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ESP system uses an electric pump at the bottom of the well to push oil to the surface, maintain flow in deep areas, and prevent productive fields from being abandoned prematurely
The ESP allows oil to be extracted from wells when natural pressure no longer sustains production, using an Electric Submersible Pump installed at the bottom to move large volumes of fluids to platforms or ships.
How ESP keeps production active
Artificial lift by ESP comes into operation when the well does not have enough force to bring the oil to the surface on its own.
The system works like a large submerged “vacuum cleaner,” designed to push oil and fluids without interrupting platforms.
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The acronym ESP stands for Electric Submersible Pump. The electric equipment is located at the bottom of the well and uses rotor stages, which spin at high speed to overcome gravity and the distance to production.
This method is valued because it moves large volumes of liquid. With this mechanical support, fields that could be abandoned prematurely continue to generate production and preserve resources on the seabed.
The equipment at the bottom of the well
Operation begins with an electric cable that carries power from the surface to the pump motor. This motor drives the pump stages, creating pressure for the oil to enter the equipment and flow through the tubing.
The electric motor provides the system’s power and must remain isolated to prevent short circuits in contact with water. The protector, also called a seal, equalizes pressure and prevents oil from damaging the motor.
The centrifugal pump contains rotating discs that generate pressure for fluid displacement. The power cable completes the system, carrying electricity hundreds of meters to the submerged equipment.
Without this connection, the pump cannot maintain the required pace in deep wells. Therefore, each part of the assembly must operate in an integrated manner at the bottom.
High flow rate is the main advantage of ESP
The great strength of ESP lies in its flow rate. Depending on the model, the system can pump from 200 to over 20,000 barrels per day, an attractive performance for deep wells or those with a lot of mixed water.
Even with a high cost, the equipment can be financially worthwhile by maintaining constant extraction for 24 hours.
This continuous operation helps sustain the operational flow and the expected return for companies.
Another important point is the speed control performed from the surface. Engineers adjust the pump’s power as the well’s behavior changes, preventing excess or lack of power.
Failures can cost millions in downtime
Excessive heat, sand, and gas are among the main challenges of artificial lift by ESP. These factors wear down internal parts and affect the equipment’s performance at the bottom.
When a failure occurs, repair requires bringing the entire assembly to the surface. This type of intervention can cost several million reais, mainly due to downtime and necessary maintenance.
To reduce risks, sensors monitor vibration and temperature. This monitoring helps prevent unexpected interruptions and keeps oil flowing to become fuel and other products used in daily life.
Technology gains strength in deep waters
ESP stands out in deepwater fields, where the distance and weight of the oil column require power that compressed air cannot deliver. In these scenarios, pressure control defines utilization.
The technology allows the exploration of reserves that, a few decades ago, were considered impossible. With more advanced materials, pumps remain longer on the seabed, reinforcing operational safety.
This advance sustains heavy oil production and helps maintain national supply. When pressure is controlled at the bottom, the well ceases to be just a hole in the ocean and remains productive until the refinery.
With information from Monitor do Mercado.
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