E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01) E21B 12/00 (2006.01) E21B 21/08 (2006.01) E21B 25/00 (2006.01)
Patent
CA 2124265
-22- ABSTRACT OF THE DISCLOSURE A drill string having a core sampling device at its lower end is suspended in an earth borehole by a rotary drilling rig at the earth's surface. Drilling fluid pulsations are monitored in the drilling fluid standpipe to generate characteristic signatures of normal coring operations and a precursor, abnormal, signature when the core sampling device first begins to jam, before catastrophic jamming has occurred. Responsive to the abnormal signature, remedial action is commenced, such as reducing WOB, RPM, or terminating the coring operation. The system is also used to determine that an activatable downhole tool has one or more of its parts moved from a first position to a second position.
Marsh Laban M.
Rao M. Vikram
Wilson Bobby T.
Baroid Technology Inc.
Kirby Eades Gale Baker
LandOfFree
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