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Casing Design Optimization Considering Drilling and Production Conditions

Sadeghi, Mahdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54694 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed; Shad, Saeed
  7. Abstract:
  8. Casing design is one of the most expensive parts in the drilling of oil wells, and any cost reduction with the basic design of these casing strings will significantly reduce the total cost of the operation. In recent years, occurring scenarios-based casing design has become popular; Because in many cases, it eliminates non-occurring scenarios such as gas kick and saves on drilling costs. In this study, we have tried to investigate all scenarios that may occur during the lifetime of the well, whether drilling or production, and for each well, based on its own field information, possible scenarios for each casing part are selected separately and the applying loads are calculated. For this purpose, in the first, burst scenarios are investigated and the final burst design diagram is calculated. Each scenario can has its own internal pressure profile as well as its own external pressure profile. Similarly, the final collapse design diagram is calculated. Finally, using the characteristics of each part of casing string, axial stresses, the effect of biaxial stresses on burst and collapse and the triaxial design diagram is. In the following, according to the designed recursive algorithm, considering the design parameters and available casing grades, all selectable combinations of casing pipes are investigated then if they were suitable in terms of price, their resistance to all mentioned stresses would be checked and the optimum combination of casing parts in terms of cost and resistance to all stresses during the lifetime of the well will be determined for each casing string
  9. Keywords:
  10. Axial Stress ; Optimization ; Triaxial Stresses ; Impression Stress ; Casing Design ; Biaxial Stress ; Casing Failure

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