含表面双裂纹的钻杆管体断裂性能研究  

Study on fracture behavior of drill pipe bodywith surface double cracks

作　　者：张智亮[1,2] 林莹莹 钱光阳 李文军 李安军 ZHANG Zhiliang;LIN Yingying;QIAN Guangyang;LI Wenjun;LI Anjun(School of Mechatronic Engineering,Southwest Petroleum University,610500 Chengdu,China;Sichuan Zhongliyuan Construction Engineering Co.,Ltd.,610044 Chengdu,China;Southwestern Pipeline Co.,Ltd.,State Pipeline Network Group,610213 Chengdu,China;Petro China Urumqi Petrochemical Company,831400 Urumqi,China;Western Pipeline Co.,Ltd.,State Pipeline Network Group,831400 Urumqi,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]四川中利源建设工程有限公司,成都610044 [3]国家管网集团西南管道有限责任公司,成都610213 [4]中国石油乌鲁木齐石化分公司,乌鲁木齐831400 [5]国家管网集团西部管道有限责任公司,乌鲁木齐831400

出　　处：《应用力学学报》2024年第3期516-523,共8页Chinese Journal of Applied Mechanics

基　　金：国家重点基础研究发展计划资助项目(No.2012CB215004);国家科技重大专项课题资助项目(No.2011ZX05021-001);中国博士后科学基金资助项目(No.2019M663865)。

摘　　要：钻杆刺漏是钻杆在服役过程中最常见的失效形式,而钻杆表面裂纹的扩展是钻杆发生刺漏的直接原因。为更有效地评估钻杆表面含有多条裂纹时的安全性能,以某超深直井G105钻杆井口段为研究对象,建立管体外表面双裂纹有限元模型,分析了拉扭载荷下裂纹间距、次裂纹尺寸以及走向对环向主裂纹前缘J积分的影响。结果表明:轴向排列的环向次裂纹是相对最安全的,可大幅消减钻杆主裂纹前缘的J积分;环向排列的环向次裂纹相对最危险,可大幅增大钻杆主裂纹前缘的J积分;轴向次裂纹可增大钻杆主裂纹前缘或部分前缘的J积分,但增幅相对环向排列的环向次裂纹来说要微弱得多。次裂纹对主裂纹前缘J积分的影响强度随两裂纹间距的增大或次裂纹尺寸的减小而减小。因此在对含表面双裂纹的钻杆进行分析时,在次裂纹尺寸较大且距离较近的情况下应考虑次裂纹的影响;在次裂纹尺寸较小或距离较远时则可忽略次裂纹,将模型简化为单裂纹钻杆模型进行分析。Drilling pipe leakage is the most common failure form of drilling pipe in service,and the expansion of surface crack of drilling pipe is the direct cause of drilling pipe leakage.In order to evaluate the safety performance of drill pipe with multiple cracks on the surface,a finite element model of double cracks on the surface of drill pipe was established by taking the wellhead section of G105 drill pipe of an ultra-deep vertical well as the research object.The effects of crack spacing,crack size and strike on the J-integral at the leading edge of the circular main crack under tensile and torsional loading were analyzed.The results show that the circumferential secondary cracks arranged in the axial direction are relatively the safest,which can greatly reduce the J-integral of the leading edge of the main crack.The circumferential secondary cracks arranged in the circumferential direction are the most dangerous,which can greatly increase the J-integral of the leading edge of the main crack.The axial secondary cracks can increase the J-integral of the leading edge or part of the leading edge of the main crack in the drill pipe,but the increase is much weaker than that of the circumferential secondary cracks.The influence intensity of secondary cracks on the leading edge J-integral of the main crack decreases with the increase of the distance between two cracks and the decrease of the size of secondary cracks.Therefore,the influence of secondary cracks should be considered when the size of secondary cracks is large and the distance between them is relatively close.When the size of the secondary crack is small or the distance is long,the secondary crack can be ignored,and the model is simplified to a single-crack drill pipe model for analysis.

关 键 词：钻杆 双裂纹 J积分 安全评估 

分 类 号：TE921[石油与天然气工程—石油机械设备]