深部煤矿保压取心触发装置仿真优化及应用

Simulation optimization and applications of pressure-preserved triggering device for coring in deep coal mines

保压控制器是深部煤矿保压保瓦斯取心装备的核心部件,其保压能力与密封性能是保压保瓦斯取心技术的关键。针对保压控制器仅由重力提供初始密封力时,初始密封比压较小、密封性能差的问题,设计了一种保压取心触发装置,以期为保压控制器实现密封提供初始密封比压。采用动力有限元对该触发装置工作过程进行数值仿真,并根据仿真结果对保压取心触发装置进行优化,之后对优化后的保压取心触发装置进行室内实验。结果表明:优化后的保压取心触发装置可为保压控制器实现密封提供足够的初始密封比压,且不影响保压控制器的保压能力,可满足井下瓦斯压力的维持。同时,为了检验保压取心触发装置在整套装备中的应用效果,开展了保压保瓦斯取心现场试验,试验测试过程中保压取心触发装置运行平稳,并成功取得保压煤心样品,验证了保压取心触发装置功能的可靠性。

The pressure-preserved controller is the core component of pressure-and gas-preserved coring equipment used in deep coal mines.Its pressure-preserved capability and sealing performance are the key to pressure-and gas-preserved coring technology.Given that the existing pressure-preserved controller exhibits low initial sealing specific pressure and poor sealing performance when its initial sealing force is provided only by gravity,this study innovatively designed a pressure-preserved triggering device for coring,aiming to provide initial sealing specific pressure required for the sealing of the pressure-preserved controller.Then,this study conducted numerical simulations of the operating process of the triggering device using the dynamic finite element method.Based on the simulation results,this study optimized the pressure-preserved triggering device,for which laboratory tests were conducted.The results show that the optimized pressure-preserved triggering device can provide sufficient initial sealing specific pressure required for the sealing of the pressure-preserved controller without affecting the pressure-preserved capacity of the controller,thus maintaining the downhole gas pressure.Furthermore,to verify the application performance of the pressure-preserved triggering device in the whole set of pressure-and gas-preserved coring equipment,this study performed an industrial test of pressure-and gas-preserved coring.During the industrial test,the optimized pressure-preserved triggering device operated smoothly,and pressure-preserved coal core samples were successfully obtained.These results verify that the optimized pressure-preserved controller is reliable.