Cubic EoS (Equations of State) are widely used throughout the industry, as they have extensive applicability and excellent accuracy for a wide range of fluid properties. As operating envelopes continue to be pushed, and cost control is becoming ever more stringent, Cubic EoS display some limitations in predicting accurate fluid properties such as compressibility, speed of sound, heat capacity, Joule-Thompson coefficients, etc. An evaluation using inaccurate fluid properties could potentially result in exceeding design pressures and incorrectly sizing critical specifications of facilities .
As an example, our analysis shows that “out of the box” thermodynamic and flow models can provide reasonable temperature predictions, but can occasionally over-predict pressure increases to a significant degree – compared to accurately measured field data. Manual corrections through established, standard methods allow the recovery of technical accuracy, but it is normally not practical from a commercial standpoint, and seldomly not applicable on a wider-scale.
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