Improved casing shoe

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/14 (2006.01) E21B 7/20 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2214749

A casing shoe (30) for use in guiding a casing into a wellbore comprises a generally cylindrical body (32) having a box portion (34) at its rearward end for connection to a casing string and having a generally rounded nose portion (36) at its forward end. The forward end of the shoe includes cutting structures (42, 44) in the form of raised flutes extending along the sides of the cylindrical body and on the nose portion. The flutes may be provided with cutting elements such as polycrystalline diamond compact elements (48) at least at the forward ends of the flutes (42) extending along the cylindrical body. These flutes may also be configured to serve as stabilising pads, and additional stabilising pads (38) may also be provided. The nose portion may include fluid passages (50). The shoe may be adapted to be capable of being drilled through, such as by forming the nose portion from a drillable material. The provision of cutting structures on the casing shoe allows the tool to remove or negotiate obstacles which would prevent the passage of conventional casing shoes. The trailing ends of the various flutes may be provided with abrasive material to provide a back-reaming capability. The nose portion may also be eccentrically shaped to assist in negotiating obstacles.

Ce sabot (30) de cuvelage, utile pour guider un cuvelage dans un puits de forage, comprend un corps (32) généralement cylindrique présentant une partie caisson (34) au niveau de son extrémité arrière aux fins de raccordement à une colonne de cuvelage, ainsi qu'une partie nez (36), arrondie, au niveau de son extrémité antérieure, laquelle comporte des structures (42, 44) coupantes sous la forme de nervures surélevées s'étendant le long des côtés du corps cylindrique et sur la partie nez. Ces nervures peuvent être pourvues d'éléments coupants, tels que des éléments (48) compacts à diamant polycristallin, au moins au niveau des extrémités antérieures des nervures s'étendant le long du corps cylindrique, et sont également conçues pour servir de patins de stabilisation, des patins (38) de stabilisation supplémentaires pouvant être également montés. La partie nez peut comporter des passages (50) pour fluides. On peut concevoir ce sabot de manière à permettre un forage à travers celui-ci, en formant, par exemple, la partie nez dans un matériau forable. Le montage de structures coupantes sur le sabot de cuvelage permet à cet outil d'enlever ou de franchir des obstacles, lesquels empêcheraient le passage de sabots de cuvelage classiques. Les extrémités arrières des diverses nervures peuvent être pourvues de matériau abrasif afin de permettre un rétro-alésage. La partie nez peut également avoir une configuration excentrique, afin d'aider au franchissement d'obstacles.

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