原位煤层气排采储层伤害机理与制度优化

摘要

原位煤层气排采过程中,人为控制的排液与产气速度影响到煤储层渗透率的变化。排采作业制度不合理,易造成煤岩破坏、煤粉堵塞等储层伤害现象,并影响到煤层气井产能。基于地下水动力学制定合理的排液速度,合理控制井底压差,及时处理排采设备故障等措施可显著降低排采所造成的储层伤害,实现原位煤层气井的高产稳产。%In the process of in-situ coalbed methane drainage and production, human back and the rate of gas production affect the change of coal reservoir permeability. The eration cludes system of drainage damage controlled flowing unreasonable op- and production maybe cause the phenomenon of reservoir damage, which of coal petrography and jam of combed ash, and impact on the combed methane produc- tion. Based on the condition of underground pressure difference is controlled reasonably. tion timely can reduce reservoir that in-situ coalbed methane is water, the rate of flowing back is confirmed. Bottom hole Dealing damage observably produced efficiently with the equipment failure of drainage and produc- in the process of drainage and production and realize and stably.