04-26

Leppink, James A.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 75, 175 76, 175 92, 175325, E21B 706

Patent

active

047398426

ABSTRACT:
A device for selective straight or directional drilling in subterranean rock formations consists of a rotary drilling tool having a tool main axis and comprising a housing which comprises several sections and can be connected to a drill string, the housing having a down-hole motor for driving a drill bit by means of a driven shaft. For straight drilling, the housing can be set in independent, slow rotation about the tool main axis by being turned by the drill string, and for directional drilling can be aligned and fixed against turning. The lower section of the housing adjacent to the drill bit and mounting the driven shaft is deflected relative to the tool main axis, and this section is connected to an upper section by an intermediate section which has an axis which intersects the axes of the upper and lower section, the device may include a plurality of interchangeable intermediate sections.

REFERENCES:
patent: 3561549 (1971-02-01), Garrison et al.
patent: 3586116 (1971-06-01), Tiraspolsky et al.
patent: 3945446 (1976-03-01), Ostertag et al.
patent: 4067404 (1978-01-01), Crase
patent: 4245709 (1981-01-01), Manuel
patent: 4319649 (1982-03-01), Jeter
patent: 4445578 (1984-05-01), Millheim
patent: 4492276 (1985-01-01), Kamp
patent: 4501336 (1985-02-01), Kemp et al.
patent: 4522272 (1985-06-01), Beimgraben

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