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Experimental Investigation and Modeling of Nonorganic Scale Formation in Porous Media at Microscopic Scale

Mirzaalian Dastjerdi, Ali | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52735 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahabodin; Taghikhani, Vahid
  7. Abstract:
  8. Inorganic scale deposition has been found to affect many industrial processes,including water injection into the oil reservoirs. Major formation damage because of incompatibility of high sulfate ion content of seawater with formation water containing calcium ion results in formation damage and production decline.In this study, several simultaneous techniques are utilized for qualitative and quantitative analysis of calcium sulfate scale to get more insight into the damage of formation during smart water flooding at micro and Nano scales. In the experimental section, calcium sulfate deposition due to the mixing of the formation water and seawater samples was investigated using the dynamic quartz crystal microbalance technique (DQCM). The effect of sulfate and magnesium ions existing in the seawater on the amount of calcium sulfate deposition were studied, individually. The results showed that the sulfate concentration of seawater could significantly change the mass deposition in a specific range. Also,at an optimal concentration of the magnesium ions, the total amount of calcium sulfate deposition decreased by sixty percent. However, magnesium ions could not decrease the nucleation rate of the initial stage. The results also revealed that small changes were observed in both the amount of deposition and the time of initial stage beyond five-time diluted seawater. In addition, the linear slope of the second stage of deposition for the mixture of formation water and five-fold diluted seawater decreased by ninety-two percent compared to the original seawater. To verify this, molecular dynamics simulation method was used to compare the simulation results with the experimental data. Likewise, the results obtained from the simulation model showed that at an optimal concentration of the magnesium ions in the seawater, the amount of calcium sulfate deposition was noticeably decreased
  9. Keywords:
  10. Formation Damage ; Molecular Dynamic Simulation ; Low Salinity Water Flooding ; Quartz Crystal Microbalance (QCM)Experiments ; Inorganic Sediments

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