RING MOTOR PUMP

摘要

The invention relates to a rotor-dynamic, centrifugal pump for use in pumping of hydrocarbons and water in a downhole application. The pump is designed with a plurality of steps arranged in the longitudinal direction and adapted to be set in a well, wherein each step consists of a motor and one or more pump stages, which include a diffuser and a rotatable impeller for radially accelerating a liquid, which diffuser is arranged to conduct the liquid to a higher level, and thus pump the liquid upwards in the well. The impellers in each step are driven by a common motor, and the motor is configured as a ring motor, the liquid being able to flow in the centre of the motor.