Measuring and testing – Borehole or drilling – During drilling
Reexamination Certificate
2006-06-15
2009-08-11
Williams, Hezron E. (Department: 2856)
Measuring and testing
Borehole or drilling
During drilling
Reexamination Certificate
active
07571643
ABSTRACT:
Aspects of this invention include a rotary steerable steering tool having a sensor arrangement for measuring downhole dynamic conditions. Rotary steerable tools in accordance with this invention include a rotation rate measurement device disposed to measure a difference in rotation rates between a drive shaft and an outer, substantially non-rotating housing. A controller is configured to determine a stick/slip parameter from the rotation rate measurements. Exemplary embodiments may also optionally include a tri-axial accelerometer arrangement deployed in the housing for measuring lateral vibrations and bit bounce. Downhole measurement of stick/slip and other vibration components during drilling advantageously enables corrective measures to be implemented when dangerous dynamic conditions are encountered.
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Chen, D.C.-K, Comeaux, B., Gillespie, G., Irvine, G., and Wiecek, B., “Real-Time Downhole Torsional Vibration Monitor For Improving Tool Performance and Bit Design,” IADC/SPE Drilling Conference, Feb. 21-23, 2006, Miami, Florida, SPE99193.
Fitzgerald John
PathFinder Energy Services, Inc.
Williams Hezron E.
LandOfFree
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