Determination of asphaltene precipitation using a new CPA-based equation of state. (16th February 2017)

• Record Type: Journal Article
• Authors: Taherian, Z.; Sefti, M. Vafaie; Shadman, M. M.; Zare Talavaki, M.; Afsharpour, A.; Veisi, S.
• Is Part Of: Petroleum science and technology. Volume 35:Number 4(2017)
• Page Start: 377
• Page End: 384
• Publication Date: 2017-02-16
• Subjects: Asphaltene precipitation -- attractive term -- CPA equation of state -- modeling -- thermodynamic; Liquid fuels -- Periodicals; Petroleum -- Periodicals; 665.505
• DOI: 10.1080/10916466.2016.1256897
• Languages: English
• ISSNs: 1091-6466

Abstract

ABSTRACT: Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. Therefore, predicting asphaltene phase behavior through thermodynamic modeling may help to control its precipitation and reduce the associated problems. In this work, a new modified cubic-plus-association (CPA) equation of state (EoS) was used to model asphaltene precipitation. This equation is based on a combination of a new physical part and an association term. The new physical part has an evolved cubic equation of state with a new attractive term in this work. The results of the new modification of CPA EoS were compared with the experimental data of two oil samples (oil samples 1 and 2) that belonged to Moradi et al. The results showed that this modified CPA EoS can predict asphaltene precipitation with good accuracy.