Abstract
Since the introduction of Schlumberger Wineline Formation Tester (FT) in Japan (1955), about 240 tests were run.Statistics show that one third of these tests recovered considerable amount of reservoir fluids and formation evaluation could be made by means of FT. However the next one third showed dry and the remaining one third of the tests failed mechanically. For the successful test, it is important to properly select the formation to be tested. As the formation becomes thicker, the success ratio of FT becomes higher. Volcanic reservoirs are favorable but very shaly sands and tuffaceous sands are not suitable for the FT. Provided the results of FT do not show the promises, the well should not be abandoned immediately, because about ten percent of such tests shows productivity of the well after the completion tests.
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