EFFECT OF OIL TEMPERATURE ON THE WAX DEPOSITION OF CRUDE OIL WITH COMPOSITION ANALYSIS

• Main Authors: Qing Quan, Wei Wang, Pengyu Wang, Juheng Yang, Ge Gao, Lu Yang, Jing Gong
• Format: Article
• Language: English
• Published: Brazilian Society of Chemical Engineering
• Series: Brazilian Journal of Chemical Engineering
• Subjects: Wax deposition; Molecular diffusion; Incipient gel layer; Crude oil
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322016000401055&lng=en&tlng=en

Abstract Wax deposition behavior was investigated in a set of one-inch experiment flow loops, using a local crude oil with high wax content. The temperature of the oil phase is chosen as a variable parameter while the temperature of the coolant media is maintained constant. Detailed composition of the deposit is characterized using High Temperature Gas Chromatography. It was found that the magnitude of the diffusion of the heavier waxy components (C35-C50) decreases when the oil temperature decreases, but the magnitude of the diffusion of the lighter waxy components increases. This result means that the diffusion of wax molecules shifts towards lower carbon number, which further proves the concept of molecular diffusion. Meanwhile, a meaningful phenomenon is that the mass of the deposit increases with the oil temperature decrease, which definitely proves the influence of wax solubility on deposition, while the formation of an incipient gel layer reflects the fact that an increase in the mass of the deposit does not mean a larger wax percentage fraction at lower oil temperature.