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Smart Design of Viscoelastic Diverters for Carbonate Matrix Acidizing

Mohammad Alipour, Mahdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54418 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bazargan, Mohammad; Jamshidi, Saeed
  7. Abstract:
  8. One of the best stimulation methods for oil and gas wells is matrix acidizing in order to increase the near wellbore permeability. in acidizing, good acid coverage in different layers is one the main goals. so, various methods have been presented. important part in using these methods is to not damage formation and economic matters. modern methods utilize VES acids for this purpose. viscoelastic characteristics of these materials by formation of miscellaneous, increases the apparent viscosity by a large degree. for this reason, VES fluids can be used to improve acid divergence in acid injection operation. acid system based on viscoelastic surfactants that is changed to gel instantly, can be prepared by adding this material. after acid reaction with carbonate rock, pH increases and causes surfactants molecules to from long miscellaneous rods that increase solution viscosity significantly. in order to break gel, miscellaneous rods gave to be changed to sphere miscellaneous, which happens at higher ph. so, acid based on viscoelastic surfactants can be cleaned easily in respect to gel acids and produce higher permeability. In this research, we are going to inspect common methods for acidizing and diverters in the well. then, based on KIMIA method, design of acid and VES will be conducted, and compared to common models. also, we are going to evaluate KIMIA method and present better VES from rheological point of view
  9. Keywords:
  10. Reservoirs Acidizing ; Carbonate Resrevoirs ; Viscosity ; Viscoelastic Surfactant (VES) ; Matrix Acidizing ; Viscoelastic Diverting Acid

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