Whipstock

Details Whipstock Whipstock

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 10/50 (2006.01) E21B 21/10 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2271795

A whipstock (10) has a flowchannel (41) therethrough to facilitate the rapid lowering of the whipstock through liquid in an oil well. A whipstock (10) has a guide surface and a sacrificial element (20) spaced from the guide surface. In use, the sacrificial surface prevents the starting mill damaging the guide surface during the formation of the initial opening in a casing. The undamaged guide surface can later be used for accurately guiding tubulars and tools to help ensure that lateral bores are correctly positioned.

Ce sifflet déviateur (10) présente un conduit intérieur (41) sur sa longueur, destiné à faciliter l'abaissement rapide du sifflet dans du liquide, dans un puits de pétrole, et il comporte une surface de guidage ainsi qu'un élément sacrificiel (20), espacé de cette surface. Pendant l'utilisation du sifflet, la surface sacrificielle empêche la fraise en bout d'endommager la surface de guidage, lors de la formation de l'ouverture initiale dans un tubage. On peut ensuite utiliser cette surface de guidage non endommagée pour guider de manière précise des éléments tubulaires et des outils, afin de s'assurer du positionnement correct des sondages latéraux.

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