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Numerical and Experimental Analysis of Fiber-Reinforced Elastomeric Cylinder in Inflation and Deflation Process

Zarandi, Mohammad Hossein | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54847 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani Hadi, Jamal
  7. Abstract:
  8. One of the most important tools in industries such as oil, gas, mining and groundwater is inflatable packers. These tools are used for plugging and zonal isolation of a well. The most important member of this cylindrical tool is the elastomer, which is reinforced by metal wire ropes. These cables are placed at an angle relative to the axis of the cylinder and are wound in a helix shape. At both ends of the tool are rings that hold the cylinder. After running the tool into the well and placed in the desired position, by a pipe connected to it, fluid is pumped into it. This increases the diameter or inflation of the tool, and the outer skin of the elastomeric cylinder contacts the well and puts pressure on it. In this case, the two sides of the tool are sealed relative to each other. If force or pressure difference is applied on both sides of the tool, the frictional force between the well and the elastomeric cylinder prevents the tool from slipping. At the end of the operation, the inflation pressure of the packer is discharged and deflation occurs and the elastomeric cylinder returns to its original shape.Important parameters of this tool such as angle of reinforcements, contact pressure, force of reinforcements, stress in end-rings and locking phenomenon are done with the help of analytical relations and numerical simulation. Rebar method has been used to simulate the reinforcements. Finally, the experimental study of this tool is performed. To do this, the tool is manufactured and tested by TOMEX company. The first test was unsuccessful due to the improper angle of the reinforcements. The second test was performed successfully, which was in good agreement with the analysis and simulation.The results show that as the diameter of the cylinder increases due to internal pressure, the reinforcements rearrange and their angle increases. As the initial angle of the reinforcements increases, the force of the reinforcements increases and the contact pressure and stress in the rings decrease.
  9. Keywords:
  10. Inflatable Packer ; Fiber Reinforced Elastomeric Isolators ; Sealing Element ; Fiber-Reinforced Elastomer

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