摘要
为查明S135钢级钻杆接头的耐磨带区域发生刺漏的原因,分析该接头的理化性能、宏观组织、裂纹金相组织以及断口形貌。分析结果表明:在堆焊接头耐磨带时,因热处理工艺不当,在耐磨带上产生了周向裂纹,甚至部分周向裂纹已经延伸到接头本体上,这是引起该钻杆接头发生早期刺漏失效的主要原因;此外,抗卡瓦挤毁钻杆由于壁厚较大,在通过浅定向井造斜点时,接头外壁所产生的弯曲应力也较大,使得已存在的裂纹扩展迅速发生。
Analyzed here in the essay are the physioehemical properties,the macrostructure,the metallographie structure of the crack and the fracture morphology of the S135 drill pxpe joint in order to find out the causes for the washout failure of the hardbanding area thereof.As a result,it is identified that the root cause for the early-happened washout is that when welding the hardbanding with the build-up process,owing to some improper heat treatment method as employed, circumferential cracks occur on the hardbanding,and part of the cracks has even extended into the joint body.Moreover when the anti-slips-collapse drill pipe is passing by the kick-off point of the shallow directional well,due to its large wall thickness,the bending stress as produced by the outer wall of the joint is rather large,which makes the existing cracks rapidly extending.
作者
陈猛
余世杰
欧阳志英
CHEN Meng;YU Shijie;OUYANG Zhiying(Shanghai Hilong Petroleum Tubular Goods Research Institute,Shanghai 200949,China;Southwest Petroleum University,Chengdu 610500,China)
出处
《钢管》
CAS
2018年第6期45-49,共5页
Steel Pipe
关键词
钻杆
接头
耐磨带
周向裂纹
刺漏
疲劳扩展
drill pipe
joint
hardbanding
circumferential crack
washout
fatigue extension
