Gas Reserves Gf
Gas Reserves
- Where:
- Gf= volumetric recoverable gas reserves in standard cubic feet (SCF)
- 43,560= area of 1 acre, in square feet
- A= drainage area in acres
- h= reservoir thickness in feet
- ɸ= porosity, decimal fraction
- Sh= hydrocarbon saturation (1.0 - Sw), decimal fraction
- RF= recovery factor
- Bgi= gas volume factor (in SCF/cu ft)
| Calculate Volumetric Producible Gas Reserves (Gf) | |||||||
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Results
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| Volumetric Producible Gas Reserves (Gf) - Results | |||||||
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| A (Acres) | h (ft) | ɸ (dec) | Sh (dec) | Bgi (SCF/CF) | FR (dec) | Gf (SCF) | |
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Gas Volume Factor (Bgi)
- Where:
- TSC= temperature (°F) at standard conditions
- PSC= PSC= surface pressure (psi) at standard conditions
- P= reservoir pressure (psi)
- Z=gas compressibility factor
- Tf= formation temperature (°F)
- Bgi = calculated by the ratio of surface and formation pressures
| Calculate Gas Volume Factor (Bgi) | |||||||
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Results
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| Gas Volume Factor (Bgi) - Results | ||||||
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| Tsc (°F) | Psc (psi) | P (psi) | Z | Tf (°F) | Bgi (SCF/CF) | |
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Other way to calculate producible gas reserves is by replacing the gas volume factor for a pressure ratio:
- Where:
- Gf= volumetric recoverable gas reserves in standard cubic feet (SCF)
- 43,560= area of 1 acre, in square feet
- A= drainage area in acres
- h= reservoir thickness in feet
- ɸ= porosity, decimal fraction
- Sh= hydrocarbon saturation (1.0 - Sw), decimal fraction
- RF= recovery factor
- Pf1= surface pressure (psi) (atmospheric, approximately 15 psi)
- Pf2= reservoir pressure (psi)
| Calculate Volumetric Producible Gas Reserves (Gf) | |||||||
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Results
| Volumetric Producible Gas Reserves (Gf) - Results | |||||||
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| A (Acres) | h (ft) | ɸ (dec) | Sh (dec) | Pf2/Pf1 (SCF/CF) | FR (dec) | Gf (SCF) | |
This pressure ratio is calculated the following way:
Pf2/Pf1 = (0.43 *
Depth) / 15
- Where:
- 0.43 = average pressure gradient (psi/ft) and depth is in feet.
| Calculate Gas Volume Factor (Bgi) | |||||||
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Results
| Gas Volume Factor (Bgi) - Results | ||
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| Depth (ft) | Pf2/Pf1 (SCF/CF) | |
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