Residual Oil Saturation

Definition - What does Residual Oil Saturation mean?

Residual Oil Saturation is the oil saturation left in a reservoir after extraction is done by conventional methods. It is the reduction of oil saturation which mainly occurs in reservoirs which are being depleted in secondary and primary programs. It is an important measure used to decide whether EOR are suitable for exploitation of a reservoir or not. It may depend on the heterogeneities present in the rock during the recovery processes. A number of methods are available for calculating the Residual Oil Saturation; however, every method does not produce the same outcome.

Petropedia explains Residual Oil Saturation

The Residual Oil Saturation is a non destructive and versatile method that can be carried out on both old and new wells. It is also conducted during open hole completions. Residual oil can be saturated on the reservoir for variety of reasons such as:

  • The fluids fail to sweep into different portions of the reservoir
  • The fluids employed are insufficient
  • Fluids carried out for a sufficient period of time

There are a variety of techniques that use diverse logging tools to carry out the entire process towards successful completion. The procedures remain the same during water saturation, gas saturation and hydrocarbon saturation.

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