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(P _{i}), initial compressibility factor (Z_{i}) **and

**P/Z Ratio (**

^{P}/_{Z}).The formula for calculating the gas recovery factor:

RF_{G} = 1 – ^{P}/_{Z}.^{Pi} / _{Zi}

Where;

RF_{G} = Gas Recovery Factor (P, Z)

P_{i} = Initial Pressure

Z_{i} = 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;

P_{i} = Initial Pressure = 12

Z_{i} = Initial Compressibility Factor = 7

^{P}/_{Z} = P/Z Ratio = 36

RF_{G} = 1 – ^{P} / _{Z}.^{Pi} / _{Zi}

RF_{G} = 1 – 36[^{12} / _{7}]

RF_{G} = 1 – 36[1.714]

RF_{G} = 1 – 61.714

RF_{G} = -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** – https://www.nickzom.org/calculator-plus

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 https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

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(P _{i}), initial compressibility factor (Z_{i}) **and

**P/Z Ratio (**

^{P}/_{Z}).Now, enter the value appropriately and accordingly for the parameter as required by the **initial pressure(P _{i})** is

**12**,

**initial compressibility factor (Z**is

_{i})**7**and

**P/Z Ratio (**is

^{P}/_{Z})**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.