螺杆钻具球式万向轴失效分析及改进措施  

FAILURE ANALYSIS ON BALL-TYPE UNIVERSAL JOINT OF PDM DRILL AND IMPROVEMENTS MADE

作　　者：刘璐[1,2] 赵广慧[1] 魏秦文[3] 肖金华[4] 赵莉[1] 任斌[1] 

机构地区：[1]西南石油大学机电工程学院 [2]胜利油田胜机石油装备有限公司 [3]中国石油天然气管道科学研究院 [4]中国石油天然气管道通信电力工程总公司

出　　处：《钻采工艺》2017年第3期71-74,12,共4页Drilling & Production Technology

基　　金：西南石油大学机电工程学院研究生创新基金"非开挖定向穿越超短动力钻具研究"(CX2014SZ02)

摘　　要：针对钢球破碎、花瓣套和连接杆磨损等失效问题,以172螺杆钻具为研究对象,利用ABAQUS软件对钢球和花瓣套进行接触应力分析,得出局部接触应力过大会加速小钢球的磨损以及压溃,这是该类型万向轴小钢球容易失效的主要原因。利用fe-safe软件对花瓣套和连接杆进行疲劳分析,受马达扭矩和轴向力共同作用,花瓣套与小钢球接触的两侧、小钢球与连接杆球窝接触的底部容易发生疲劳失效,该位置也是接触应力较大的位置。为此,提出了针对性的改进建议,降低钢球、花瓣套和连接杆失效概率。The research is focused on the ball crash,petal sleeve wearing and connecting rod wearing of the versal shaft of PDM drill. A contact stress analysis has been made on the steel balls and the petal sleeve of 172 PDM drill by ABAQUS. It is found the excessive local stress and stress concentration has accelerated the abrasion and crash of the steel ball,it's the primary cause of ball failure. Fatigue damage is the main failure type of the PDM,a fatigue analysis of petals and connecting rod is carried out by using FE-SAFE. Under the action of torque and axial force of the PDM,fatigue failure tends to occur at the contact area between the petal sleeve and the steel ball at the 2sides,and at the bottom contact area between the steel ball and the connecting rod socket where the contact stress is rather high.To reduce the failure probability,it is suggested to reduce the axial movement and radial impact of the connecting rod.

关 键 词：螺杆钻具 球式万向轴 失效 接触应力 疲劳分析 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]