Casing bit and casing reamer designs

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/36 (2006.01)

Patent

CA 2755564

A casing end tool has a bowllike (or cup-like) body defined by a wall having an outer convex surface and an inner concave surface opposite of the outer convex surface. The bowl-like body has a center axis. The inner concave surface is non-axisymmetric with respect to the center axis, while the outer convex surface is axisymmetric with respect to the center axis. The non-axisymmetric configuration is provided in one implementation through the presence of a set of raised boss or land structures formed on the inner concave surface. In another implementation, the non-axisymmetric configuration is provided by channels formed in the inner concave surface.

La présente invention concerne un outil d'extrémité de tubage qui possède un corps en forme de bol (ou en forme de coupelle) défini par une paroi qui présente une surface convexe extérieure et une surface concave intérieure opposée à la surface convexe extérieure. Le corps en forme de bol possède un axe central. La surface concave intérieure est non axisymétrique par rapport à l'axe central, alors que la surface convexe extérieure est axisymétrique par rapport à l'axe central. La configuration non axisymétrique est assurée, dans une mise en uvre, par la présence d'un jeu de structures de bossage ou de plage relevées formées sur la surface concave intérieure. Dans une autre mise en uvre, la configuration non axisymétrique est assurée par des gorges formées dans la surface concave intérieure.

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