Case studies

Inter-well oil saturation measurement from tracers

Restrack is proud to introduce new tracers suitable for measuring inter-well oil saturation at reservoir conditions. We believe that with the new tracers, the partitioning inter-well tracer test (PITT) could become the standard method to identify EOR targets and to evaluate the performance of EOR operations.

The partitioning inter-well tracer test (PITT) is a non-intrusive low-cost test that can provide measurement of oil saturation in the region between injectors and producers in an oilfield.The test is run during normal operation of both injector and producer and thus neither cause loss of production nor halt of injection.

Lack of stable partitioning tracers has previously limited the application of PITTs in petroleum reservoirs. A recent field test in the Total operated Lagrave oil field proved the stability and reliability of six new partitioning tracers at reservoir conditions.


In PITTs remaining oil saturation is given from the difference in retention times for the partitioning and water tracers, in addition to the oil/water partition coefficient. The partitioning coefficient is measured at Restrack’s labs, based on oil & water samples from the field.

In the Lagrave case the six new tracers yielded a saturation of 24 +/- 1 %, based on retention times. This result was later verified and corresponds very well to saturation measurements on core samples.


For more information regarding how Restrack can measure oil saturation in petroleum reservoir inter-well regions, please download the whitepaper below.

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