Dranchuk-Abou-Kassem Gas Z-Factor Calculator
Natural Gas Thermodynamics: Calculate gas compressibility factor ($Z$), pseudo-reduced properties ($P_{pr}, T_{pr}$), and gas FVF ($B_g$) using the DAK EOS.
Reservoir Pressure & Temperature
Gas Specific Gravity & Impurities
Z-Factor & Thermodynamic Output
Compressibility Factor ($Z$)
--
Reduced Density ρ_pr: --
Gas FVF ($B_g$)
-- rcf/scf
In rb/scf: --
Pseudo-Reduced State
P_pr: -- / T_pr: --
P_pc: -- psia / T_pc: -- °R
In-Situ Gas Density ($\rho_g$)
-- lb/ft³
Expansion E_g: -- scf/rcf
DAK Formulation & Wichert-Aziz:
• DAK solves the modified Benedict-Webb-Rubin (BWR) 11-constant EOS for reduced gas density $\rho_{pr}$.
• Sour gas impurities ($CO_2, H_2S$) are corrected via Wichert-Aziz pseudo-critical temperature drop factor $\epsilon$.
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