The image above represents the gas FVF.

To compute for the gas FVF, three essential parameters are needed and these parameters are **Z-Factor (Z), Temperature (T) and Pressure (P)**.

The formula for calculating the gas FVF:

B_{g} = 0.00504[^{ZT} / _{P}]

Where;

B_{g} = Gas FVF

Z = Z-Factor

T = (°R) Temperature

P = Pressure

Let’s solve an example;

Find the Gas FVF when the Z-Factor is 12, temperature is 30 and the pressure is 120.

This implies that;

Z = Z-Factor = 12

T = (°R) Temperature = 30

P = Pressure = 120

B_{g} = 0.00504[^{ZT} / _{P}]

B_{g} = 0.00504[^{12 x 30} / _{120}]

B_{g} = 0.00504[^{360} / _{120}]

B_{g} = 0.00504[3]

B_{g} = 0.01512

Therefore, the **gas FVF **is **0.01512 ^{bbl} / _{scf}.**

**Calculating for the Z-Factor when the Gas FVF, Temperature and Pressure is Given.**

Z = ^{Bg.P} / _{0.00504T}

Where;

Z = Z-Factor

B_{g} = Gas FVF

T = (°R) Temperature

P = Pressure

Let’s solve an example;

Find the Z-Factor when the Gas FVF is 22, temperature is 16 and the pressure is 80.

This implies that;

B_{g} = Gas FVF = 22

T = (°R) Temperature = 16

P = Pressure = 80

Z = ^{Bg.P} / _{0.00504T}

Z = ^{22 x 80} / _{0.00504 x 16}

Z = ^{1760} / _{0.08064}

Z = 21825.39

Therefore, the **Z-Factor **is **21825.39.**

**Calculating for the Temperature when the Gas FVF, Z-Factor and the Pressure is Given.**

T = ^{Bg.P} / _{0.00504Z}

Where;

T = (°R) Temperature

Z = Z-Factor

B_{g} = Gas FVF

P = Pressure

Let’s solve an example;

Find the Temperature when the Gas FVF is 44, Z-Factor is 29 and the pressure is 70.

This implies that;

Z = Z-Factor = 29

B_{g} = Gas FVF = 44

P = Pressure = 70

T = ^{Bg.P} / _{0.00504Z}

T = ^{44 x 70} / _{0.00504 x 29}

T = ^{3080} / _{0.14616}

T = 21072.79

Therefore, the **temperature **is **21072.79.**