Aiming at the “multilayer superimposed coalbed methane (MSCBM) system,” which is a widely developed CBM reservoir formation mode, a MSCBM production test device was developed. The initial reservoir pressure of the simulated reservoirs (coal seams Nos. I–IV) was 1.0, 1.4, 1.8, and 2.2 MPa, respectively. MSCBM production experiments were carried out using different numbers of gas-producing layers. The pressure difference coefficient D is used to quantitatively analyze the influence of the number of gas producing layers on the reservoir pressure. The D value significantly changes in the initial stage of production but not in the middle and late stages. With an increase in the number of gas-producing layers from one to two and to four, the D value gradually increases, indicating that the pressure interference between the reservoirs dynamically changes and gradually enhances. With the increase in the number of gas-producing layers, the cumulative production flow in coal seams with low reservoir pressure decreases based on a power function, and the production time increases based on the natural logarithm. With an increasing number of gas-producing layers, the cumulative production flow of the superimposed coal seam linearly increases and the production time decreases based on a power function. The test results provide reference data for numerical simulations and guidance for engineering sites with respect to balancing economic benefits and time cost.

针对广泛开发的煤层气成藏模式“多层叠加煤层气（MSCBM）系统”，开发了MSCBM生产测试装置。模拟储层（I–IV煤层）的初始储层压力分别为1.0、1.4、1.8和2.2 MPa。使用不同数量的产气层进行了MSCBM生产实验。压差系数D用于定量分析产气层数对储层压力的影响。该d值显著改变生产的初始阶段，但不是在中后期阶段。随着产气层数从一增加到两，再到四，D值逐渐增加，表明储层之间的压力干扰动态变化并逐渐增强。随着产气层数的增加，储层压力低的煤层中的累计生产流量根据幂函数而减小，而生产时间根据自然对数而增加。随着产气层数的增加，基于幂函数，叠加煤层的累积生产流量线性增加，生产时间减少。测试结果可为数值模拟提供参考数据，并为平衡经济利益和时间成本提供指导。