The well was producing 150 bbl/d with 2.5% BS&W from the Napo T
formation at a depth of +/- 10,000 ft, with high permeability (>250 mD),low
pressure (<2,000 psi), and high temperature (<210 degF), when an ESP
failure required the well to be shut in and worked over. During the workover,
the pay zone was reperforated and tested at 336 bbl/d with 27% BS&W. To
avoid further losses of completion fluid to the formation while replacing the
ESP, a PROTECTOZONE VP viscous pill was spotted across the perforated
When the well was put back on production after the workover, which
lasted 7 days, the well produced 520 bbl/d with 5% BS&W. Currently, after
more than one year, production has stabilized at 459 bbl/d of fluid with no
change in BS&W.
The added value of using PROTECTOZONE VP pills to effectively isolate
and protect reservoirs during workover operations has been repeatedly
demonstrated in various PetroEcuador fields.