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Well Testing Analysis during Acidizing Operation

Shabani, Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50350 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed; Jahangiri, Hamid Reza
  7. Abstract:
  8. The efficiency of acidizing operation is usually assessed through Build up or Drawdown test (calculation of skin). These methods are performed only after the acidizing operation, so it is impossible to evaluate the efficiency of acidizing during the real time operation. Analysis of the acidizing efficiency during the operation by using the acidizing operation data is a viable approach to this costly and challenging process. In this project, it has been tried to present a well testing method for calculating changes of skin value of a carbonate reservoirs during acidizing operation by using the real field data (surface pressure, injection rate and etc.).
    The estimation of skin changes during acidizing operation needs an appropriate mathematical model that can handle the main aspects of a real acidizing operation including, the acid reaction rate and the fluid velocity. In the reality, it is tedious to model a real acidizing operation due to the heterogeneity of reservoir, an unknown reaction rate of acid in reservoir condition, unwanted fluid loss, opening and closing of the wing valve by operator and etc. So, in this project a simplified reservoir acidizing model has been proposed. The method is based on continuity equations of acid in the reservoir coupled with analytical equations of a mathematical approach in the wellbore. The novelty of our model are application of a simplified acid reaction rate, using a mathematical approach for the appropriate estimation of bottomhole acid injection rate and fluid loss that lead to the appropriate estimation of skin variation during a real field acidizing operation
  9. Keywords:
  10. Reaction Rate ; Injection Rate

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