E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01)
Patent
CA 2745198
A method of damping stick-slip oscillations in a drill string, which method comprises the steps of: (a) damping said stick-slip oscillations using a drilling mechanism at the top of said drill string; and (b) controlling the speed of rotation of said drilling mechanism using a PI controller; characterised by the step of (c) tuning said PI controller so that said drilling mechanism absorbs most torsional energy from said drill string at a frequency that is at or near a frequency of said stick-slip oscillations.
L'invention porte sur un procédé d'amortissement d'oscillations de glissement saccadé dans un train de tiges de forage, lequel procédé consiste à : (a) amortir lesdites oscillations de glissement saccadé à l'aide d'un mécanisme de forage au niveau du sommet dudit train de tiges de forage; et (b) commander la vitesse de rotation dudit mécanisme de forage à l'aide d'un dispositif de commande de type proportionnel-intégral; lequel procédé est caractérisé par l'étape consistant à (c) régler ledit dispositif de commande de type proportionnel-intégral de telle sorte que ledit mécanisme de forage absorbe la plus grande partie de l'énergie de torsion du train de tiges de forage à une fréquence qui est la fréquence desdites oscillations de glissement saccadé ou qui est proche de celle-ci.
Mcfadden Fincham
National Oilwell Varco L.p.
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