Abstract: The convection-diffusion equation is solved by the finite difference method in which the common ion effect is taken into consideration and tfie leakage velocity V1 is supposed to be constant. The stability and conyergence of the difference schemes have been established. The authors have developed the computer programs, made the calculations and drawn up charts for making out the effective acid penetration along the fractures as Shown in Figs. 3-6. The economic indices and errors of the charts are evaluated and the method of their application is described. The charts may also serve as useful tools for studying the mechanism and designing of fracturing and acidization in oil and gas wells.

摘要： 在进行油气井酸化施工设计时,由于技术上的原因,均未考虑同离子效应对酸液有效作用距离(L_有效)的影响。我们的计算证明忽略同离子效应的影响会给L_有效的计算带来很大的误差。本文在考虑同离子效应的条件下,当V₁=常数时;用差分法求解对流扩散方程,编制了计算软件及L_有效计算图版。论证了图版的精度,介绍了图版的使用方法。并与不考虑同离子效应的L_有效计算图版进行对比,阐明了酸化压裂中考虑同离子效应的必要性。