A method for reaming in the construction of a well

E - Fixed Constructions – 21 – B

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E21B 7/28 (2006.01) E21B 44/02 (2006.01)

Patent

CA 2661851

Methods and systems for controlling movement of a bit of a drilling assembly during reaming of an already- drilled hole; the methods, in certain aspects, including determining a ream speed for downward movement of the bit in the hole, moving the bit downward in a hole at said ream speed, determining a time period for deceleration of the bit to the hole bottom, determining a value for a target drilling parameter for drilling beyond the bottom of the hole, decelerating the bit (linearly or non- linearly) for the time period, and achieving the value for the target drilling parameter when the bit reaches the bottom of the hole .

Procédés et systèmes permettant de commander le mouvement du trépan d'un ensemble de forage lors de l'alésage d'un trou déjà foré. Les procédés, dans certains aspects, comprennent les étapes consistant à déterminer une vitesse d'alésage pour le mouvement descendant du trépan dans le trou, déplacer le trépan suivant un mouvement descendant dans un trou à ladite vitesse d'alésage, déterminer une durée pour la décélération du trépan jusqu'au fond du trou, déterminer une valeur pour un paramètre de forage cible pour le forage au-delà du fond du trou, décélérer le trépan (de manière linéaire ou non linéaire) pendant la durée, et atteindre la valeur du paramètre de forage cible lorsque le trépan atteint le fond du trou.

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