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Experimental Investigation on the Performance of Preformed Particle Gel in Improving Oil Recovery by Low Salinity Water Injection in Heterogeneous Porous Media

Moshirpanahi Aliabad, Mohammad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52546 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfare, Mohammad Hossein; Fatemi, Mobin
  7. Abstract:
  8. Water production from high permeability regions such as fractures and channels in the reservoir can be considered as one of the problematic issues in oil production. In order to control water production, chemical methods such as polymer injection, surfactant injection, and foam injection are widely used, among all of them, Preformed Particle Gel (PPG) is the most efficient method.By injecting the preformed particle gel into the reservoir and blockage of fractures and high permeable regions, Injected water bypasses to the target zone. In this study, preformed gel with a unique formulation was synthesized by free radical polymerization method in the laboratory.Nano-Clay and Nano-Silica were utilized in gel synthesizing to improve gel mechanical resistance and for maximizing PPG swelling capacity cross-linker composition decreased. Instead of using TEMED as a polymerization reaction catalyst, the reactor heated at 40 ℃ which has promoted preformed gel mechanical resistance. Three types of experiments including: bulk tests, Hele-Shaw cell tests, and micro-model tests were performed on synthesized PPG. To investigate the kinetic and swelling capacity of pre-formed gel in different conditions of salinity, temperature, and pH the bulk experiments has been done. The effect of carbon dioxide, oil and formation water interactions, and dried gel particle size on gel swelling capacity has investigated, as well. Bulk experiments results showed that swelled preformed gel has a good durability in aqueous solutions and also at elevated temperatures. The gel optimum particle size that has the highest swelling capacity in seawater was obtained through bulk experiments. The preformed gel is stable in intense acidic and alkaline environment. Unlike the acidic medium, alkaline medium reduces the swelling capacity of the gel. Swelled preformed gel is stable, as long as it loses approximately 11% of its internal water in contact with carbon dioxide gas. So on, it could be used in projects which carbon dioxide has been injected after gel injection. The bulk tests results, stability and swelling capacity of gel particles with different sizes in Persian Gulf seawater and southern reservoir formation water and also in high acidic and alkaline environments, could be used in field application of gel injection Preformed gel plugging performance has been analyzed by measuring the breakthrough pressure, stabilized pressure and resistance factor in the semi-transparent Hele-Shaw cell. The effect of gel particle size, water salinity which used to swell the gel, and secondary injected water salinity on gel plugging performance has been investigated. Results shows that gel plugging performance has been improved by 67% compared to former synthesized gel sample synthesized gel performance in water cut reduction/ increasing oil production analyzed in fractured micro model in secondary low salinity water injection mode. The micro-model tests show that, by reducing fracture flow capacity, the preformed gel bypassed the water flow from fracture to matrix, consequently, the oil recovery significantly improved
  9. Keywords:
  10. Residual Resistance Factor ; Hele-Shaw Cell ; Performanced Particles Gels ; Gel Synthesis ; Oil-Formation Water ; Fractured Micromodel

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