# McCain Oil density correlation

From wiki.pengtools.com

## Contents

## McCain Oil density correlation

**McCain correlation** is an empirical correlation for the **oil density** published in **1995** ^{[1]}.

## Math & Physics

Pseudoliquid density:

Apparent liquid density:

Next pseudoliquid density^{[2]}:

Iterate until pseudoliquid densities are equal.

Next adjust density to the pressure of interest:

where

Adjust density to the temperature of interest:

where

Oil density above the bubble point pressure:

## Example. Calculation of the oil density

Example source ^{[3]}

### Input data

- = 53.24 sm3/sm3
- = 0.85 or 35 API
- = 0.75
- = 90C or 363K
- = 10 MPa

Calculate oil density at p = 10 MPa?

### Solution

- = 749.645 kg/m3

The solution is available in the online PVT calculator software model at www.pengtools.com

## Application range

Description of the Data Used^{[1]}:

Number of data sets = 684

## Nomenclature

- = oil compressibility, 1/psia
- = pressure, psia
- = solution gas-oil ratio, scf/stb
- = gas specific gravity, dimensionless
- = gas specific gravity at separator pressure, dimensionless
- = oil specific gravity, dimensionless
- = temperature, °F

- = apparent density of surface gas if it were a liquid, lb
_{m}/ft^{3} - = liquid density at the bubble point pressure, lb
_{m}/ft^{3} - = liquid density at reservoir pressure and 60°F, lb
_{m}/ft^{3} - = oil density, lb
_{m}/ft^{3} - = pseudoliquid formed by recombination of surface gas and liquid at standard conditions, lb
_{m}/ft^{3} - = adjustment to liquid density due to pressure, lb
_{m}/ft^{3} - = adjustment to liquid density due to temperature, lb
_{m}/ft^{3}

### Subscripts

- b - bubble point
- g - gas
- o - oil

## References

- ↑
^{1.0}^{1.1}McCain, W.D. Jr.; Hill, N. C. (1995). "Correlations for Liquid Densities and Evolved Gas Specific Gravities for Black Oils During Pressure Depletion".*Society of Petroleum Engineers*(SPE-30773-MS). - ↑ McCain, W.D. Jr. (1990).
*Properties of Petroleum Fluids*(2 ed.). Oklahoma: PennWell Corp. ISBN 978-0878143351. - ↑
Wolcott, Don (2009).
*Applied Waterflood Field Development*. Houston: Energy Tribune Publishing Inc.