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Experimental Investigation and Comparison of Water Alternative Gas (WAG) and Continuous Gas Injection (CGI) Processes in One of Iranian Oil Reservoirs

Souri Laki, Ali | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41006 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Sirous; Kharrat, Reyaz
  7. Abstract:
  8. Gas injection processes are considered as the second largest Enhanced Oil Recovery processes after thermal processes. In Dealing with the problems of Continuous Gas Injection (CGI) processes, the substitute method of Water Alternating Gas (WAG) is gaining ever increasing attention in field applications. The Hybrid method has the advantages both CGI and WAG processes. Laboratory studies of gas injection methods to show the optimum method and the effect of pressure on the performance of this method is the main objective of this project. Results obtained from these tests can be used in the Enhanced Oil Recovery scenarios for this reservoir. In this project, experiments for Continuous Gas Injection Processes at four different pressures for Dead Oil and at two different pressures for Live Oil were conducted. For the Water Alternating Gas processes, Dead Oil experiments at two different pressures and a Live Oil experiment at 1650 psi were performed. To investigate the Hybrid method, an experiment at 1600 psi was carried out. Enhanced Oil Recovery charts for different pressures, different methods of injection, different Pressure Gradients and water and oil production values are available for laboratory results. In addition, using the water and oil injection results, wettability charts are produced. Also, the characteristics of the artificial oil are compared with those of the reservoir oil. Using the results for the studied reservoir, it can be deduced that the use of WAG injection method produces more favorable results than CGI injection method. The highest recovery from the WAG method was obtained at 1600 psi for the dead oil sample. Using the dimensionless number of Tertiary Recovery Factor, it can be understood that the Hybrid method of injection, which is a combination of WAG and CGI methods produces better results than any of these two methods alone. The use of Hybrid method at 1600 psi increased oil recovery by 6%. Using the results of this project, the point that the Hybrid method of injection can be a good alternative for the WAG and CGI methods can be reached.
  9. Keywords:
  10. Water Alternative Gas (WAG)Injection ; Gas Injection ; Hybrid Methods ; Tertiary Recovery ; Experimental Investigation ; Enhanced Oil Recovery ; Continuous Gas Injection

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