SAMPSON, IBINYE ETEYEN
ADVANTAGES AND DISADVANTAGES OF ESP
ESP PERFORMANCE CURVE
ESP, is an efficient and reliable artificial-lift method for lifting
moderate to high volumes of fluids from wellbores.
ESP is used in Old well producing a large volume of water
compared with volume of oil
Pump powered by an electric motor, supplied with current
through an insulated armoured cable
The whole assembly is submerged in the fluid to be pumped
and pushes fluid to the surface.
ARTIFICIAL LIFT TECHNOLOGIES
Beam/Sucker rod pumps,
Electric submersible pumps.
The ESP’s main components
A multistage centrifugal pump
A seal-chamber section
A three-phase induction motor
Adaptable to highly deviated wells; up to
horizontal, but must be set in straight section.
Quiet, safe, and sanitary in an offshore and
environmentally conscious area.
Increased volumes and water cuts
Permits placing wells on production even while
Good in harsh environment.
Tolerate minimal % of solids
Need relatively large (> 4½-in. OD) casing size
for moderate- to high-production-rate equipment.
Not suitable for viscous fluids.
USES OF ESP
Produced water injection
Liquid petroleum products
Disposal or injection fluids
Fluids containing free gas
Some solids or contaminates
CO2 and H2S gases or treatment chemicals
Produced water disposal
CO2 flood injection/booster
Crude oil transfer
ESP SELECTION AND PERFORMANCE
1. Basic data: Well data, Production data, Well fluids
conditions, Power sources, Possible production problems.
2 . Production capacity: PI and IPR
3 . Gas calculations: Bg, Bo, Total volume of fluids
4. Total dynamic head, TDH
5. Pump type: pump selection
6. Optimum size of components: Pump, Separator,
Motor, Seal selection
7. Electric cable: Cable size, Cable type, Cable length,
8. Accessory and optional equipment: Downhole
accessory equipment, Motor controllers, Single-phase and
three-phase transformers, Surface cable, Wellheads and
accessories, Servicing equipment, Optional equipment
9. Variable speed submersible pumping system
As system design engineers and production
engineers evaluate costs, maintenance
requirements, environmental impact, efficiency
and flexibility, long life of ESP equipment is
required to keep production economical.
ESP should be used for high water cut wells of
up to 75%, to improve productivity.