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A centrifugal pump is lowered into a well and retrieved from the well by means of its power cable. The power cable has a single conductor. The pump has a downhole electrical motor which is three-phase. Single-phase AC power will be supplied from the surface down the conductor, with the return being

A centrifugal pump is lowered into a well and retrieved from the well by means of its power cable. The power cable has a single conductor. The pump has a downhole electrical motor which is three-phase. Single-phase AC power will be supplied from the surface down the conductor, with the return being the casing. A phase converter converts the single-phase AC power to three-phase AC power downhole for driving the pump motor.

대표청구항 ▼

In a well having casing containing formation fluid, an improved means for pumping the fluid to the surface, comprising in combination: a centrifugal pump located within the well; a submersible three-phase electrical motor located within the well and coupled to the pump for driving the pump; a cable

In a well having casing containing formation fluid, an improved means for pumping the fluid to the surface, comprising in combination: a centrifugal pump located within the well; a submersible three-phase electrical motor located within the well and coupled to the pump for driving the pump; a cable having a conductor, the cable having a lower end connected to the motor and an upper end extending to the surface, the cable having sufficient strength to support the weight of the pump and motor, allowing the pump and motor to be lowered into and retrieved from the well on the cable; means for supplying single-phase AC power from the surface down the conductor; and means located at the lower end of the cable for converting the single-phase AC power to three-phase electrical power to power the motor.