4.5 Article

The hard-core effect on PC-SAFT to model asphaltene precipitation in petroleum reservoir fluids

Journal

FLUID PHASE EQUILIBRIA
Volume 563, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.fluid.2022.113590

Keywords

PC; SAFT; Hard-core; Second -order term; Effective diameter; Asphaltene onset pressure; Petroleum reservoir fluids

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In this work, a hard-core version of the PC-SAFT EoS was proposed and applied to predict asphaltene onset pressures, bubble points, and precipitated amounts for 18 real petroleum reservoir fluids. The results showed that the hard-core PC-SAFT model predicted lower onset pressures compared to other tested versions, and the asphaltene molecular weight used in the model directly affected the predicted onset pressures and precipitated amounts.
In this work, a hard-core version of the Perturbed Chain-Association Fluid Theory Equation of State (PC-SAFT EoS) is proposed and used to predict upper asphaltene onset pressures (AOPs), bubble points (BPs), and precipitated asphaltene amounts for eighteen real petroleum reservoir fluids around the world. As a result, for the same assumed asphaltene molecular weight (MW) value, this hard-core PC-SAFT model predicts lower AOPs than the other two PC-SAFT versions here tested, including the original version of PC-SAFT. The AOPs and precipitated asphaltene amounts are found to be directly related to the asphaltene MW values used for each PC-SAFT model. The hard-core PC-SAFT model here presented is the PC-SAFT version that requires the lowest asphaltene MWs and predicts the lowest precipitated asphaltene amounts for the eighteen fluids modeled.

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