Electric Submersible Centrifugal Pumps

Electric submersible centrifugal pumps are adapted to a wide variety of pumping conditions. However, because of their high capacity, they are most frequently installed in wells where the volume of fluid to be produced exceeds the capacity of sucker rod or reciprocating hydraulic pumps. They are installed suspended from the discharge tubing and submerged in the well fluid. A three-conductor electric cable strapped to the discharge tubing transmits the power to the motor to the end of the pump.

The electric submersible pump system is illustrated schematically in Figure 15. The electric motor and pump rotate at 3500 rpm to 60-Hz power and 2900 rpm for 50-Hz power. The electric motor is directly coupled to the pump with a seal section between the two. The motor is filled with an oil especially selected to provide high dielectric strength, lubrication for the bearings, and good thermal conductivity. The seal section isolates this

FIGURE 15 Electric submersible centrifugal pump system (PennWell Publishing)

fluid from the pump and allows for expansion and contraction of the fluid with temperature changes at the bottom of the well. The motor, which is the bottom element of the assembly, is usually installed in the well above the casing perforations where the fluid enters the well bore. This allows all of the fluid entering the pump suction to flow past the motor housing and provide the needed cooling.

TABLE 6 Typical characteristics electric submersible centrifugal pumps

Well

Motor

Pump

Motor

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