The water flooding characteristic curve method is one of the essential techniques to predict recoverable reserves. However, the recoverable reserves indicated by the existing water flooding characteristic curves of low-amplitude reservoirs with strong bottom water increase gradually, and the current local recovery degree of some areas has exceeded the predicted recovery rate. The applicability of the existing water flooding characteristic curves in low-amplitude reservoirs with strong bottom water is lacking, which affects the accurate prediction of development performance. By analyzing the derivation process of the conventional water flooding characteristic curve method, this manuscript finds out the reasons for the poor applicability of the existing water flooding characteristic curve in low-amplitude reservoir with strong bottom water and corrects the existing water flooding characteristic curve according to the actual situation of the oilfield and obtains the improvement method of water flooding characteristic curve in low-amplitude reservoir with strong bottom water. After correction, the correlation coefficient between \(\frac{{k_{ro} }}{{k_{rw} }}\) and \(S_{w}\) is 95.92%. According to the comparison between the actual data and the calculated data, in 2021/3, the actual water cut is 97.29%, the water cut predicted by the formula is 97.27%, the actual cumulative oil production is 31.19 × 10⁴t, and the predicted cumulative oil production is 31.31 × 10⁴t. The predicted value is consistent with the actual value. It provides a more reliable method for predicting low-amplitude reservoirs' recoverable ability with strong bottom water and guides the oilfield's subsequent decision-making.

水驱特征曲线法是预测可采储量的重要技术之一。但现有的低幅强底水油藏注水特征曲线显示的可采储量逐渐增加，目前部分地区局部采收程度已超过预测采收率。现有水驱特征曲线对强底水低振幅油藏的适用性不足，影响开发动态的准确预测。通过分析常规注水特征曲线法的推导过程，本稿找出现有水驱特征曲线在强底水低振幅油藏适用性差的原因，并根据油田实际情况对现有水驱特征曲线进行修正，得出水驱改进方法强底水低振幅油藏特征曲线。修正后的相关系数\(\frac{{k_{ro} }}{{k_{rw} }}\)和\(S_{w}\)是 95.92%。根据实际数据与计算数据对比，2021/3年实际含水率为97.29%，公式预测含水率为97.27%，实际累计产油量为31.19×10 ⁴ t，预测的累计石油产量为 31.31 × 10 ⁴ t。预测值与实际值一致。为预测低振幅油藏强底水可采能力提供了更可靠的方法，指导油田的后续决策。