具有原位测量功能的井壁取心器液压系统设计及分析

Design and Analysis of Hydraulic System of Sidewall Coring Tool with In-Situ Measurement Function

为实现新型带原位测量功能的取心器井下取心及原位测量的任务,设计了取心器液压控制系统。该系统设计了新型的切换模块液压回路,增加安全阀、双向节流阀、叠加式溢流阀,使切换液压缸入口压力平稳,避免了振荡现象。对钻进控制阀的静、动态特性进行了分析,并基于AMESim建立液压系统的仿真模型。仿真结果表明:钻进液压缸在0~10 s移动0.028 m,23~50 s移动0.15 m,切换回路液压缸输入压力稳定在1.68 MPa,流量9.50 L/min,无压力波动,活塞杆移动平稳。因此,验证了液压系统设计的合理性和可靠性。

The new type of sidewall coring tool with in-situ measurement function can realize the task of both coring and measuring the parameters of coring in real time.The hydraulic control system is designed for the sidewall coring tool.A new type of hydraulic switching loop is designed for the hydraulic control system.The inlet pressure of the switching hydraulic cylinder is stabilized and the pressure oscillation can be avoided by adding a safety valve,a two-way throttle valve and a superimposed overflow valve.The static and dynamic characteristics of the drilling control valve were analyzed.The simulation model of the hydraulic control system is established based on AMESim.Simulation result shows that the drilling hydraulic cylinder moves 0.028 m in 0~10 s and 0.15 m in 23~50 s.The input pressure of the hydraulic cylinder of the switching circuit is stable at 1.68 MPa,and the flow rate is 9.50 L/min.There is no pressure fluctuation and the piston rod moves smoothly.Those verify the rationality and reliability of the designed hydraulic system.