TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn the Oriente basin of Ecuador several operators, including the National Petroleum operator, are producing oil at approximately 455,000 B/D and having high numbers of workovers. Many wells have been closed because they were considered uneconomic, and studies have been carried out to re-open them and increase the production.Some operators have big problems because of aggressive corrosion in the old strings. In many wells the corrosion is so great that a part of the casing literally disappears. Splits and cracks are very common in old strings. Under these conditions, the life of the well is limited to the life of the casing if a good solution is not found.To solve these problems, we demonstrated a use of special fibers technology that is outside its original design purpose. From the economical side to close a well means to lose the investment made in the well and lose the oil production. For this reason, finding a good technical solution that allows the wells to be reopened adds value to an existing asset and contributes to ultimate recovery.In the past conventional cement slurries were used to address the problem with poor results; the cement could not support the pressure test.

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