Method of determining the rotational orientation of a downhole t

Details Method of determining the rotational orientation of a downhole t Method of determining the rotational orientation of a downhole t

1990-10-04

1992-04-14

Bagnell, David J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 48, 175 61, E21B 706, E21B 2108

Patent

active

051039192

ABSTRACT:
A method of determining the rotational orientation of a downhole tool on a rotatable conduit, such as a collar on a drillstring in a borehole, without interrupting the rotation of the drillstring, includes establishing the initial rotational orientation of the downhole tool; creating a pressure change to generate a signal; providing a reference point on the conduit; generating a reference signal each time the reference point rotates past a detector; generating the signal each time the conduit rotates through the defined rotational orientation with respect to the tool; and timing and comparing the occurrences of the referenced signal and the signal in order to monitor the rotational orientation of the downhole tool.

REFERENCES:
patent: 2142559 (1939-01-01), Duus
patent: 3718194 (1973-02-01), Hering et al.
patent: 4596293 (1986-06-01), Wallussek et al.
patent: 4699224 (1987-10-01), Burton
patent: 4899833 (1990-02-01), Warren et al.
patent: 4948925 (1990-08-01), Winters et al.

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