油井封隔器内微型液压系统设计与仿真

Design and Simulation of Micro-hydraulic System in Oil Well Packer

封隔器是石油开采设备中重要的组成部分,其性能优异会直接影响到开采的进行。而传统封隔器采用机械式方式进行坐封,并依靠橡胶胶筒的自身回弹力进行解封。但在极端情况下,容易出现由于坐封力过大而造成封隔器胶筒发生压缩破坏,解封时胶筒损坏而无法回弹的情况。为此,设计了一种微型液压系统,可实现液压封隔器压紧力与解封力的协调控制及精确调节,保证封隔器实际工作中的安全可靠。搭建AMESim系统仿真模型,模拟运动过程中的坐封与解封过程,研究吸油处流道阻力、出口负载情况、柱塞泵的转速情况以及滑动缸内闭死容积等因素对液压系统动态特性的影响。最后对液压系统的参数进行优化。结果表明,采用微型液压系统入口增压、提升转速、减小吸油处流道阻力等措施可以提高整体系统的响应速率。

Packer is an important part of oil production equipment,and its excellent performance will directly affect the production.Conventional packers are mechanically set and unsealed by the self-resilience of the rubber cartridge.However,in extreme cases,it is easy to cause compression failure of packer rubber cylinder due to excessive setting force,and the rubber cylinder is damaged and unable to bounce back during unsealing.Therefore,a micro-hydraulic system is designed in this paper,which can realize the coordinated control and accurate adjustment of the pressing force and unpacking force of the hydraulic packer,so as to ensure the safety and reliability of the actual work of the packer.The AMESim system simulation model is built to simulate the seting and unsealing process in the process of motion,and the influence of factors such as the flow resistance at the oil suction,the load at the outlet,the speed of the piston pump and the closed volume in the sliding cylinder on the dynamic characteristics of the hydraulic system is studied.Finally,the parameters of the hydraulic system are optimized.The results show that the response rate of the whole system can be improved by adopting the measures of pressurizing the inlet of the micro-hydraulic system,increasing the rotational speed and reducing the flow resistance at the suction point.