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Analysis of Creep Behavior and Stability of Underground Fuel Storage in Rock Salt

Narimani, Mohammad Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50551 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammadhosein
  7. Abstract:
  8. The purpose of this study is to analyze the stability and creeping behavior of rock salt in underground gas and oil reservoirs. Preparation of natural salt caverns and operating them can manipulate the initial state of previously existed stress and to produce deviatoric stresses around the cavern. New state of stress and with creeping behavior of rock salt, causes a significant decrease in cavern’s volume and damages the surrounding area. Reduction of internal minimum pressure of cavern, increases the intensity of mentioned problems. Geometrical characteristics of cavern can also be significantly effective in the magnitude of damages around the reservoir. For instance, Deflection of cavern from the original spherical state, increases the damage. therefore, it’s important to design the optimum internal pressure of cavern to increase the stability of cavern. In this research, in orer to evaluate the mechanical behavior of rock salt, rock salt of Garmsar has been used, as no actual samples of gas and oil reservoirs of Iran were accessible. In order to assess the creeping behavior in rock salt, we need a behavioral model to observe the interactions and behaviors facing consistent stresses. Any of these models, include parameters that are extracted from creeping tests on rock salts. In order to achieve the aims of this project, samples have been provided from the mentioned area and have been tested and after the behavioral models and including parameters have been determined, considering the mechanical characteristics of rock-salts, slope stability analysis method and pressure arch concept have been used to determine the optimal shape of gas reservoir. numerical analysis has been done using FLAC 3D software considering injection and extraction cycles cavern for 10 years. Results of numerical modeling include minimum and maximum operational pressure of injected gas in reservoir, optimum shape of cavern, displacements or the decrease in cavern volume and it's safety factor in operated years
  9. Keywords:
  10. Rock ; Salts ; Creep Behavior ; Numerical Modeling ; Underground Reservoirs

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