Methods For Predicting Asphaltene Precipitation

A method predicts the asphaltene precipitation envelope of a fluid consisting of stock tank oil and dissolved gas. The method comprises comparing a solubility parameter of the fluid, δfluid, and an onset solubility parameter of the fluid, δonset(fluid), across a range of pressures, to predict pressu...

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Bibliographische Detailangaben
Hauptverfasser:	Balashanmugam Soban, Haghshenas Mehdi, Gonzalez Doris, Totton Timothy
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method predicts the asphaltene precipitation envelope of a fluid consisting of stock tank oil and dissolved gas. The method comprises comparing a solubility parameter of the fluid, δfluid, and an onset solubility parameter of the fluid, δonset(fluid), across a range of pressures, to predict pressures at which asphaltene precipitation will be observed, δfluid and δonset(fluid) are calculating using a correction factor, Fcorrection. Fcorrection is determined according to formula (1): Fcorrection=δSTO(physical)/δSTO(solvent power) (1) where: δSTO(physical) is an estimate of the solubility parameter of the stock tank oil based on a physical property of the stock tank oil, and δSTO(solvent power) is an estimate of the solubility parameter of the stock tank oil based on the solvent power of the stock tank oil.