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Experimental Analysis and Modeling of Crude Oil Viscosity at Downhole Conditions Using the Frtiction Theory

Fallahi, Majid | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52605 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Taghikhani, Vahid
  7. Abstract:
  8. Viscosity is one of the most important properties used in simulating and optimizing transportation design and hydrocarbon reservoirs simulation. In this work, a new model based on the friction theory was used to correlate the viscosity for six different live and dead oil samples taken from the south of the Iranian oil region. As expounded by other researchers, in the friction theory, an equation of state is used to express the intermolecular viscous interactions. In model presented in this work, the standard cubic equations of state such as the SRK and PR were used to correlate the viscosity data for the samples under investigation. In the new model, the effect of critical viscosity on the viscosity data was improved by introducing a new critical viscosity coefficient used in the friction theory. As a matter of fact, the original critical viscosity coefficient was split up into two explicit terms, i.e., KCa, denotes the critical viscosity coefficient at pressures above the bubble pressure and KCb, denotes the critical viscosity coefficient at pressures below the bubble pressure. The above two parameters could make the viscosity model more predictable comparing the original one. Also, the asymmetry parameter used in f-theory was optimized based on minimizing the average of absolute deviations. The results obtained from the new model in correlating the viscosity data were more accurate than those obtained from the original model. In addition, the new model was employed to correlate and predict the viscosity of oil samples in a wide range of viscosity ranging from 1 to 1000 cp. At the end, the results obtained from our new method were compared to the results of LBS and CSP methods
  9. Keywords:
  10. Lohrenz-Bray-Clark Method ; Frictional Viscosity ; Corresponding States Principle ; Linear Regression ; Nonsymetry ; Friction Theory

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