You normally get the oil/water ratio from a retort so you can use these numbers to determine density oil and water mixture by the following formula.

**(V1)(D1) + (V2)(D2) = (V1 + V2)DF**

Where;

V1 = percentage of oil

V2 = percentage of water

D1 = density of oil

D2 = density of water

DF = final density of mixed fluid between oil and water

Example: If the oil/water (o/w) ratio is 80/20 (80% oil and 20% water), please determine the density of mixed fluid between oil and water from the retort. Oil density = 7.0 ppg. Water density = 8.33 ppg.

V1 = 0.8

V2 = 0.2

D1 = 7.0

D2 = 8.33

(V1)(D1) + (V2)(D2) = (V1 + V2)DF

(0.8)(7.0) + (0.2)(8.33) = (0.8 + 0.2) DF

5.60 + 1.67= 1.0 DF

7.27 = DF

The density of the oil/water mixture = 7.27 ppg

**Please the Excel sheet used to calculate the density of oil and water mixture.**

**Ref book: ** **Formulas and Calculations for Drilling, Production and Workover, Second Edition**