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The main blocks of the peripheral oilfields of Changyuan Oilfield have entered the stage of high water cut. The difficulty of treating conventional water drive development is relatively high. The deep profile control and flooding technology based on weak gel is one of the effective development technologies for water control, oil stabilization and enhanced oil recovery in the peripheral oilfields of Changyuan Oilfield at present. The continuous injection of profile control and flooding system is the fundamental to ensure the effect of profile control and flooding. To ensure the effectiveness of injection and personalized adjustment of single well injection concentration in the experimental area, research on the evaluation method of injection concentration in the injection and control system is carried out. Regard the weak gel system as a power-law fluid, the pressure calculation formula of power-law fluid flowing in porous media is established. The diagram of the relationship between injection pressure and injection concentration is established. Based on mathematical statistics, the regression equation for the allowable injection pressure difference of single well profile control and flooding is established, comprehensively determine the maximum injection concentration limit of a single well. The evaluation method for injection concentration of formation control flooding system is established. Taking the B Experimental Area as example, this evaluation method to determine the maximum injection concentration of 14 injection wells for profile control and flooding is applied. The difference between the calculated result and the actual injection concentration is small. The method is proved to guide the injection of the profile control and flooding system effectively. Meanwhile the recovery rate and water content changes are basically consistent with the predicted values. The feasibility of this evaluation method is proved. The method can be used in the design and personalized adjustment of injection parameters in similar experimental areas.

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Research on Evaluation Method of Injection Concentration of Weak Gel Profile Control and Flooding System

  • 会议论文

  • 发表日期：

    2025年

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  • Hong-jian Liu

摘要

The main blocks of the peripheral oilfields of Changyuan Oilfield have entered the stage of high water cut. The difficulty of treating conventional water drive development is relatively high. The deep profile control and flooding technology based on weak gel is one of the effective development technologies for water control, oil stabilization and enhanced oil recovery in the peripheral oilfields of Changyuan Oilfield at present. The continuous injection of profile control and flooding system is the fundamental to ensure the effect of profile control and flooding. To ensure the effectiveness of injection and personalized adjustment of single well injection concentration in the experimental area, research on the evaluation method of injection concentration in the injection and control system is carried out. Regard the weak gel system as a power-law fluid, the pressure calculation formula of power-law fluid flowing in porous media is established. The diagram of the relationship between injection pressure and injection concentration is established. Based on mathematical statistics, the regression equation for the allowable injection pressure difference of single well profile control and flooding is established, comprehensively determine the maximum injection concentration limit of a single well. The evaluation method for injection concentration of formation control flooding system is established. Taking the B Experimental Area as example, this evaluation method to determine the maximum injection concentration of 14 injection wells for profile control and flooding is applied. The difference between the calculated result and the actual injection concentration is small. The method is proved to guide the injection of the profile control and flooding system effectively. Meanwhile the recovery rate and water content changes are basically consistent with the predicted values. The feasibility of this evaluation method is proved. The method can be used in the design and personalized adjustment of injection parameters in similar experimental areas.