Study determines best methods for calculating acid-gas density

A study on predicting acid-gas densities for the pressure and temperature ranges relevant to acid-gas injection schemes found that only one common equation of state gave unsatisfactory results.Studied were the Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), Patel-Teja (PT) equations as well as the effect of volume shifting on the SRK and PR equations. The study included pure hydrogen sulfide (H2S) and carbon dioxide (CO2) and mixtures of the two.The study found that SRK equation was unsatisfactory for predicting densities over the entire range of conditions because errors for this equation were often greater than 10%.The volume-shifted SRK is marginally satisfactory. The volume-shift drama...

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