在利用水平井开发油气过程中，井筒附近往往存在渗透率较低的污染带，而通过酸化能够增大该污染带的渗透率，但此时油气井的产能将发生较大变化，因此准确预测酸化后的水平井产能十分重要。 以水平井渗流原理为基础，将水平井的三维渗流简化为 2 个二维平面渗流，利用面积等值原则、保角变换方法、复势理论以及等值渗流阻力法推导出了水平井酸化后的产能计算公式。 通过实例分析和对比，发现利用本文公式和其他常规水平井产能公式计算出的产量均比实际产量低，但本文公式的计算结果与实际产量的相对误差最小，对水平井酸化后的产能预测具有一定的实用性，可为水平井酸化后的产能预测及动态分析提供新的研究思路。

During the developing of oil and gas field with horizontal wells, there always exists a damage zone with low or ultra-low permeability near the wellbore. Through acidizing, the permeability near the wellbore will become higher than ever before, eventually the well can get high productivity, so it is of great importance to accurately predict the productivity of horizontal wells after acidizing. Based on the seepage principle, this paper simplified the three dimensional seepage mode of horizontal wells into two two-dimensional seepage, and applied the area equivalence principle, conformal mapping method, complex potential theory and the law of equivalence percolation resistance to deduct a new productivity formula of horizontal wells after acidizing. Through case study and correlation, the results calculated by the new formula and classic productivity formula of horizontal wells are smaller than practical output, but the relative error from the results calculated by new formula is the smallest. So, the new formula is more practical for predicting the productivity of horizontal wells after acidizing. The study can provide new research method for the productivity prediction and dynamic analysis of horizontal wells after acidizing.