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Phase Behavior and ThermodynamicsPVT PropertiesCalculation record

Average Compressibility of Oil Calculator

Co=−1V(V1−V2p1−p2)C_o = -\frac{1}{V}\left(\frac{V_1 - V_2}{p_1 - p_2}\right)

Enter the declared phase behavior and thermodynamics inputs below to solve C_o. Variable definitions, units, the default calculation, and the available source trail are included on this page.

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Inputs

Defaults provide a quick field-unit example for the equation.

5 variables

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Extended guidance in preparation

What is available in this record

This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.

Formula reference

Formula, variables, and default calculation

Co=−1V(V1−V2p1−p2)C_o = -\frac{1}{V}\left(\frac{V_1 - V_2}{p_1 - p_2}\right)

Reproducible default result

With the default values shown below, the calculation returns C_o = 0.00002 1/psi. Defaults demonstrate the implementation; they are not recommended field values.

Vfraction

1

V_1fraction

0.98

V_2fraction

1

p_1psi

4000

p_2psi

3000

Input definitions

V

fraction

Reference Volume

V_1

fraction

Volume Fraction at Higher Pressure

V_2

fraction

Volume Fraction at Lower Pressure

p_1

psi

Higher Pressure

p_2

psi

Lower Pressure

Output definitions

C_o

1/psi

Average Oil Compressibility

V

fraction

Reference Volume

V_1

fraction

Volume Fraction at Higher Pressure

V_2

fraction

Volume Fraction at Lower Pressure

p_1

psi

Higher Pressure

p_2

psi

Lower Pressure

Source and record status

Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.

reviewed

Craft, B.C., Hawkins, M. and Terry, R.E. 1991. Applied Petroleum Reservoir Engineering, 2nd Edition, Page 38.

Open source reference