Method for detecting drilling events from measurement while...

Details Method for detecting drilling events from measurement while... Method for detecting drilling events from measurement while...

E - Fixed Constructions

21

B

255/1

E21B 44/00 (2006.01) E21B 12/02 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1313862

METHOD FOR DETECTING DRILLING EVENTS FROM MEASUREMENT WHILE DRILLING SENSORS Abstract Downhole Torque and Rate of Penetration are utilized to develop indications of formations having high porosity or of the development of an undergauge bit. Downhole torque is normalized by dividing it by the product of downhole weight on bit and bit size to produce Dimensionless Torque while Rate of Penetration is normalized by dividing it by the product of downhole weight on bit and rotary speed. The values of Dimensionless Torque and Normalized Rate of Penetration are compared to "normally" expected values of these quantities. Deviations from the normal values are taken as an indication of the occurrence of bit penetration of a highly porous formation or of the development of an undergauge or damaged bit.

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