Pipe alignment apparatus for use on wellhead derrick

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/14 (2006.01) E21B 17/10 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2140203

An alignment apparatus for use on a well derrick or drilling rig for engagement with a pipe section either being connected to or disengaged from the upper end of pipe string within a well bore hole. The apparatus includes a supporting frame for connection to the framework of the derrick and carrying a head assembly for engaging an upper pipe section in a manner to align the pipe section with a pipe section within the bore hole and yet allowing rotation of the upper pipe section. The head assembly includes a fixed pipe engaging member and movable arms pivotable to a closed position, the pipe engaging member and the arms all having pipe engaging surfaces. Adjustment mechanisms are provided to accomplish positioning of the fixed pipe engaging member and the arms so that the pipe engaging surfaces of the member and the arms can be selected whereby the surfaces are each spaced from the aligned central axis of the pipe section a distance slightly greater than the radius of the outside diameter of the pipe when the arms are moved to a closed position. The apparatus is capable of quick and accurate alignment of pipe sections and may be readily adjusted to permit use with a variety of sizes of pipes.

Cette invention concerne un dispositif de centrage à monter sur tour de forage et servant à aligner sur la colonne de tubage d'un puits un tronçon de tube à être mis en place ou enlevé. Le dispositif comprend un bâti support à être fixé à l'ossature de la tour de forage et une tête de guidage servant à enserrer la partie supérieure d'un tronçon de tube de façon à l'aligner sur le dernier tronçon de tube placé dans le puits tout en le laissant libre de tourner. La tête de guidage se compose d'une partie fixe et de doigts articulés permettant de refermer le dispositif sur le tronçon de tube à manoeuvrer, toutes les parties, fixe et mobiles, ayant un profil s'adaptant à la forme du tube. Le dispositif comporte des mécanismes de réglage permettant de positionner les parties fixe et mobiles de la tête de guidage à une distance de l'axe de rotation du tube légèrement plus grande que le diamètre extérieur de celui-ci lorsque les doigts mobiles sont refermés. Le dispositif permet un alignement rapide et précis des tronçons de tube et s'adapte aisément à différents diamètres de tube.

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