Schlumberger

Modular ESP Protectors

The patented modular ESP protector provides the ultimate protection available against well fluid entering the motor. There are three options for the oil reservoir chamber:

  • The labyrinth section simply uses the differential weight of the fluid to create a barrier and a maze for the wellbore fluid to travel through before it enters the motor. These were the first protectors used and are still very popular in vertical wells.
  • The positive seal protector, or elastomer bag, provides a barrier between the well fluids and the motor oil to allow operation in gaseous or deviated wells. The bags come in different materials depending on the application.
  • The metal bellows is also a positive seal to well fluids and provides an impervious barrier to H2S, which tends to permeate elastomers and enter the motor. The bellows is also rated for high-temperature applications up to 475 degF (246 degC).

In addition to the function of a seal, the ESP protector also serves as an oil reservoir for the motor, balances the internal pressure of the well fluid, and carries the thrust load of the pump.

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Protecting Motors from Well Fluid

ESP protector
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