===<big>Formation Volume Factor of two Phase</big><big></big>===
===<big>Formation Volume Factor of two Phase</big><big></big>===
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Above bubble point pressure, gas and oil combined in one phase. For this case, fluid volume in reservoir have different value in surface volume, and it is called two-phase formation volume factor (Bt), expressed by :
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Above bubble point pressure, gas and oil combined in one phase. For this case, fluid volume in reservoir have different value in surface volume, and it is called two-phase formation volume factor (B<sub>t</sub>), expressed by:
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[[File:Rumus3.png|210px|thumbnail|center]]
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: <math>B_t = B_o + B_g (R_{s_i} + R_s)</math>
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Where,
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Where, Rsi = saturated gas in oil, Bg formation volume factor gas, and Rs gas saturated under bubble point.
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* R<sub>s<sub>i</sub></sub> = saturated gas in oil,
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* B<sub>g</sub> = formation volume factor gas, and
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* R<sub>s</sub> = gas saturated under bubble point