ESP & Artificial Lift Monitoring
Most oil wells cannot flow naturally for their entire life. As reservoir pressure declines, artificial lift systems are installed to help bring fluids to the surface. The Electrical Submersible Pump (ESP) is one of the most common and powerful artificial lift methods - and one of the most expensive to replace when it fails.
Types of Artificial Lift
ESP (Electrical Submersible Pump)
A multistage centrifugal pump installed downhole, powered by an electric motor. Handles high flow rates (up to 30,000+ bbl/d) and is widely used in high-volume wells.
Gas Lift
Compressed gas is injected into the tubing-casing annulus to reduce the hydrostatic head, allowing the reservoir pressure to push fluids to surface. Common in offshore and high-GOR wells.
Rod Pump (Beam Pump)
The classic "nodding donkey." A surface beam unit drives a downhole plunger pump via sucker rods. Common in low-rate onshore wells.
PCP (Progressive Cavity Pump)
A helical rotor turns inside a stator to move fluid upward. Good for heavy oil and viscous fluids with high sand content.
ESP Monitoring Parameters
ESPs are monitored using a downhole gauge package installed below the motor that measures critical operating parameters in real time:
Motor Temperature
Overheating indicates cooling loss or overload
Intake Pressure
Low intake = gas locking or pump-off risk
Discharge Pressure
Indicates pump performance and tubing conditions
Motor Current
Amperage changes indicate loading or wear
Vibration
Increasing vibration = bearing wear or imbalance
Pump Frequency
VSD-controlled speed for rate optimisation
Use Case: ESP Failure Prevention
A production engineer monitoring an ESP well notices that motor temperature has increased from 130°C to 155°C over three days while intake pressure has dropped. The system flags this as abnormal. Investigation reveals that a nearby well was recently put on production, drawing down the shared reservoir and reducing fluid supply to the ESP. The engineer reduces pump speed by 5 Hz via the Variable Speed Drive (VSD), stabilising motor temperature and avoiding a burnout that would have cost $500,000+ in workover expenses.