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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:
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.
“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
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