Downhole drilling assembly orienting device

Details Downhole drilling assembly orienting device Downhole drilling assembly orienting device

1988-12-07

1990-02-13

Neuder, William P.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 48, 175 61, 175 73, E21B 708

Patent

active

048998338

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 assembly. 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.

REFERENCES:
patent: 3983948 (1976-10-01), Jeter
patent: 4171578 (1979-10-01), Meador
patent: 4220213 (1980-09-01), Hamilton
patent: 4276943 (1981-07-01), Holmes
patent: 4305474 (1981-12-01), Farris et al.
patent: 4319649 (1982-03-01), Jeter
patent: 4465147 (1984-08-01), Feenstra et al.
patent: 4699224 (1987-10-01), Burton
Marshall, "Survey Steering Tool: The Ultimate for Saving Rig Time", SPE 5897, (1976).

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