Single-trip efficiency needed for the testing of exploration wells
Cardon IV, a joint venture between Repsol and ENI, needed to safely and
efficiently perform a series of downhole tests on its high gas rate wells to
determine the reservoir properties of a field in the northwest section of the
Gulf of Venezuela. Initial plans were to drill two exploration wells with the
possibility of adding three additional wells.
Operations required premium connections for the downhole test string.
However, drill collars with premium connections were not available in country
and would have to be imported, an expensive option. Another challenge was to
eliminate the use of a permanent packer to avoid three separate trips for each
test. The objective was to perforate a 500-ft interval underbalanced and
perform single-trip reservoir testing.
To reduce the likelihood of a leak, the client wanted a minimum amount
of tools to be run in the test string, which would include independently
activated downhole samplers. Finally, to help decide the optimal time for flow
and shut-in periods, downhole pressure data transmission had to be delivered in
real time to client offices off site.