φ88.9 mm×6.45 mm 110S某油管接箍台肩变形原因分析  

Analysis of Deformation Failure ofφ88.9 mm×6.45 mm 110S Tubing Coupling Shoulder

作　　者：童亮 吕庆钢 王治国 李新荣 周鹏成 褚清琳 姬丙寅 TONG Liang;LYU Qinggang;WANG Zhiguo;LI Xinrong;ZHOU Pengcheng;CHU Qinglin;JI Bingyin(Sinopec Northwest China Petroleum Bureau,Luntai 841600,China;Xi’an Serv Stress Engineering Technology Service Co.,Ltd.,Xi’an 710075,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,新疆轮台841600 [2]西安三维应力工程技术有限公司,陕西西安710075

出　　处：《钢管》2025年第1期68-74,共7页Steel Pipe

摘　　要：通过宏观形貌检查、材料性能试验、密封面和台肩面的显微形貌观察以及过扭试验等方法分析某失效φ88.9 mm×6.45 mm 110S油管接箍变形事故原因,并通过数学模型计算失效管体工况扭矩。结果表明,此次失效事故是由于在进行解卡和丢手作业过程中对油管施加的工况扭矩过大,使得接箍台肩面过扭屈服;加之失效油管接箍的井下温度在100℃以上,降低了油管接箍材料的自身屈服强度,同时油管在井下复杂的受力状况及可能出现的螺旋屈曲会进一步加剧接箍台肩面屈服,从而导致接箍台肩变形失效。The causes for the deformation failure of the coupling shoulder of theφ88.9 mm×6.45 mm 110S tubing is analyzed by means of macro-morphology inspection,material performance test,micro-morphology analysis of the sealing surface and the shoulder surface,and over-torsion test.And the working torque of the failed tube body is calculated by a mathematical model.The results show that the failure accident is due to the excessive working torque applied to the tubing during the stuck-releasing and string-releasing operations,which makes the shoulder surface of the coupling yielded by over torsion.In addition,the down hole temperature of the failed tubing coupling is above 100℃,which in turn reduces the yield strength of the tubing coupling material.At the same time,the complicated down hole stress condition of the tubing and the possible spiral buckling further aggravate the yield of the coupling shoulder surface,thus inevitably leading to the deformation failure of the coupling shoulder.

关 键 词：油管 接箍台肩 变形 工况扭矩 过扭屈服 温度 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]