Petroleum Goodies: API Gravity

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API Gravity Posted: 26 Feb 2011 08:27 AM PST API To Specific Gravity Calculation This is not brand new formula but very handy calculation to have. API Gravity = ( 141.5 / Specific Gravity ) – 131.5 Specific Gravity = 141.5 / ( 131.5 + API ) Example: pure water at 60 deg F with  a specific gravity of 1.0 would have an API gravity: API Gravity = ( 141.5 / 1.0 ) – 131.5 = 10 deg API Degree API Specific Gravity 10 1.000 15 0.966 20 0.934 25 0.904 30 0.876 35 0.850 40 0.825 45 0.802 50 0.780 55 0.759 60 0.739

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Calculate Gas Compressibility

This Excel function calculates gas compressibility (Z factor) for natural gases based on equation of state from Dranchuk and Abou-Kassem.

This tool also includes intermediate calculation such as calculating pseudocritical pressure and temperature.

References:

1. Dranchuk, P.M., and Abou-Kassem, J.H.: “Calculation of Z Factors For Natural Gases Using Equations of State,” J. Cdn. Pet. Tech. (July-Sept., 1975) 34-36.


2. “Theory and Practice of Testing Gas Wells”, 3rd. Edition (1975) Energy Resources Conservation Board 603 6th. Ave. S.W. Calgary, Alberta, Canada.

Use VBA macro? Yes

Calculate Gas Compressibility

[File size: 21.3 KiB - Hits: 305 - Type: Excel file in zipped folder]