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Three Phase Modeling of Fluid Flow in the Well Tubing to predict Asphaltene Deposition

Mehdipour, Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50590 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahaboddin
  7. Abstract:
  8. In this thesis, by focusing on the hydraulics of three phase flow in vertical tubing to investigate asphaltene deposition problem, the solid particles behaviors in a turbulent flow is fully studied. Reasonable size distribution for particles (based on previous works and researches) was assumed and a model for 2 sections of a Marrat oil field well to evaluate their asphaltene deposition problem was developed. Three phase liquid-gas-solid flow in the well tubing was simulated. Asphaltene deposition profile on the well tubing, mean and maximum of the deposition rate and particle concentrations in the flow regime were calculated and compared with real field data. Better agreement with field data compared to other models was achieved, especially the trend and the shape of depositions in the tubing. The effects of particle size, production flow rate, gas volume fraction on deposition were investigated. The particle size of 100 nm showed the minimum amount of deposition rate. As the speeds goes up, the particle trajectories change so less particles reach the wall, for example by doubling the speed, we observed less than double deposition rate. Gas has the same effect but more intense, as we inject 10% of gas, we saw 13% of reduction in deposition rate. In a separate part, we have discussed the reasons of “why particles cease to deposit after bubble pressure?” the field results indicating the severe loss in deposition after bubble point were precisely observed in the model and the new deposition profiles are presented. The results reveal that 90% of deposition rate will be vanished in 15 cm away from the bubble point depth. At last, we presented some ideas to improve the model in the future
  9. Keywords:
  10. Turbulent Flow ; Asphaltene Deposition ; Fluent Software ; Particles Tracking ; Three Phase Liquid-Gas-Solid Flow

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