Loading...

Study the Rheological Behavior and the Pour Point Waxy Crude Oil

Farrokhpey, Faeze | 2016

752 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48494 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Sirus; Jafaribehbahani, Tarane; Khorashe, Farhad; Ramezani saadat abadi, Ahmad
  7. Abstract:
  8. Wax deposition crude oils, with high pour point causes, many problems arise in production, transfer and storage. In this project, wax appearance temperature of three samples of crude oil caculated, using techniques viscometer. Maximum absolute error on oil.no2 was with a value of 0.559% and the results had in good agreement with experimental data. By using the rheometer MCR301, for three crude oil samples, steady shear tests and sweep time tests was done. Flow diagrams were obtained. According to wax appearance temperature (WAT) of each samples, diagrams shear stress versus shear rate are nonlinear at low temperatures than WAT. Crude oil shows non-newtonian behavior. Arrhenious model, Power-law model and Dekee-Turcotte model were fitted on experimental data that among these rheological models, Dekee-Turcotte model, had a correlation coefficient greater.For three samples of crude oils, thermodynamic modeling was calculated to predict, wax appearance temperature and the amount of deposition, at low temperatures than WAT.For each sample of crude oils, parameters of PR equation of state, for wax phase were tuned and the modeling results were compared with Pedersen model. In proposal model, for temperatures below than WAT, always number of solid phase is one and characteristics of the system, instead, optimization molecular weight last psuedocomponent, to be perfectly, systematic SARA test results were used, except for oil.no1, PR equation more accurate estimate of WAT was obtained. Most of diversion, was as to oil.no1 with deviation of mean, 15.48% and minimum deviation was for oil.no2, 4.87%
  9. Keywords:
  10. Wax Percipitation ; Waxy Crude Oil ; Pour Point ; Rheological Behavior

 Digital Object List

 Bookmark

No TOC