Downhole drilling assembly orienting device

Details Downhole drilling assembly orienting device Downhole drilling assembly orienting device

E - Fixed Constructions

21

B

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E21B 7/08 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 21/10 (2006.01) E21B 47/024 (2006.01) E21B 47/09 (2006.01)

Patent

CA 1312072

ABSTRACT The orientation of a downhole steering assembly used in drilling a horizontal well is located with respect to the earth using a sub placed above the downhole assem- bly. The sub comprises a housing having a central bore defining an inlet flow passageway said housing further defining a toroidal chamber in communication with said passageway. The toroidal chamber has a pocket, a valve seat, and a spherical valve that is rotatable in said toroidal chamber from a normally seated position in the pocket. Upon rotation of the drill string the spherical valve plugs the valve seat and causes an increase in the resistance to flow in the drilling mud through the drill string that can be detected at the surface.

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