1. Properties of crude oil
Fundamentals of Petroleum Engineering
By: Bilal Shams Memon
Properties of crude oil

2. API Gravity (Degrees) = (141 .5/Sp. Gr.) – 131 .5
API – American Petroleum Institue.
API gravity – a measure of oil density; related to specific gravity by following formula:
API Gravity (Degrees) = (141 .5/Sp. Gr.) –
API gravity determines crude oil worth.
10⁰Api = 1 Sp. Gr.
Less dense oil (higher API gravity); being the most valuable.

3. 2. Bubble point pressure
Pressure at which first gas is liberated from the reservoir oil upon isothermal pressure reservoir temperature.
‘Pb’ (saturation pressure)

4. 3. Formation volume factor
Reservoir volume occupied per volume of tank oil and its dissolved gas.
‘Bo’.
This quantity is always greater than 1.

5. 4. Solution gas oil ratio
Number of standard cubic feet of gas dissolved per barrel of tank oil.

6. 5. Oil viscosity
‘µo