How to Calculate and Solve for Gas Pore Volume of a Reservoir Fluid Flow | The Calculator Encyclopedia

The image above represents the gas pore volume.

To compute for the gas pore volume, three essential parameters are needed and these parameters are Initial Gas FVF (Bgi), Initial Water Saturation (Swi) and Initial Gas in Place (G).

The formula for calculating the gas pore volume:

(PV)g = GBgi / 1 – Swi

Where;

(PV)g = Gas Pore Volume
Bgi = Initial Gas FVF
Swi = Initial Water Saturation
G = Initial Gas in Place

Let’s solve an example;
Find the gas pore volume when the initial gas FVF is 12, initial water saturation is 9 and initial gas in place is 13.

This implies that;

Bgi = Initial Gas FVF = 12
Swi = Initial Water Saturation = 9
G = Initial Gas in Place = 13

(PV)g = GBgi / 1 – Swi
(PV)g = 13 x 12 / 1 – 9
(PV)g = 156 / -8
(PV)g =  -19.5

Therefore, the gas pore volume is -19.5

Calculating the Initial Gas FVF when the Gas Pore Volume, Initial Water Saturation and Initial Gas in Place is Given.

Bgi = (PV)g (1 – Swi) / G

Where;

Bgi = Initial Gas FVF
(PV)g = Gas Pore Volume
Swi = Initial Water Saturation
G = Initial Gas in Place

Let’s solve an example;
Find the initial gas FVF when the gas pore volume is 19, initial water saturation is 11 and initial gas in place is 16.

This implies that;

(PV)g = Gas Pore Volume = 19
Swi = Initial Water Saturation = 11
G = Initial Gas in Place = 16

Bgi = (PV)g (1 – Swi) / G
Bgi = 19 (1 – 11) / 16
Bgi = 19 (-10) / 16
Bgi = -190 / 16
Bgi = -11.875

Therefore, the initial gas FVF is -11.875.

Calculating the Initial Water Saturation when the Gas Pore Volume, Initial Gas FVF and Initial Gas in Place is Given.

Swi = 1 – GBgi / (PV)g

Where;

Swi = Initial Water Saturation
G = Initial Gas in Place
(PV)g = Gas Pore Volume
Bgi = Initial Gas FVF

Let’s solve an example;
Find the initial water saturation when the initial gas FVF is 24, initial gas in place is 6 and gas pore volume is 46.

This implies that;

G = Initial Gas in Place = 6
(PV)g = Gas Pore Volume = 46
Bgi = Initial Gas FVF = 24

Swi = 1 – GBgi / (PV)g
Swi = 1 – 6 x 24 / 46
Swi = 1 – 144 / 46
Swi = 1 – 3.13
Swi = -2.13

Therefore, the initial water saturation is -2.13.

Continue reading How to Calculate and Solve for Gas Pore Volume of a Reservoir Fluid Flow | The Calculator Encyclopedia

How to Calculate and Solve for Gas Recovery Factor (Production) | Reservoir Fluid Flow

The image above represents a gas recovery factor (G).

To compute for a gas recovery factor (production), two essential parameters are needed and these parameters are cumulative gas production (GP) and initial gas in place (G).

The formula for calculating the gas recovery factor (G):

RFG = Gp / G

Where:

RFG = Gas Recovery Factor (G)
GP = Cumulative Gas Production
G = Initial Gas in Place

Let’s solve an example;
Find the gas recovery factor (G) when the cumulative gas production is 13 and the initial gas in place is 17.

This implies that;

GP = Cumulative Gas Production = 13
G = Initial Gas in Place = 17

RFG = Gp / G
RFG = 13 / 17
RFG = 0.764

Therefore, the gas recovery factor (G) is 0.764.

Calculating the Cumulative Gas Production when the Gas Recovery Factor (G) and the Initial Gas in Place is Given.

GP = RFG x G

Where;

GP = Cumulative Gas Production
RFG = Gas Recovery Factor (G)
G = Initial Gas in Place

Let’s solve an example;
Find the cumulative gas production when the gas recovery factor (G) is 24 and the initial gas in place is 6.

This implies that;

RFG = Gas Recovery Factor (G) = 24
G = Initial Gas in Place = 6

GP = RFG x G
GP = 24 x 6
GP = 144

Therefore, the cumulative gas production is 144.

Continue reading How to Calculate and Solve for Gas Recovery Factor (Production) | Reservoir Fluid Flow