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Numerical Investigation of Geometrical and Material Parameters Effect on Inflation and Deflation of oil well Inflatable Packers

Eftekhari, Ahmad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50853 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani Hadi, Jamal
  7. Abstract:
  8. Inflatable packers have a great value in downhole operations due to their unique ability to expand to several times their initial diameter. These type of packers have a sealing element. This element is constructed of thin overlapped sheet metal ribs which are surrounding an inner tube. These overlapped ribs protect inner tube against the extrusion. The outer surface of this element covered by a layer of rubber. The outer elastomeric cover seals the annulus of the casing and isolates the zones in the well. In this study, some of the geometrical and material parameters effects on inflation and deflation of inflatable packers are investigated by numerical method. At first, for this purpose, the general structure of this packer and some material characteristics of rubbers such as hyperelasticity, viscoelasticity, Mullins effect and permanent-set have been reviewed. In the following section the slipping of packer was examined and showed for a packer with a diameter of 63.5 millimeters, the minimum exposed part of the ribs must be more than 413 millimeters. In the numerical simulation, the Z-folding and soft-set phenomena were observed and eliminated by changing the cover and belts pattern. The stress of welding sections was calculated and illustrated the stress of sliding end was less than the stress of fixed end. In deflation process, increasing the diameter of the internal tube was investigated. It’s showed that a part of this increase in diameter which is due to the viscoelasticity of the rubber is transient and was eliminated with the passage of time. But the simulations showed that another part of this increase of diameter is due to the permanent-set of rubber and was not eliminated over the time
  9. Keywords:
  10. Oil Wells ; Hyperelasticity ; Numerical Simulation ; Oil Well Completion ; Inflatable Packer

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