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由于分支井之间干扰的存在，故相互间的夹角是影响多分支井产能的主要因素。文章以水电相似原理为基础，针对对称式多分支井、任意夹角的双分支井和鱼骨状井进行了一系列电模拟实验，利用相似系数将实验结果转换为相对应的多分支井的实际产能；评价了对称分支井的产能公式，重点研究了分支角度对分支井产能的影响，发现在分支长度都相等的情况下对称分支井在分支数超过4个（分支角度小于45°）后，产量增加幅度明显变缓；对于双分支井和四分支的鱼骨状井而言，也存在同样的规律。实验结果对优化分支井的结构和建立分支井的半解析产能模型提供了依据。

EXPERIMENT RESEARCH OF ELECTRIC ANALOGY FOR MULTI-BRANCH WELLS 1)

The angle between branches is the main factor to affect the productivity of multi-branch wells because there is interference between branches. Based on the principle of water and electricity similarity, a series of electric analogy experiments are conducted for the symmetric multi-branch wells, the dual branch wells with random included angle, and the fish-bone wells. With similarity coefficient, the experiment results are converted to the real productivity of the corresponding multi-branch wells. The productivity formula of the symmetric multi branch wells is evaluated. The influence of the included angle on the productivity of the branch well is mainly studied. It is found that the dimension of production increasing reduces obviously for the symmetric multi-branch wells when the branches exceed 4 (the included angle less than 45°) and the length of all branches is equal. As for dual branch wells and fish-bone wells with 4 branches, the same rule also exists. The experiment results provide the ground to optimize the structure of multi branch wells and establish the semi analysis productivity models of multi branch wells.