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After high-intensity and long-period water injection in offshore unconsolidated sandstone oilfields, it is easy to develop advantageous seepage channels with strong connectivity between injecting and producing wells, resulting in inefficient circulation of injecting fluid, which exerts a serious influence on oil production. Based on the interwell connectivity model, by utilizing the geological data and production data of oilfields and taking into account the proportion of differences in permeability in well connecting units, coupled with automatic history matching algorithm, a new indicator called permeability non-uniformity coefficient is proposed and established, which can be used to quantitatively characterize the difference in connectivity strength in target area, and the corresponding classification criteria is also established based on the mechanism model results analysis. And the new method has been applied in Soilfield. The result shows that with the increase of permeability non-uniform coefficient, the cumulative oil production continues to decrease, the anhydrous oil recovery period continues to shorten, and the uneven of injection profiles intensifies; as the permeability non-uniform coefficient is greater than 3, the dividing factor from injector to single producer can reach 70%, and the anhydrous oil recovery period of the producer can be reduced by 75%; actual block application shows that the relative difference of permeability between the interwell connectivity model calculated and the tracer test interpretation is 4.5%, which is consistent with the dynamics data and testing results, indicating the method can be suitable for oilfield scale applications, and well pair P07-P01, P07-P02, P16-P10 and P09-P08 are selected as the targets for the subsequent plugging measures. The new method comprehensively consider the static and dynamic data of the oilfield. Compared with traditional reservoir engineering method and numerical simulation method, the computational efficiency is improved by dozens of times. Besides, the permeability modified by history matching can better reflect interwell connectivity after long period of water flooding development, and can provide effective basis for identifying advantageous seepage channels and making adjusting plans.

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A New Method for Identifying and Characterizing Interwell Advantageous Seepage Channels in Offshore Oilfields

  • 会议论文

  • 发表日期：

    2025年

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  • Yu-yang Liu,
  • Zhi-jie Wei,
  • Yong-jun Chen,
  • Jian Zhang,
  • Wei Yong

摘要

After high-intensity and long-period water injection in offshore unconsolidated sandstone oilfields, it is easy to develop advantageous seepage channels with strong connectivity between injecting and producing wells, resulting in inefficient circulation of injecting fluid, which exerts a serious influence on oil production. Based on the interwell connectivity model, by utilizing the geological data and production data of oilfields and taking into account the proportion of differences in permeability in well connecting units, coupled with automatic history matching algorithm, a new indicator called permeability non-uniformity coefficient is proposed and established, which can be used to quantitatively characterize the difference in connectivity strength in target area, and the corresponding classification criteria is also established based on the mechanism model results analysis. And the new method has been applied in Soilfield. The result shows that with the increase of permeability non-uniform coefficient, the cumulative oil production continues to decrease, the anhydrous oil recovery period continues to shorten, and the uneven of injection profiles intensifies; as the permeability non-uniform coefficient is greater than 3, the dividing factor from injector to single producer can reach 70%, and the anhydrous oil recovery period of the producer can be reduced by 75%; actual block application shows that the relative difference of permeability between the interwell connectivity model calculated and the tracer test interpretation is 4.5%, which is consistent with the dynamics data and testing results, indicating the method can be suitable for oilfield scale applications, and well pair P07-P01, P07-P02, P16-P10 and P09-P08 are selected as the targets for the subsequent plugging measures. The new method comprehensively consider the static and dynamic data of the oilfield. Compared with traditional reservoir engineering method and numerical simulation method, the computational efficiency is improved by dozens of times. Besides, the permeability modified by history matching can better reflect interwell connectivity after long period of water flooding development, and can provide effective basis for identifying advantageous seepage channels and making adjusting plans.