FORMATION TESTER-Conclusion: Cased-hole formation tester shows advantages

Experience in 1999 during appraisal of the Peng Lai 19-3 field, off China, showed that a cased-hole formation tester has numerous benefits with few drawbacks.This concluding article of a two-part series describes the cased-hole formation tester tool as well as a testing procedure developed during the work at Peng Lai 19-3. This Bohai Bay field has numerous layered, productive zones with a wide range of reservoir pressures, fluid properties, and formation permeabilities.As discussed in the first article (OGJ, June 11, 2001, p. 49), the cased-hole tester appraised many reservoirs in the field that would have been difficult or expensive to test with drillstem (DST) tools or a wireline openho...

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