摘要
针对钻井过程中钻具疲劳断裂问题,采用旋转弯曲疲劳试验研究了S135和165ksi 2种高强度钻杆钢的疲劳性能。基于Basquin模型得出2种高强度钻杆钢中长寿命区的疲劳极限分布。研究结果表明,取95%的置信水平,则50%、90%和99%可靠度下的165ksi钻杆钢的疲劳极限分别为662.54、645.92和632.28 MPa,S135钻杆钢的疲劳极限分别为595.83、541.87和529.73MPa,并得出了2种高强度钻杆钢完整的应力-疲劳寿命S-N曲线。试验结果可以为深井、超深井钻杆选材及可靠性设计提供基础数据和理论依据。
In order to solve fatigue fracture of drilling tools, fatigue property of 165ksi and S135 drill pipe steels is studied by rotary bending fatigue test?Based on Basquin model, fatigue limit distribution of middle?long life zone is proposed for two high?strength drill pipe steels?Research results show that, under confidence level of 95% and reliability of 50%, 90% and 99%, the fatigue limit of 165ksi drill pipe steel is respectively 662?54, 645?92 and 632?28 MPa and that of S135 drill pipe steel is respectively 595?83, 541?87 and 529?73 MPa?In ad?dition, a complete stress?fatigue life S?N curve is obtained for two high?strength drill pipe steels?The results can provide basic data and theoretical basis for drill pipe material selection and reliability design of deep wells and ex?tradeep wells.
出处
《石油机械》
2016年第5期18-21,共4页
China Petroleum Machinery
基金
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05005-006)
