Surface control bent sub for directional drilling of petroleum w

Details Surface control bent sub for directional drilling of petroleum w Surface control bent sub for directional drilling of petroleum w

1982-04-16

1986-06-24

Novosad, Stephen J.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Sectional guide or shaft having means to lock sections in...

175317, E21B 708

Patent

active

045962944

ABSTRACT:
Directional drilling apparatus for incorporation in a drill string, wherein a lower apparatus section is angularly deviated from vertical by cam action and wherein rotational displacement of the angularly deviated apparatus section is overcome by additional cam action, the apparatus being operated by successive increases and decreases of internal drill string pressure.

REFERENCES:
patent: 2669429 (1954-02-01), Zublin
patent: 2812821 (1957-11-01), Nelson
patent: 3190374 (1965-06-01), Caperan et al.
patent: 3365007 (1968-01-01), Skipper
patent: 3976136 (1976-08-01), Farley et al.
patent: 4220176 (1980-09-01), Russell
patent: 4286676 (1981-09-01), Nguyen
patent: 4303135 (1981-12-01), Benoit
patent: 4374547 (1983-02-01), Nguyen

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