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...

2007-04-12

2010-10-12

Feliciano, Eliseo Ramos (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C702S011000, C702S094000, C702S099000

Reexamination Certificate

active

07813878

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: 6529834 (2003-03-01), Estes et al.
patent: 2001/0041963 (2001-11-01), Estes et al.
patent: 2372640 (2000-01-01), None
Algrain;Determination of 3-D angular rates using two-axis measurements, SPIE, vol. 2468, pp. 252-260, 8 Figs.

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