Gas Cap Ratio
Gas Cap Ratio Formula
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\( n_i \;=\; \dfrac{ G_c \cdot G_f }{ OIP \cdot B_o } \) (Gas Cap Ratio) \( G_c \;=\; \dfrac{ n_i \cdot OIP \cdot B_o }{ G_f } \) \( G_f \;=\; \dfrac{ n_i \cdot OIP \cdot B_o }{ G_c } \) \( OIP \;=\; \dfrac{ G_c \cdot G_f }{ n_i \cdot B_o } \) \( B_o \;=\; \dfrac{ G_c \cdot G_f }{ n_i \cdot OIP } \) |
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| Symbol | English | Metric |
| \( n_i \) = Gas Cap Ratio | \(dimensionless\) | - |
| \( G_c \) = Initial Gas Cap Volume | \(ft^3 \;/\; bbl\) | - |
| \( G_f \) = Initial Gas Formation Volume Factor | \(ft^3 \;/\; bbl\) | - |
| \( OIP \) = Initial Oil in Place | \(bbl\) | - |
| \( B_o \) = Initial Oil Formation Volume Factor | \(bbl \;/\; STB\) | - |
Gas cap ratio, a dimensionless number, in a reservoir is the ratio of the volume of free gas in the gas cap to the volume of oil in the oil zone within a petroleum reservoir. It is a parameter in reservoir engineering as it helps to determine the overall recovery strategy and production plan. The gas cap acts as a natural pressure maintenance mechanism for the reservoir. As oil is produced and pressure drops, the gas in the gas cap expands and helps to maintain reservoir pressure, which can enhance oil recovery.
Tags: Reservoir