Combination milling tool and drill bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/08 (2006.01) E21B 10/46 (2006.01) E21B 10/54 (2006.01) E21B 10/56 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2238628

A combination metal milling and earth drilling tool (10), for use in performing a single trip kickoff from a casing in a well bore. The combination milling and drilling tool (10) has a first, relatively more durable cutting structure (20a, 22), such as tungsten carbide, and a second, relatively harder cutting structure (20b, 24), such as polycrystalline diamond. The more durable first cutting structure (20a, 22) is better suited for milling metal casing, while the harder second cutting structure (20b, 24) is better suited for drilling through a subterranean formation, especially a rock formation. The first cutting structure (20a, 22) is positioned so that the first cutting structure (20a, 22) will mill through the metal casing while shielding the second cutting structure (20b, 24) from contact with the casing. The first cutting structure (20a, 22) can wear away while milling through the casing. The second cutting structure (20b, 24) can then be used to drill through the rock formation.

L'invention porte sur une combinaison outil de forage /outil de fraisage de métaux (10) destinée à être utilisée pour effectuer une amorce de déviation une seule passe à partir d'un tubage de puits de forage. Cette combinaison fraise/trépan (10) présente une première structure coupante relativement plus durable (20a, 22) telle qu'une structure en carbure de tungstène, et une seconde structure coupante relativement plus dure (20b, 24) telle qu'une structure en diamant polycristallin. La première structure coupante (20a, 22) est mieux appropriée au fraisage du tubage métallique tandis que la seconde (20b, 24) est mieux appropriée au forage d'une formation souterraine, notamment d'une formation rocheuse. La première structure coupante (20a, 22) est placée de sorte que la première fraise le tubage métallique (20a, 22) tout en évitant à la seconde (20b, 24) d'être en contact avec le tubage. La première structure coupante (20a, 22) peut subir une usure lors du fraisage du tubage. La seconde structure peut ensuite être utilisée pour forer la formation rocheuse.

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