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Study and Optimization of Gas-Polymer Alternating Injection Technique for Offshore Oil Field After Polymer Flooding

  • Xuejiao Zhang
  • Shijun Huang
  • Guanyang Ding
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Suizhong 36-1 oil field is located in Liaodong Bay of Bohai Sea. In the paper, residual oil content and distribution of target area is displayed and the ultimate goal is to study gas-polymer alternating injection and work out an appropriate injection scheme for it. First, gas-polymer alternating injection mechanism is demonstrated. Second, A and B platform’s fault upper area of phase I is selected as the target block to adopt gas-polymer alternating injection experiment. Third, the geological modeling for SZ36-1 oil field is established to describe sandstone distributing regularities in vertical and horizontal directions and further make it clear how residual oil distributes. Then, by the means of numerical simulation, history match is conducted. At last, through orthogonal design, the optimum injection program is determined successfully. With the help of orthogonal design, applying range analysis and variance analysis procedure, the optimum parameters of gas-polymer alternating injection are obtained from 16 forecast scenarios. They are as follows: the gas injection volume is 0.3 PV, the injection rate is 0.03 PV/a, the gas–liquid ratio is 1:2, and alternating injection cycle is 30 days. Furthermore, compared with polymer flooding, the oil recovery gas-polymer alternating injection increases by about 5%.

Keywords

Residual oil Gas-polymer alternating injection Numerical simulation Optimum scheme analysis 

Notes

Acknowledgements

This work has been supported by many people. The authors acknowledge them who contributed to the research and the paper.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.China University of PetroleumBeijingChina

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