基于nCode的压裂泵液力端疲劳寿命分析  

Fatigue Life Analysis on Hydraulic End of Fracturing Pump Based on nCode DesignLife

作　　者：刘先明 杭峥 王波 李枝林 李雷 黄崇君 管锋[1] Liu Xianming;Hang Zheng;Wang Bo;Li Zhilin;Li Lei;Huang Chongjun;Guan Feng(School of Mechanical Engineering,Yangtze University;Shale Gas Division,Sichuan Honghua Electric Co.Ltd.;Research Institute of Drilling and Producing Engineering Technology,CNPC Chuanqing Drilling Engineering Company Limited)

机构地区：[1]长江大学机械工程学院 [2]四川宏华电气有限责任公司页岩气事业部 [3]中国石油川庆钻探公司钻采工程技术研究院

出　　处：《石油机械》2023年第4期90-96,共7页China Petroleum Machinery

基　　金：油气藏地质及开发工程国家重点实验室开放基金资助项目“基于钻井早期溢流监测的自动化关井技术研究”(PLN2020-12);湖北省教育厅科学研究计划资助项目“不同钻井工况下溢流识别算法及自动化关井机理研究”(D20201305)。

摘　　要：压裂泵液力端在现场应用中承受脉动循环高压,易产生疲劳裂纹且不同液缸的疲劳寿命存在差异。为此,建立现场某型号压裂泵液力端的整体有限元模型,利用ANSYS与nCode DesignLife疲劳耐久性分析软件对液力端进行静力学分析与疲劳寿命预测,研究液力端不同液缸发生疲劳破坏的规律。研究结果表明:液力端在试压142.5 MPa与正常工作95 MPa这2种状态下,最大应力分别为915.89和600.36 MPa,均小于其材料的屈服应力1 070 MPa,静力学强度满足要求;液力端各个液缸易发生疲劳破坏的位置均位于液缸内部的弹簧卡座处,与液力端在现场使用过程中出现的疲劳裂纹的位置相符;液力端5个液缸中寿命最长的为4#缸,寿命最短的为1#缸,1#缸的疲劳寿命大约为4#缸的60%,液力端整体呈现出1#、5#缸比2#、3#、4#缸疲劳寿命短的规律。研究结果可为该型号压裂泵液力端的优化设计提供理论依据。The hydraulic end of fracturing pump is subjected to pulsating circulating high pressure in field application, fatigue crack easily occurs, and the fatigue life of different hydraulic cylinders is different.An overall finite element model of hydraulic end of a field fracturing pump was built.Then, the ANSYS and nCode DesignLife-fatigue endurance analysis software was used to conduct static analysis and fatigue life prediction on the hydraulic end, and study the fatigue failure laws of different hydraulic cylinders at the hydraulic end.The study results show that the maximum stress of the hydraulic end at 142.5 MPa test pressure and 95 MPa normal working pressure is 915.89 MPa and 600.36 MPa respectively, all less than the yield stress of 1 070 MPa of the material, so the static strength meets the requirements.The positions where the hydraulic cylinders at hydraulic end easily suffer from fatigue failure are all located at the spring seats inside the hydraulic cylinders, which is consistent with the position where fatigue crack occurs at hydraulic end in field application.Among the five hydraulic cylinders at the hydraulic end, cylinder 4# has the longest life, while cylinder 1# has the shortest life, the fatigue life of cylinder 1# is about 60% that of cylinder 4#, and the hydraulic end generally has a law that the fatigue life of cylinders 1# and 5# is shorter than that of cylinders 2#, 3# and 4#.The study results provide a theoretical basis for the optimal design of hydraulic end of this type of fracturing pump.

关 键 词：压裂泵液力端 液缸 静力学分析 nCode DesignLife 疲劳寿命预测 

分 类 号：TE934[石油与天然气工程—石油机械设备]