Directional drilling sub

Details Directional drilling sub Directional drilling sub

1977-08-18

1980-09-02

Leppink, James A.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 74, E21B 708, E21B 704

Patent

active

042202140

ABSTRACT:
A directional drilling "sub" provides a shifting end portion which allows the sub to be rotated from a first in-line axially straight orientation with the drill string to a second angled or "bent" position which second position is normally associated with conventional bent "subs" which are permanently structured in the bent position. The device shifts from the first (in-line) position to the second (bent) position upon the application of torsional force thereto which torsional force can be applied, for example, by the actuation of a "turbodrill" (normally attached thereto in operation). The device can be manufactured or machined to provide varying angles to the sub in its bent position to satisfy differing directional drilling situations. The axially aligned first position allows easy entry of the drill string, sub, and turbodrill into the well hole, while the second bend position is used to commence directional drilling. The sub will return gradually to its original axially aligned position when the device is withdrawn from the wellhole, as such position is the path of minimum resistance for the withdrawing drill string and torsion is not present to hold the sub in the bent position.

REFERENCES:
patent: 2336333 (1943-12-01), Zublin
patent: 2680005 (1954-06-01), Storm
patent: 3190374 (1965-06-01), Caperan et al.
patent: 3586116 (1971-06-01), Tiraspolsky et al.
patent: 3667556 (1972-06-01), Henderson
patent: 3679236 (1972-07-01), Warshawsky
patent: 3713500 (1973-01-01), Russell
patent: 4067404 (1978-01-01), Crase
patent: 4077657 (1978-03-01), Trzeciak

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