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After long-term development, the oilfield which were injected polymer in early stage in the Bohai Sea has gradually entered the double-high development stage of high water cut and high recovery degree. It is of great significance to clarify the physical property change characteristics and development rules of the oilfield in different displacement stages to guide the oilfield to maintain stable production in the double-high development stage. Based on the core displacement experiment, by characterizing the physical property change law of the core in the polymer flooding stage and water flooding stage under different initial physical property conditions, a time-varying mathematical model of physical property grading in the whole stage considering the damage characteristics of polymer flooding physical property and the increase characteristics of water flooding physical property is established. Using numerical simulation software, the quantitative and continuous characterization of reservoir physical properties changing with time in different stages of early polymer injection oilfield is realized. Aiming at the problem that the complex law of water absorption is difficult to guide effective water injection, by describing the dynamic change law of water injection profile on physical properties and pressure difference, the main control factors affecting the change of water injection profile are clarified, and the optimal water injection method of early polymer injection oilfield in double high stage is established. The research shows that the full-stage physical property classification time-varying numerical simulation can accurately describe the variation characteristics of water absorption profile and realize the balanced utilization of multi-layer reservoir reserves on the basis of significantly improving the fitting accuracy of water cut. Compared with the traditional KH injection allocation method, the established injection-production optimization method is used to carry out 5 well-times layered allocation in the early polymer injection oilfield. The water content of the surrounding 9 production wells is reduced by 6%, and the daily oil increase reaches 169 square, which has a significant effect of precipitation and oil increase.

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Study on the Change Law of Physical Properties and Optimized Water Injection in Early Polymer Injection Oilfield in Bohai Sea

  • 会议论文

  • 发表日期：

    2025年

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  • Zi-you Yang,
  • Li-zhen Ge,
  • Jing Zhang,
  • Xiao-ming Chen,
  • Bin Zheng

摘要

After long-term development, the oilfield which were injected polymer in early stage in the Bohai Sea has gradually entered the double-high development stage of high water cut and high recovery degree. It is of great significance to clarify the physical property change characteristics and development rules of the oilfield in different displacement stages to guide the oilfield to maintain stable production in the double-high development stage. Based on the core displacement experiment, by characterizing the physical property change law of the core in the polymer flooding stage and water flooding stage under different initial physical property conditions, a time-varying mathematical model of physical property grading in the whole stage considering the damage characteristics of polymer flooding physical property and the increase characteristics of water flooding physical property is established. Using numerical simulation software, the quantitative and continuous characterization of reservoir physical properties changing with time in different stages of early polymer injection oilfield is realized. Aiming at the problem that the complex law of water absorption is difficult to guide effective water injection, by describing the dynamic change law of water injection profile on physical properties and pressure difference, the main control factors affecting the change of water injection profile are clarified, and the optimal water injection method of early polymer injection oilfield in double high stage is established. The research shows that the full-stage physical property classification time-varying numerical simulation can accurately describe the variation characteristics of water absorption profile and realize the balanced utilization of multi-layer reservoir reserves on the basis of significantly improving the fitting accuracy of water cut. Compared with the traditional KH injection allocation method, the established injection-production optimization method is used to carry out 5 well-times layered allocation in the early polymer injection oilfield. The water content of the surrounding 9 production wells is reduced by 6%, and the daily oil increase reaches 169 square, which has a significant effect of precipitation and oil increase.