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The rest of the system includes a surface control package and
a three-phase power cable running downhole to the motor.
Because of the ESP’s unique application requirement in deep,
relatively small-bore casings, the equipment designer and
manufacturer are required to maximize the lift of the pump and the
power output of the motor as a function of the diameter and length
of the unit. Therefore, the equipment is typically long and slender.
The components are manufactured in varying lengths up to
approximately 30 ft, and for certain applications, either the pump,
seal, or motor can be multiple components connected in series
[11].
Throughout their history, ESP systems have been used to pump
a variety of fluids. Normally, the production fluids are crude oil
and brine, but they may be called on to handle:
 Liquid petroleum products
 Disposal or injection fluids
 Fluids containing free gas
 Some solids or contaminates
 CO 2 and H 2S gases or treatment chemicals
ESP systems are also environmentally esthetic because only the
surface power control equipment and power cable run from the
controller to the wellhead are visible. The controller can be
provided in a weatherproof, outdoor version or an indoor version
for placement in a building or container. The control equipment
can be located within the minimum recommended distance from
the wellhead or, if necessary, up to several miles away.
API RP11S3 provides the guidelines for the proper installation and
handling of an ESP system.
ESPs provide a number of advantages.
 Adaptable to highly deviated wells; up to horizontal, but
must be set in straight section.
 Adaptable to required subsurface wellheads 6 ft apart for
maximum surface-location density.
 Permit use of minimum space for subsurface controls and
associated production facilities.
 Quiet, safe, and sanitary for acceptable operations in an
offshore and environmentally conscious area.

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