新型液压循环系统脉冲缓释装置CFD仿真分析

CFD Simulation Analysis of New Hydraulic Circulation System Pressure Pulse Sustained-Release Device

钻井泥浆泵采用往复式三缸泵,可提供较大的压力驱动泥浆循环,其流量和压力脉动如长时间不能有效抑制将导致外接管路破坏,储层受损坏,控压钻井难度增加等问题,影响动力钻具输出特性和稳定性,诱导动力钻具出现"粘-滑效应"。该文针对一种新型的缓释器,在分析其结构特点的基础上,对缓释器的弹性橡胶件共振系统、容积变化等部分分别进行了模型研究,推导数学模型,揭示了其结构原理。文章基于有限元分析软件ANSYS,建立泥浆脉冲缓释装置的CFD仿真模型,评价其缓释效果,为泥浆脉冲缓释装置的研究奠定了理论基础。该文为开展具有自适应负载的泥浆脉冲缓释装置的优化设计提供了参考依据,这种新型的泥浆缓释器能够用于改善实验室已有的孔底动力钻具实验台的测试条件,为后续开展涡轮钻具"粘滑振动"机理的研究奠定基础。

Drilling mud pump usually adopts reciprocating three-throw pump, which can provide greater pressure to drive the mud circulation.If it cannot effectively restrain the flow and the pressure pulsation, it will lead to external pipeline damage, reservoir damage and increase of the managed pressure drilling difficulties. It also influences mud motor＇s output property and stability,and induces ＂sticky-slip＂ effect appearing to the mud motor. Based on the analysis of its structure characteristics, this paper studies on a new kind of the mud pulse sustained-release devices, analyses the models of its elastic rubber resonance system and vessel volume change, derives the mathematical model in order to reveal its structure principle. Using the finite element analysis software ANSYS, the CFD simulation model of the mud pulse sustained-release device is established to evaluate the slow-release effect, which lays a theoretical foundation for research to slow-release devices. Thesis paper provides referential basis for the next step research of the optimization design to adaptive load mud pulse sustained-release devices. At the same time,the development of mud slow-release devices can be used for improving test conditions of the existing mud motors test bench, which lays the foundation for the subsequent turbo drill ＂stick-slip＂ vibration mechanism research.