Down hole sensors are used to monitor and log critical down hole parameters used for reservoir management and ESP monitoring and control.

Sensors may be attached to common brands of ESP motors if an upper tandem or centre tandem motor is employed. Data is transmitted to the surface with a digital signal that travels along the main ESP power cable. A surface choke is used to isolate the motor voltage before the signal is interpreted by the surface interface panel.

A data logger or an ESP motor controller, serially connected to the surface interface panel, performs the data logging function. The controller can also perform control or alarm shutdown functions based on set points against down hole data.

Recent advances in down hole sensor technology have resulted in reliable and lower cost sensors for use with ESP’s. There are two key advantages to operating a system with a down hole sensor:

1. Sensors provide additional protection for an ESP system, particularly against motor overheating, a common source of failure and reduced run life.
2. Valuable data can be gained from the reservoir, optimizing production and minimizing service costs.

There are a number of different sensor models on the market. Typical parameters currently capable of being measured are:

  • Well Bore Pressure
  • Well Bore Temperature
  • Motor Winding Temperature

Some models are capable of measuring more advanced parameters, including:

  • Discharge Pressure
  • Insulation Resistance
  • 2-Plane Motor Vibration

COSCO is a leader in this technology and can provide several sensor options to meet any production requirement:


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