Turbodrill with asymmetric stator and rotor vanes

Details Turbodrill with asymmetric stator and rotor vanes Turbodrill with asymmetric stator and rotor vanes

E - Fixed Constructions

21

B

E21B 4/02 (2006.01) F03B 13/02 (2006.01)

Patent

CA 2560589

A turbodrill has rotor vanes and stator vanes that are asymmetric with respect to each other. The rotor blade on which the rotor vanes are disposed has a reaction of less than about 0.5. A method of designing a turbodrill comprises optimizing a first design of stator vanes and optimizing a second design of rotor canes using computational fluid analysis. In one aspect the invention relates to a turbodrill comprising a connection on an upper end adapted to connect to a drill string; a connection on a lower end adapted to connect to a drill bit; and at least one stage comprising, a stator blade having a plurality of stator vanes spaced around a circumference of the stator blade, and a rotor blade having a plurality of rotor vanes spaced around a circumference of the rotor blade, wherein the stator vanes and rotor vanes are asymmetric relative to each other, wherein a reaction of the rotor blade is less than about 50 percent.

Turboforeuse dotée d'aubes de rotor et d'aubes de stator asymétriques les unes par rapport aux autres. Le coefficient de réponse du rotor sur lequel les aubes de rotor sont placées est inférieur à 0,5. L'invention comprend une méthode de conception de turboforeuse permettant d'optimiser un premier modèle d'aubes de stator et un second modèle d'aubes de stator au moyen de l'analyse numérique des fluides. Un aspect de l'invention concerne une turboforeuse comprenant un dispositif de connexion à une extrémité supérieure conçu pour se connecter à un train de tiges, un dispositif de connexion à une extrémité inférieure conçu pour se connecter à un trépan, au moins un compartiment comprenant un stator doté de plusieurs aubes disposées sur la circonférence du stator et un rotor doté de plusieurs aubes disposées sur la circonférence du rotor. Les aubes de stator et les aubes de rotor sont asymétriques les unes par rapport aux autres. Le coefficient de réponse du rotor est inférieur à 50 %.

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