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<p>Most reservoirs still use traditional formation division methods, failing to dynamically subdivide oil layers based on detailed geological studies. This results in low utilization rates of high-quality reservoirs and wastage of injection and production resources in inefficient layers. Addressing this issue, this research analyzes the theory of well pattern adjustment optimization for ultra-high water cut reservoirs and introduces a collaborative optimization method for tomographic subdivision and well pattern adjustment. On this basis, using a specific oilfield as an example, case application and effect analysis are carried out to lay the foundation for improving the development efficiency and effectiveness of ultra-high water cut reservoirs in China. Research shows: Formation subdivision based on fluid unit concepts can significantly improve reservoir utilization. The constructed multi-objective optimization mathematical model effectively describes the coupling relationship between formation systems and well patterns. After applying the collaborative optimization measures of well pattern adjustment and formation subdivision in a specific oilfield, the formation utilization rate increased to 91%, and the expected ultimate recovery rate improved by 7.2%, with a collaborative synergy contribution rate of 28.3%, confirming the systematic advantages of collaborative optimization. The conclusion suggests that this method can provide technical support for domestic ultrahigh water cut oilfields to improve recovery rates and extend stable production periods.</p>

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Research on Collaborative Optimization Method of Well Pattern Adjustment and Formation System Subdivision in Ultra-High Water Cut Reservoirs

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Yuanyuan Wu,
  • Hong Guo,
  • Nan Zhang,
  • Jinlong Liu,
  • Yongzheng Zhang,
  • Zhiwei Jiang

摘要

Most reservoirs still use traditional formation division methods, failing to dynamically subdivide oil layers based on detailed geological studies. This results in low utilization rates of high-quality reservoirs and wastage of injection and production resources in inefficient layers. Addressing this issue, this research analyzes the theory of well pattern adjustment optimization for ultra-high water cut reservoirs and introduces a collaborative optimization method for tomographic subdivision and well pattern adjustment. On this basis, using a specific oilfield as an example, case application and effect analysis are carried out to lay the foundation for improving the development efficiency and effectiveness of ultra-high water cut reservoirs in China. Research shows: Formation subdivision based on fluid unit concepts can significantly improve reservoir utilization. The constructed multi-objective optimization mathematical model effectively describes the coupling relationship between formation systems and well patterns. After applying the collaborative optimization measures of well pattern adjustment and formation subdivision in a specific oilfield, the formation utilization rate increased to 91%, and the expected ultimate recovery rate improved by 7.2%, with a collaborative synergy contribution rate of 28.3%, confirming the systematic advantages of collaborative optimization. The conclusion suggests that this method can provide technical support for domestic ultrahigh water cut oilfields to improve recovery rates and extend stable production periods.