Free Gas in Place Formula |
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\( G_f \;=\; 7758 \cdot A \cdot h \cdot n \cdot ( 1 - S_{wi} ) \cdot E_{gi} \) (Free Gas in Place) \( A \;=\; \dfrac{ G_f }{ 7758 \cdot h \cdot n \cdot ( 1 - S_{wi} ) \cdot E_{gi} }\) \( h \;=\; \dfrac{ G_f }{ 7758 \cdot A \cdot n \cdot ( 1 - S_{wi} ) \cdot E_{gi} }\) \( n \;=\; \dfrac{ G_f }{ 7758 \cdot A \cdot h \cdot ( 1 - S_{wi} ) \cdot E_{gi} }\) \( S_{wi} \;=\; 1 - \dfrac{ G_f }{ 7758 \cdot A \cdot h \cdot n \cdot E_{gi} }\) \( E_{gi} \;=\; \dfrac{ G_f }{ 7758 \cdot A \cdot h \cdot n \cdot ( 1 - S_{wi} ) }\) |
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| Symbol | English | Metric |
| \( G_f \) = Free Gas in Place | \(ft^3\) | - |
| \( A \) = Drainage Area | \(ft^2\) | - |
| \( h \) = Thickness | \(ft\) | |
| \( n \) = Porosity | \(dimensionless\) | - |
| \( S_{wi} \) = Initial Water Saturation | \(dimensionless\) | - |
| \( E_{gi} \) = initial gas Expansion Factor | \(ft^3 \;/\; bbl\) | - |
