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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractAn extended welltest was successfully performed on a deep, sour, high-pressure, high temperature remote onshore appraisal well using a permanent downhole monitoring system. Prior to the six-month extended test an initial test and stimulation treatment was performed on the well. The permanent monitoring system provided continuous pressure, temperature and rate measurement data in a technically challenging completion environment. Complete and accurate data was obtained on-line for performance monitoring, reservoir simulation and analytical test analysis. Unforeseen completion challenges and wellbore restrictions would have resulted in alternative conventional data collection methods yielding severely restricted data suites and test results.

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