某油田經(jīng)過延長測試獲得一組下面的數(shù)據(jù)。請根據(jù)這組數(shù)據(jù)計(jì)算該井的采油指數(shù)PI值?；緮?shù)據(jù)：
（1）油層中部靜壓MPa=27.3。
（2）用∮=50.8mm的油咀求產(chǎn)，日產(chǎn)油量788m3。
（3）在日產(chǎn)原油788m3的條件下，井底流壓為25.79MPa。
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