Method and system for detecting the precession of an element of

Details Method and system for detecting the precession of an element of Method and system for detecting the precession of an element of

1998-06-24

1999-12-07

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system

Orientation or position

702 6, 702 9, 7315243, E21B 4700

Patent

active

059998911

ABSTRACT:
The present invention relates to a system and to a method for automatic detection of the precession of an element of a drill string, in particular of the bottomhole assembly of a drill string. The method comprises a stage of surface acquisition of signals linked with the vibration of the end of the drillpipes, automatic processing on at least one signal in order to detect a jump in average and a significant line in the spectrum of the signal. A precession criterion is calculated and an alarm is set off. The invention further relates to a system for detecting the precession of an element of a drill string.

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Vandiver, "Case Studies of the Bending Vibration and Whirling Motion of Dril Collars", SPE/IADC Drilling Conference, Paper SPE 18652, Feb. 2-Mar. 3, 1989, New Orleans, pp. 282-290, Dec. 1990.
Zhang et al., "Precession of Rotary Drillstrings Should be Eliminated", SPE Advanced Tech. Series, Paper SPE 19360, 3(1):23-28, May 1995.
Henneuse, "Surface Detection of Vibrations and Drilling Omptimization: Field Experience", IADC/SPE Drilling Conference, Paper SPE 23888, Feb. 18-21, 1992, New Orleans, pp. 409-423.
I Rey-Fabret et al., "Detecting Whirling Behaviour of the Drill String from Surface Measurements", SPE Annual Technical Conference and Exhibition, Paper SPE 38587, Oct. 5-8, 1997, pp. 223-231.

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