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Preparation of Polyacrylamide Nanoparticle with Nanoscale Coating to Control Solubility of Polymer during Polymer Flooding Process

Tamsilian,Yousef | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42341 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramezani Saadat, Ahmad
  7. Abstract:
  8. Hydrophilic polymers are widely used in enhanced oil recovery (EOR) processes to increase water viscosity during polymer flooding. However, these polymers increase the viscosity of injected water in undesirable strands, before reaching considerable positions that make some problems in polymer flooding process such as thermal, mechanical, bacterial degradation, surface absorption and undesirable plugging. In this study, a novel core-shell structure of polyacrylamide as an active polymer and nanoscale coating polystyrene as a shell polymer was designed and prepared to intelligently control mobility ratio in oil reservoirs and overcome weakness and limitations of classical polymer flooding. Inverse emulsion polymerization was applied to synthesize high molecular weight polyacrylamide (core polymer) and polystyrene as intelligent coat in hydrophobic media which was approached for oil fields. This intelligent structure released polyacrylamide in oil-water interface where polystyrene coat was solved and caused to increase water viscosity. As a result, active materials penetrated to porosity media and recovered regions were plugged by polymer solution. This process hindered fingering phenomena in underground reservoirs. Due to design of experiments and getting an appropriate pattern for this process, statically methods were used, including Response Surface Methodology , Average Effects pht, Taguchi and optimization genetic algorithm. Morphological, chemical, thermal properties of produced composite were investigated using scanning electron microscopy images, Infra-Red spectroscopy; Nuclear Magnetic Resonance spectroscopy; Energy-Dispersive X-ray spectroscopy; Ultraviolet , and Differential Scanning Calorimetry , respectively. These results revealed a core-shell structure for produced particles with considerable interaction of two polymers and the structure was prepared in nonascale core particle (123 nm) and shell (25-35 nm).In this way, all of monomers were reacted in synthesis environment and in order to Infera-Red results; the obtained peaks of core-shell structure were similar to pure polystyrene peaks because of presence of polystyrene coating. Furthermore, the release potential of the mentioned system in oil-water mixture was investigated at high temperature (90 C) by simulation of realistic conditions in underground reservoirs and experimental micromodel, including suitable porosity, and effects of intelligent release of polyacrylamide particles on water viscosity was measured by Ubbelohde viscometer. The adopted results show that this system has necessary ability for carrying polyacrylamide at oil-water interface and releasing it in front water. Whereas, the release of polymeric solution was increased with time in accordance with organophilic layer which was faced oil-water interface and solved in organic phase. So, recovered pores were blocked by active polymer and cause to increase recovery factor percent in enhanced oil recovery process
  9. Keywords:
  10. Polyacrylamid ; Polymer Flooding ; Core-Shell Structure ; Oil Recovery ; Emulsion Polymerization ; Watery Phase Viscosity

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