由于多分支水平井是复杂结构井，采用常规数值模拟方法和应用数学解析无法精准描述地下煤层气的渗流规律，为了更为直观地观察在复杂条件下煤层气的流动情况，基于多孔介质学理论，设计并搭建水电模拟试验平台，全面研究了分支数、分支长度、分支角度等井眼结构参数对煤层气压力分布规律、总产能和单位长度产能的影响，分析并验证多分支水平井之间是否存在支间干扰现象。结果表明：井眼结构参数对煤层气压力曲线的影响主要包括煤层气压力分布随着分支数量增加和分支长度的增加，在同等坐标点所对应的等压线数值不断变小，整体呈现出等压线变稀疏，即随着分支数的增加，煤层气压力曲线的形变幅度增大，抽采范围也随之增大；分支角度在30°、45°和60°情况下,对煤层气压力曲线的影响的形变幅度以45°支间角度最明显；煤层气压力曲线受分支的指端效应影响较大。对称多分支水平井分支井间存在支间干扰现象，控制支间干扰现象的关键是通过调整综合形态参数，合理控制分支数量、分支长度和分支角度关系，三者间的优化级为分支数＞分支长度＞分支角度；当试验参数为4分支数、200 mm分支长度、45°分支角度时，井眼结构参数可最大程度控制支间干扰现象，使煤层气生产效率和生产成本达到最佳状态。

Since multi-branch horizontal wells are wells with complex structures, the seepage law of underground fluids can’t be described accurately by conventional numerical simulation methods and mathematical analysis. In order to observe the flow of coal bed methane(CBM)  more intuitively under complex conditions, hydropower simulation experiment platform is designed and built on base of the theory of porous media to comprehensively study the influence of borehole structural parameters such as branch number, branch length, branch angle, etc. on the distribution of coal-bed pressure, total productivity and productivity per unit length, and analyze to verify whether there is branch interference between multi branch horizontal wells. The results show that the influence of borehole structure parameters on the pressure curve of CBM mainly includes that the value of isobars of pressure distribution of CBM decreases continuously with the increase of the number and length of branches  corresponding to the same coordinate points and isobars of pressure distribution become sparse on the whole, which means that the isobars of pressure distribution of CBM and the pumping range increase with the increase of the number of branches;When the branch angle is 30°, 45° and 60°, the deformation amplitude of 45° branch angle is the most obvious; The pressure curve of coalbed methane is greatly affected by the fingertip effect of branches. There is interference between symmetric multi-branch horizontal wells and its branches. The key to control the interference is to reasonably control the relationship of branch number, branch length and branch angle by adjusting the comprehensive shape parameters. The optimization level among the branch number, branch length and branch angle is branch number>branch length>branch angle; When the test parameters are 4 branches, 200 mm branch length and 45 ° branch angle, the borehole structure parameters can control the branch interference extremely, the production efficiency and production cost of CBM can reach the best state. 