Method of freeing stuck drill pipe

Details Method of freeing stuck drill pipe Method of freeing stuck drill pipe

E - Fixed Constructions

21

B

E21B 31/00 (2006.01) E21B 7/24 (2006.01)

Patent

CA 2469166

An auxiliary method for freeing a drill pipe stuck due to build up of filter cake, which provides a reduction in the amount of force required to free said pipe which comprises: a) Lowering an ultrasonic horn type device down the drill pipe to the point of contact between said drill pipe and mud filter cake; b) Producing ultrasonic energy at the point of contact until the contact area is sufficiently reduced such that substantially less force is required to free the pipe.

Procédé auxiliaire destiné à la libération d'une tige de forage coincée par la formation d'un gâteau de sédiments, qui permet de réduire la quantité de force nécessaire pour libérer ladite tige. Ledit procédé consiste (a) à faire descendre un dispositif de type émetteur d'ultrasons dans la tige de forage jusqu'au point de contact entre ladite tige et le gâteau de sédiments et (b) à produire une énergie ultrasonore au point de contact jusqu'à ce que la zone de contact soit suffisamment réduite pour entraîner une réduction considérable de la force nécessaire pour libérer la tige.

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