摘要
为了便于发现和解决作业过程中可能发生的钻杆损伤或失效等结构完整性破坏问题,采用有限元数值方法构建了某型号钻杆的三维模型,根据该钻杆实际工作情况,分别取压扭、压弯和压扭弯3种典型复合载荷工况,又分别在2种钻压、2种扭矩和3种弯曲载荷组合的工况下,仿真获取了钻杆的变形场、von Mises应力场和von Mises应变场分布,由此确定了该型钻杆的刚度与强度,进而评估钻杆的结构完整性。分析结果表明:在各种压扭组合载荷工况中,该钻杆的最大变形率为0.08%,最大von Mises应力位于钻杆后端仪器舱穿线孔壁处,屈服安全系数为1.56;在各压弯和压扭弯组合载荷工况时,其最大变形率分别为2.25%和2.28%,最大von Mises应力均位于前端仪器舱穿线孔壁处,屈服安全系数分别为1.94和1.70。该型钻杆的结构完整性满足要求。所得方法与结论可为钻杆的数值计算以及结构完整性分析提供理论与技术参考。
In order to facilitate the identification and resolution of potential structural integrity destruction issues such as drill pipe damage or failure during the operation process,the finite element numerical method was used to build a 3D model of a drill pipe.Then,based on the actual working conditions of the drill pipe,typical combined load conditions such as WOB-torque,WOB-bending and WOB-torque-bending were selected to conduct simulation and obtain the distribution of deformation field,von Mises stress field and von Mises strain field of the drill pipe under the combined conditions of 2 WOBs,2 torques and 3 bending loads respectively.Finally,the stiffness and strength of the drill pipe were determined,and the structural integrity of the drill pipe was evaluated.The analysis results show that under various WOB-torque combined load conditions,the maximum deformation rate is 0.08%,the maximum von Mises stress is located at the wall of pore for threading of instrument bay at the rear end of the drill pipe,and the yield factor of safety is 1.56;under various WOB-bending and WOB-torque-bending combined load conditions,the maximum deformation rate is 2.25%and 2.28%respectively,the maximum von Mises stress is all located at the wall of pore for threading of instrument bay at the front end of the drill pipe,and the yield factor of safety is 1.94 and 1.70 respectively;and the structural integrity of the drill pipe meets the requirements.The obtained methods and conclusions provide theoretical and technical references for numerical calculation and structural integrity analysis of drill pipes.
作者
秦才会
李国玉
朱玉宁
曹云风
郭宇
Qin Caihui;Li Guoyu;Zhu Yuning;Cao Yunfeng;Guo Yu(China Oilfield Services Limited;College of Aerospace Science and Engineering,National University of Defense Technology)
出处
《石油机械》
北大核心
2023年第10期59-66,共8页
China Petroleum Machinery
基金
中国海洋石油集团有限公司科技项目“随钻地层测压及电阻率探边仪器系列化扩充”(CNOOC-KJ 135 ZDXM 20ZHYF 2020-1)。
