Compressibility Drive in Gas Reservoirs
Compressibility Drive in Gas Reservoirs Formula |
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\( CI \;=\; \dfrac{ G \cdot G_{zd} }{ G_{fv} \cdot G_p } \) (Compressibility Drive in Gas Reservoirs) \( G \;=\; \dfrac{ CI \cdot G_{fv} \cdot G_p }{ G_{zd} } \) \( G_{zd} \;=\; \dfrac{ CI \cdot G_{fv} \cdot G_p }{ G } \) \( G_{fv} \;=\; \dfrac{ G \cdot G_{zd} }{ CI \cdot G_p } \) \( G_p \;=\; \dfrac{ G \cdot G_{zd} }{ CI \cdot G_{fv} } \) |
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| Symbol | English | Metric |
| \( CI \) = Compressibility Index | \(dimensionless\) | - |
| \( G \) = Gas in Place | \(MSCF\) | - |
| \( G_{zd} \) = Gas Compressibility Drive | \(ft^3\;/\;MSCF\) | - |
| \( G_{fv} \) = Gas Formation Volume Factor | \(ft^3\;/\;MSCF\) | - |
| \( G_p \) = Gas Produced | \(MSCF\) | - |
In gas reservoirs, compressibility drive is the natural energy mechanism by which gas expands as the pressure within the reservoir declines, helping to push gas toward the production wells. This is primarily due to the high compressibility of gases compared to liquids. Compressibility is how much a substance changes in volume when subjected to pressure changes.
The compressibility drive is the dominant mechanism in dry gas reservoirs, where water or other fluid influx is minimal. The reservoir's performance is strongly dependent on the ability of gas to expand, making it a crucial factor for understanding reservoir depletion, production forecasting, and recovery strategies.
Key Aspects of Compressibility Drive
