How to Calculate and Solve for Crude Oil Gravity, Oil Density and Water Density | The Calculator Encyclopedia

July 5, 2019March 7, 2024 Loveth Idoko

Last Updated on March 7, 2024

To calculate the crude oil gravity, two essential parameters are needed and these parameters are oil density (ρ_o) and water density (ρ_w).

The formula for calculating the crude oil gravity:

γ_o = ^ρ_o / _{ρ_w}

Where;

γ_o = Crude Oil Gravity
ρ_o = Oil Density
ρ_w = Water Density

Let’s solve an example;
Find the crude oil gravity when the oil density is 28, and the water density is 46.

This implies that;

ρ_o = Oil Density = 28
ρ_w = Water Density = 46

That is γ_o = ^ρ_o / _{ρ_w}
γ_o = ²⁸ / ₄₆
γ_o = 0.608

Therefore, the crude oil density is 0.608.

Calculating the Oil Density when the Crude Oil Gravity and the Water Density are Given

ρ_o = γ_o x ρ_w

Where;

ρ_o = Oil Density
γ_o = Crude Oil Gravity
ρ_w = Water Density

Let’s solve an example;
Find the oil density when the crude oil gravity is 30 and the water density is 16.

This implies that;

γ_o = Crude Oil Gravity = 30
ρ_w = Water Density = 16

So, ρ_o = γ_o x ρ_w
ρ_o = 30 x 16
ρ_o = 480

Therefore, the oil density is 480.

Calculating the Water Density when the Crude Oil Density and the Oil Density are Given

ρ_w = ρ_o / γ_o

Where;

ρ_w = Water Density
γ_o = Crude Oil Gravity
ρ_o = Oil Density

Let’s solve an example;
Find the water density when the oil density is 32 and the crude oil gravity is 12.

This implies that;

γ_o = Crude Oil Gravity = 12
ρ_o = Oil Density = 32

ρ_w = ^ρ_o / _{γ_o}
So, ρ_w = ³² / ₁₂ρ_w = 2.667

Therefore, the water density is 2.667.

How to Calculate Crude Oil Gravity Using The Calculator Encyclopedia

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the crude oil gravity.

To get the answer and workings of the crude oil gravity 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 Fluid Properties under Petroleum

Now, Click on Crude Oil Gravity under Fluid Properties

The screenshot below displays the page or activity to enter your values, to get the answer for the crude oil gravity according to the respective parameters which are the oil density (ρ_o) and water density (ρ_w).

Now, enter the values appropriately and accordingly for the parameters as required by the oil density (ρ_o) is 28 and water density (ρ_w) is 46.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the crude oil gravity and presents the formula, workings and steps too.