Downhole tubular expansion tool and method

E - Fixed Constructions – 21 – B

Patent

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E21B 43/10 (2006.01)

Patent

CA 2686006

A tool (10) is provided for radially expanding a downhole tubular (C), and includes a central tool mandrel (12), a tubular expander (48) at the lower end of the tubular, and a downhole actuator (15) for forcibly moving the expander axially within the downhole tubular. Slips (20) are positioned for securing the tool within a well, so that the slips may be set, and the tool subsequently stroked to move the expander (48) and radially expand a length of the tubular. Upward pull on the work string may expand long portions of the downhole tubular. Buttress threads (43) preferably support the tubular expander on the downhole tubular when run in the well.

L'invention concerne un outil 10 pour étendre de manière radiale une colonne de forage C, et comprend un mandrin central 12, un dispositif d'expansion de colonne 48 à l'extrémité inférieure de la colonne, et un actionneur de forage 15 pour déplacer à force le dispositif d'expansion axialement à l'intérieur de la colonne de forage. Des coins de retenue 20 sont placés pour fixer l'outil à l'intérieur d'un puits, de telle sorte que les coins de retenue peuvent être fixés, et l'outil soulevé par la suite pour déplacer le dispositif d'expansion 48 et étendre radialement une longueur de la colonne. Une traction vers le haut de la colonne de travail peut étendre des parties longues de la colonne de forage. Des filetages de renfort 43 supportent de préférence le dispositif d'expansion de colonne sur la colonne de forage lorsqu'elle s'étend dans le puits.

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