Surface controlled bent sub for directional drilling of...

Details Surface controlled bent sub for directional drilling of... Surface controlled bent sub for directional drilling of...

E - Fixed Constructions

21

B

255/6

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 23/00 (2006.01)

Patent

CA 1217182

Abstract of the Disclosure 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 de- viated apparatus section is overcome by additional cam action, the apparatus being operated by successive in- creases and decreases of internal drill string pressure.

422094

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