珲春盆地是我国低煤阶煤层气勘探开发的又一重要领域。基于该区块重点井的排采数据及开发过程中遇到的问题,探讨了多煤层合采过程中煤层出露的伤害机理,初步形成了最大化煤层气产气效果的措施。结果表明,煤层气在压裂排采过程中,会受到多种因素的影响,包括自身孔隙结构特征,敏感性矿物和贾敏效应。这些都会导致压降漏斗形成不够充分,使得煤层气井难以达到预期效果的因素。煤储层出露会在井筒附近形成低渗流带,导致地层水和压裂液无法排除,煤层气解析过程终止,对煤层造成不可修复的伤害。科学的排采制度是煤层气成功的关键,严格控制上部储层出露时间,最大化压降漏斗范围,保证套管压力的平稳,发挥多煤层合采优势。 Hunchun basin is another important area of ​​exploration and development of low rank CBM in our country. Based on the mining data of key wells in the block and the problems encountered in the process of development, the damage mechanism of coal seam outburst during multi-coal seam mining was discussed, and measures to maximize the gas production effect of CBM were initially formed. The results show that CBM can be affected by many factors during the fracturing process, including its own pore structure, sensitive minerals and Jia-Min effect. All of these will lead to insufficient formation of pressure drop funnel, making coalbed methane difficult to achieve the desired effect. The formation of coal reservoirs will cause the formation of low-permeability zones near the wellbore, resulting in the inability of formation water and fracturing fluid to be eliminated. The process of coal-bed gas analysis will be terminated and the coal seam will be irreparably damaged. Scientific mining system is the key to the success of CBM. Strict control of the upper reservoir exposure time, maximum pressure drop funnel range, to ensure that the casing pressure is stable, play multi-coal mining advantages.