Apparatus for milling a well casing

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 29/06 (2006.01) E21B 7/06 (2006.01) E21B 23/01 (2006.01)

Patent

CA 2199825

Apparatus for milling a well casing (15) comprising an elongate guide member (1) having a leading end and a trailing end, the guide member having defined thereon a guide track (23) which, in the use position of the guide member, converges with the well casing to be milled from the trailing end of the guide member towards the leading end thereof. A support member (4) is selectively movable along the guide track in the direction from the trailing end towards the leading end of the guide member to converge with the well casing to be milled. A milling tool (5) has a leading end rotatably supported by the support member (4) and includes milling means (6) located rearwardly of its leading end. A releasable coupling initially maintaining the support member (4) and leading end of the milling tool adjacent the trailing end of the guide member and is releasable to permit movement of the support member (4) along the guide track towards the leading end of the guide member to bring the milling means into milling engagement with the casing to be milled.

Un dispositif servant à fraiser un tubage (15) et comprenant un élément de guidage allongé (1) pourvu d'une extrémité arrière et d'une extrémité avant et sur lequel se trouve une piste de guidage (23) qui, en position de fonctionnement de l'élément de guidage, converge avec le tubage à fraiser depuis l'extrémité arrière de l'élément de guidage en direction de son extrémité avant. Un élément de support (4) est mobile sélectivement le long de la piste de guidage dans un sens à partir de l'extrémité arrière vers l'extrémité avant de l'élément de guidage, de manière à converger avec le tubage à fraiser. Un outil de fraisage (5) possède une extrémité avant supportée rotative par l'élément de support (4) et comprend des moyens de fraisage (6) situés à l'arrière de son extrémité avant. Un accouplement réversible maintient initialement l'élément de support (4) et l'extrémité avant de l'outil de fraisage en position contiguë à l'extrémité arrière de l'élément de guidage et permet le déplacement de l'élément de support (4) le long de la piste de guidage vers l'extrémité avant de l'élément de guidage, de façon à mettre en contact le moyen de fraisage avec le tubage à fraiser.

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