FORMATION TESTER-1: Cased-hole tester provides field testing alternative

A cased-hole formation tester proved to be a viable alternative for obtaining reservoir fluid samples and pressure data for characterizing an offshore China oil field. Click here to enlarge imagePhillips Petroleum Co. in 1999 ran 25 tests on wireline in seven wellbores in the Bohai Bay Peng Lai 19-3 field, containing stacked, unconsolidated heavy oil reservoirs (Fig. 1).Phillips originally had planned to run drillstem tests (DSTs) but decided otherwise because of the number of DSTs required and the presence of the heavy, viscous oil. The unconsolidated formations and heavy oil also precluded use of an openhole formation tester.The cased-hole formation tester run was Schlumberger's Mo...

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