Successful Application of Fiber-Optic-Enabled Coiled Tubing and Inflatable Packer Used for Testing the Formation's Upper Zone
Floreña field, located north of the Cusiana and Cupiagua fields,
has been producing since 2001. Floreña field is part of the series of
thrust sheets developed as result of the Eastern Cordillera uplifting.
In order to determine pressure depletion, establish connectivity between
wells, reduce the risks of geological uncertainty along the field, and meet
Ministry of Mines data acquisition commitments, we performed a pressure buildup
test using inflatable packers as the isolation method.
In the past, when a pressure buildup test was required in the
wells upper formation, operators had to set up a bridge plug in the
lowest part of the tested formation, set up a sand plug, and finally, pump a
cement plug. These extra steps increased HSE risks and project costs.
A synergistic approach using real-time downhole measurements from fiber
optic coiled tubing were combined with the cased hole inflatable packer to
improve operation reliability while reducing risk of failure and time.
The availability of real-time logging casing collar locator (CCL),
annular, coiled tubing (CT) bottomhole pressure, and bottomhole temperature
data allowed the inflatable packer to be set properly. The measurements helped
ensure adequate packer inflation, monitor the maximum draw down without
exceeding the packer integrity, and perform a well test to a specific formation
in just one run. In addition, the BHA configuration allows a memory tool down
the packer to record the lowest formation static pressure.
After the pressure buildup test was performed, the results showed well
connectivity with Floreña Field. The test also confirmed reservoir
pressure and permeability which helped in future job and field planning.