| 主权项 |
1. A method for making downhole dynamics measurements in a drill string, the method comprising:
(a) rotating a downhole navigational sensor set in a borehole, the navigational sensor set deployed in the drill string and including at least first, second, and third tri-axial accelerometers; (b) causing the navigational sensor set to obtain a string of accelerometer measurements, the string of accelerometer measurements including a plurality of tri-axial accelerometer measurements made at a predetermined measurement interval; (c) differentiating the string of accelerometer measurements obtained in (b) to obtain a corresponding string of differentiated accelerometer measurements; (d) causing a downhole processor to process the differentiated accelerometer measurements obtained in (c) to obtain a drill string vibration parameter; (e) causing the downhole processor to further process the drill string vibration parameter obtained in (d) so as to remove at least one of a gravitational acceleration component, a tangential acceleration component, and a centripetal acceleration component to obtain a corrected drill string vibration parameter; and (f) implementing one or more corrective measures based on the corrected drill string vibration parameter, wherein the corrective measures comprise the step of adjusting a dynamic drilling condition, the dynamic drilling condition comprising axial vibration, lateral shock, lateral vibration, torsional vibration and/or stick/slip. |
