Method and apparatus for oscillating a drill string

Details Method and apparatus for oscillating a drill string Method and apparatus for oscillating a drill string

E - Fixed Constructions

21

B

E21B 3/025 (2006.01) E21B 7/24 (2006.01)

Patent

CA 2651154

A method of oscillating a drill string (135) , which method comprises the steps of : (a) rotating said drill string (135) in a first direction until a first limit is reached; and (b) rotating said drill string (135) in a second direction until a second limit is reached; characterised in that said first and second limits are based upon the amount of energy expended during rotation .

L'invention concerne un procédé de mise en oscillation d'un train (135) de tiges. Ledit procédé comprend les étapes consistant à : (a) entraîner en rotation ledit train (135) de tiges dans un premier sens jusqu'à une première limite, et (b) entraîner en rotation ledit train (135) de tiges dans un deuxième sens jusqu'à une deuxième limite ; et est caractérisé en ce que lesdites première et deuxième limites sont fonction de la quantité d'énergie consommée en cours de rotation.

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