包辛格效应在泵头体自增强上的应用  

Application of the Bauschinger Effect on Pump Head Autofrettage

作　　者：周思柱[1] 严奉林[1] 李宁[1] 刘春雪[1] 王勇[1] 陆英娜 

机构地区：[1]长江大学机械工程学院 [2]中石化石油工程机械有限公司第四机械厂

出　　处：《石油机械》2013年第7期62-66,共5页China Petroleum Machinery

基　　金：国家科技重大专项"泵头体自增强技术研究"(2011ZX05048-4)

摘　　要：针对油田压裂工艺中对压力的要求越来越高和压裂液的腐蚀性越来越大造成的压裂泵泵头体极易损坏的问题,根据自增强原理,研究了一套泵头体自增强压力计算方法。该方案基于材料的包辛格效应,根据反向屈服应力的大小找到最佳自增强压力,然后以某型号的压裂泵泵头体为研究对象,在ANSYS有限元软件中建立考虑材料应变硬化和包辛格效应的双线性随动强化理论模型,对自增强泵头体进行数值模拟计算。数值计算结果表明,在120 MPa工作压力下,与未经过自增强处理的泵头体相比,经过自增强处理的泵头体内部的整体应力分布均匀,最大应力较小,改善了泵头体内部的疲劳状况,延长了泵头体的使用寿命。该项研究成果可为工程应用提供理论依据。The required pressure is getting higher and the corrosion of fracture fluid is getting more serious in fracturing technology in oilfields. This leads to easy damage of fracture pump head. Therefore, a set of pressure calculation methods for pump head autofrettage was formulated according to the autofrettage principle. Based on the Bauschinger effect of material, the scheme seeks the optimal autofrettage pressure according to the amplitude of re- verse yield stress. Then, taking fracture pump head of some type as the object of study, the bilinear kinematic hardening theoretical model which considers material strain hardening and Bausehinger effect was established by the ANSYS software. The numeric simulation calculation of autofrettage pump head was conducted. The numeric calcula- tion shows that, comparison of pump heads with and without autofrettage treatment indicates that the overall stress distributes evenly within the pump head with autofrettage handling and the maximum stress is relatively small under an operating pressure of 120 MPa. This improves the fatigue condition within pump head and lengthens the service life of the head. The research findings can provide the theoretical basis for engineering application.

关 键 词：压裂泵 泵头体 包辛格效应 自增强 残余应力 有限元 

分 类 号：TE934[石油与天然气工程—石油机械设备]