Reverse section milling method and apparatus

E - Fixed Constructions – 21 – B

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E21B 29/00 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2468729

A method and apparatus for milling a section of casing in an upward direction, utilizing a downhole hydraulic thrusting mechanism for pulling a section mill upwardly. A downhole motor and torque anchor can be used to rotate the section mill, or the mill can be rotated by a work string. A stabilizer above the section mill can be used to stabilize the mill relative to the casing being milled. A spiral auger below the section mill can be used to move the cuttings downwardly.

L'invention concerne un procédé et un appareil servant à fraiser une section de tubage dans un mouvement ascendant qui font intervenir un système de poussée hydraulique fond-de-trou pour tirer une fraise de section vers le haut. La fraise de section peut être entraînée en rotation par un moteur fond-de-trou et une ancre à couple, ou par une colonne de travail. Un stabilisateur placé au-dessus de la fraise de section peut servir à stabiliser la fraise par rapport au tubage soumis au fraisage. Une tarière à vis cylindrique placée en-dessous de la fraise de section peut servir à diriger les déblais de forage vers le bas.

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