TURBODRILL WITH ASYMMETRIC STATOR AND ROTOR VANES

摘要

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.