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The Investigation of Thermal and Rheological Properties of Hydrophobically Modified Polymer of Acrylamide

Shahin Varnousfaderani, Ali | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54140 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. Among chemically enhanced oil recovery (CEOR) methods, polymer flooding has the highest commercial potential. However, the most widely used conventional polymers such as partially hydrolyzed polyacrylamide (HPAM) are not applicable for high-temperature and high-salinity reservoirs. To overcome above-mentioned problems, in this work, a series of water-soluble hydrophobically modified polymers (HMPs) nanostructures comprising 2-vinyl naphthalene (hydrophobic monomer) has been produced by freestyle method (without Surfactant), micellar (with Surfactant). The size of the particles was investigated using scanning electron microscopy (FE-SEM) and optical scattering (DLS). Results from FT-IR spectroscopy were demonstrated the polymerization. Molecular weights of samples were quantified by measurement of intrinsic viscosity. Results were shown that 2-vinyl naphthalene monomers were dispersed randomly in freestyle polymerization, and in micellar polymerization, it was multiblock. Viscosities of solutions that are containing copolymers were increasing hydrophobic part. Rheology tests were studied to examine the relation between aqueous solution and microstructure comprising copolymers' intrinsic viscosity. Increasing in viscosity was shown by increasing copolymer and salt concentration. By growing the temperature and shear rate viscosity was decreased, indicating that shear-thinning behavior was detected at the presence of shear rate. Interchain networks of 2-vinyl naphthalene associations influenced viscosity properties. Outcomes showed a sensible relation among property of samples and microstructure.Meanwhile, the molecular weight of the freestyle sample was more than the micellar sample. It was delivered the best viscosity and rheological behavior. The result of hydrophilic monomer(AMPS) in terpolymer acrylamide/ 2-vinyl naphthalene/ 2-acrylamide-2- methyl propane sulfonic acid was as well considered. The viscosity of the new terpolymer in the non-salinity soluble is much higher than other copolymers. Moreover, by increasing temperature, it shows thermal stabilization due to the sulfonate group of the hydrophilic monomer
  9. Keywords:
  10. Enhanced Oil Recovery ; Polymer Flooding ; Hydrophobically Modified Polymers (HMPs) ; Rheology ; Micellar Polymerization ; 2-Acrylamido-2-Methylprppane Sulfonic Acid

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