Calculate Gas Reserves Gf

💻 Optimized Version 📱

List of equations assignment

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
• Bbgi= gas volume factor (in SCF/cu ft)

Calculate Volumetric Producible Gas Reserves (Gf)
A: Acres		h: pies
ɸ: Decimal		Sh: Decimal
Bgi: SCF /cubic ft		FR: Decimal

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)
Tsc: °F		Psc: psi
P: psi		Z:
Tf: °F

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)
A: Acres		h: ft
ɸ: Decimal		Sh: Decimal
Pf2/Pf1: SCF / cubic ft		FR: Decimal

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) - Pressures
Depth: ft

Made by Henry Herrera