Rotary steerable tool including drill string rotation...

Details Rotary steerable tool including drill string rotation... Rotary steerable tool including drill string rotation...

2005-11-14

2008-09-23

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Automatic control

In response to drilling fluid circulation

C175S045000, C175S061000

Reexamination Certificate

active

07426967

ABSTRACT:
Aspects of this invention include a downhole tool (such as a steering tool) including first and second sensor sets for measuring substantially instantaneous drill string rotation rates. Each of the sensor sets includes at least one accelerometer disposed to measure cross-axial acceleration components. Embodiments of this invention advantageously enable gravitational and tool shock/vibration acceleration components to be cancelled out, thereby improving accuracy. Moreover, exemplary embodiments of this enable stick/slip conditions to be detected and accommodated.

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