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

The image above represents a gas recovery factor.

To compute for the gas recovery factor, three essential parameters are needed and these parameters are initial pressure(Pi), initial compressibility factor (Ziand P/Z Ratio (P/Z).

The formula for calculating the gas recovery factor:

RFG = 1 – P/Z.Pi / Zi


RFG = Gas Recovery Factor (P, Z)
Pi = Initial Pressure
Zi = Initial Compressibility Factor
P/Z = P/Z Ratio

Let’s solve an example;
Find the gas recovery factor when the initial pressure is 12, the initial compressibility factor is 7 and the P/Z ratio is 36.

This implies that;

Pi = Initial Pressure = 12
Zi = Initial Compressibility Factor = 7
P/Z = P/Z Ratio = 36

RFG = 1 – P / Z.Pi / Zi
RFG = 1 – 36[12 / 7]
RFG = 1 – 36[1.714]
RFG = 1 – 61.714
RFG = -60.714

Therefore, the gas recovery factor is -60.714.

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the gas recovery factor.

To get the answer and workings of the gas recovery factor using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

Web –

To get access to the professional version via web, you need to register and subscribe for NGN 1,500 per annum to have utter access to all functionalities.
You can also try the demo version via

Android (Paid) –
Android (Free) –
Apple (Paid) –
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Petroleum under Engineering

Now, Click on Reservoir Fluid Flow under Petroleum

Now, Click on gas recovery factor under Reservoir Fluid Flow

The screenshot below displays the page or activity to enter your value, to get the answer for the gas recovery factor according to the respective parameter which are the initial pressure(Pi), initial compressibility factor (Ziand P/Z Ratio (P/Z).

Now, enter the value appropriately and accordingly for the parameter as required by the initial pressure(Pi) is 12, initial compressibility factor (Zi) is 7 and P/Z Ratio (P/Z) is 36.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the gas recovery factor and presents the formula, workings and steps too.

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