low

C. More information about the reservoir is as
follow:
• Carbonate field with large water production
~95% watercut
• Short well distances
• Water cycled
• Residual saturation also known from cores to
be about 25%
In the Lagrave case the six new tracers yielded
a saturation of 24 +/- 1 %, based on retention
times, which corresponds very well to saturation
measurements on core samples.
Figure 7: The pilot area in the Lagrave field
Figure 8: Research status prior to the Lagrave pilot: 6
Partitioning tracers qualified and ready for pilot field
experiments
Conclusion from Lagrave pilot:
• Six tracers have been qualified in laboratory
and field test.
• Field pilot confirms the applicability of the
tracers
• Partitioning tracers can be used to estimate oil
saturation in the inter well region
Figure 9: Saturation from PITT in Lagrave
Conclusion
Taking advantages of tracer technology, it could
be categorized in three sub division: tracer
applications in well construction, piloting and full
field monitoring of EOR projects. Tracer is one
of the most cost-saving and effective techniques
enabling to increase confidence on operations
which are under performing. Generally speaking,
tracers are usable in monitoring most fluid
conduits which are necessary to be controlled.
Tracers are designed to be used during the entire
life cycle of a reservoir from natural depletion
to IOR and EOR where tracers can be added into
injected fluids. Piloting any types of EOR methods,
tracers are providing valuable information on
well connectivity and describing the dynamics of
complex formations, including fractures, faults
and channels, which can be resulted in a better
or optimized drainage strategy from a reservoir
leading to better sweep efficiency.
Tracer has also been widely used by several
operators to measure residual oil saturation in
secondary production (i.e. water flooding) as
well as tertiary production (i.e. low salinity water
flooding and surfactant), and results have helped
companies to make a better decision for the
future of the EOR projects.
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