Method and apparatus for determining drill string movement mode

Details Method and apparatus for determining drill string movement mode Method and apparatus for determining drill string movement mode

2006-11-28

2006-11-28

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

With bit wear signal generating

C175S045000, C166S066000, C166S250010

Reexamination Certificate

active

07140452

ABSTRACT:
A method for determining movement mode in a drill string includes measuring lateral acceleration of the drill string, determining lateral position of the drill string from the acceleration measurements, and determining mode from the position with respect to time. Also disclosed is a method including measuring drill string acceleration along at least one direction, spectrally analyzing the acceleration, and determining existence of a particular mode from the spectral analysis. Also disclosed is a method for determining destructive torque on a BHA including measuring angular acceleration at at least one location along the BHA, and comparing the acceleration to a selected threshold. The threshold relates to a moment of inertia of components of the BHA and a maximum torque applicable to threaded connections between BHA components. A warning is generated when acceleration exceeds the threshold.

REFERENCES:
patent: 5205163 (1993-04-01), Sananikone
patent: 5402677 (1995-04-01), Paslay et al.

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