Gas formation volume factor, abbreviated as \(G_f\), is the volume of gas at reservoir conditions (high pressure and high temperature) to the volume of gas at standard conditions (usually 14.7 psi and 60°F).
Importance
Volumetric Calculations - This is used to convert gas volumes measured at reservoir conditions to standard conditions. This conversion is essential for estimating reserves and for various calculations involving reservoir performance and production forecasting.
Reservoir Engineering - It helps in understanding and modeling the behavior of gas in the reservoir, which is important for optimizing recovery and managing the reservoir effectively.
Gas Formation Volume Factor Formula |
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\( G_f \;=\; \dfrac{ 0.005032 \cdot z \cdot T }{ p }\) (Gas Formation Volume Factor) \( z \;=\; \dfrac{ G_f \cdot p }{ 0.005032 \cdot T }\) \( T \;=\; \dfrac{ G_f \cdot p }{ 0.005032 \cdot z }\) \( p \;=\; \dfrac{ 0.005032 \cdot z \cdot T }{ G_f }\) |
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| Symbol | English | Metric |
| \( G_f \) = Gas Formation Volume Factor | \(bbl \;/\; SCF\) | - |
| \( z \) = Gas Deviation Factor | \(dimensionless\) | - |
| \( T \) = Temperature | \(R\) | - |
| \( p \) = Pressure (psi) | \(lbf \;/\; in^2\) | - |
