Gyroscopic steering tool using only a two-axis rate...

Details Gyroscopic steering tool using only a two-axis rate... Gyroscopic steering tool using only a two-axis rate...

2007-06-26

2007-06-26

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

C175S061000, C033S313000, C702S009000

Reexamination Certificate

active

10911921

ABSTRACT:
A two-axis gyroscope used on a bottom hole assembly can be used for determining a rate of rotation about the rotational axis of a BHA. The method takes advantage of possible misalignment of at least one axis of the two axis gyroscope from orthogonality with respect to the rotational axis of the BHA, resulting in the misaligned gyro being sensitive to BHA rotation.

REFERENCES:
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patent: 6668465 (2003-12-01), Noureldin et al.
patent: 7080460 (2006-07-01), Illfelder
patent: 2002/0133958 (2002-09-01), Noureldin et al.

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