Abstract There are obvious differences in the reservoir-forming mechanisms, flow mechanisms, and production trends between a multilayer superposed CBM system and a single CBM system. This paper performed large-scale physical simulations of CBM production in a multilayer superposed gas-bearing system. According to the experimental results, during commingled production, gas backfilling from a high initial reservoir pressure coal seam into a low reservoir pressure coal seam (LRPCM) occurred, which restrained or even shielded gas production from the low initial reservoir pressure coal seam. Progressive production effectively prevented gas backfilling by optimizing the gas production time of the coal seam, giving the coal seam a more reasonable productivity distribution. The permeability of the two production schedules showed obvious differences in the early stage, which gradually decreased in the middle and late stages. Different values of the coefficient D showed that progressive production provided a better production schedule.

中文翻译：

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多层叠加煤层气系统生产进度优化：实验研究

摘要 多层叠置煤层气系统与单一煤层气系统在成藏机制、流动机制和生产趋势等方面存在明显差异。本文对多层叠加含气系统中的煤层气生产进行了大规模物理模拟。根据实验结果，在混采过程中，发生了从高初始储层压力煤层向低储层压力煤层（LRPCM）的气体回填，抑制甚至保护了低初始储层压力煤层的产气。渐进式生产通过优化煤层产气时间，有效防止瓦斯回填，使煤层产能分布更加合理。两个生产计划的渗透率在前期表现出明显的差异，在中后期逐渐降低。系数 D 的不同值表明渐进式生产提供了更好的生产计划。