Page 88 - 理化检验-物理分册2024年第十二期

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质量控制与失效分析 DOI:10.11973/lhjy-wl240228

J55 套管断裂原因

袁 琴 ，陈志刚 ，李琳琳 ，廖德勇 ，王善宝 1,2
1,2
3
1,2
3
（1.海洋装备用金属材料及其应用国家重点实验室，鞍山 114009；2.鞍钢集团钢铁研究院，鞍山 114009；

3.鞍钢股份大型总厂， 鞍山 114009）
摘 要：某水井在开采时采用规格为 177.8 mm×6.91 mm（外径×壁厚，下同）的J55 套管
代替设计要求的规格为 177.8 mm×8.05 mm 的 J55 套管进行固井，在下井过程中规格为
177.8 mm×6.91 mm的J55套管发生断裂现象，采用宏观观察、化学成分分析、力学性能测试、金相
检验、扫描电镜分析等方法对套管断裂原因进行分析。结果表明：断裂J55套管试样基体组织为珠
光体+网状铁素体，断口附近组织存在较严重的混晶现象，且断口处的钢管外表面存在细小裂纹，
在超设计使用过程中，钢管所承受的拉力和扭转力达到了钢管截面实际所能承受的极限值，同时钢
管外表面局部存在的细小裂纹成为起裂源，裂纹在外力的作用下沿粗大晶粒向内表面扩展，最终导
致套管断裂。
关键词： J55套管；断裂；混晶组织；裂纹；扭转力
中图分类号：TG115.2；TB31 文献标志码：B 文章编号：1001-4012(2024)12-0072-04
Causes of J55 casing fracture

YUAN Qin , CHEN Zhigang , LI Linlin , LIAO Deyong , WANG Shanbao 1,2
3
1,2
3
1,2
(1.State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China;
2.Ansteel Iron & Steel Research Institutes, Anshan 114009, China; 3.The Heavy Steel Rolling Plant
of Angang Steel Co., Ltd., Anshan 114009, China)
Abstract: The J55 casing with a specification of 177.8 mm × 6.91 mm (outer diameter × wall thickness,
the same below) was used to replace the J55 casing with a specification of 177.8 mm × 8.05 mm for cementing
during the exploitation of a water well. The J55 casing with a specification of 177.8 mm × 6.91 mm fractured during
the well drilling process. The macroscopic observation, chemical composition analysis, mechanical property test,
metallographic examination, scanning electron microscopy analysis and other methods were used to analyze the causes
of casing fracture. The results show that the matrix structure of the fractured J55 casing sample was pearlite plus
reticular ferrite. There was a serious mixed crystal phenomenon near the fracture, and there were small cracks on the
outer surface of the steel pipe at the fracture. In the process of over-design and use, the tension and torsion force of the
steel pipe reached the limit value that the steel pipe section could actually bear. At the same time, the small cracks on
the outer surface of the steel pipe became the source of crack initiation. Under the action of external force, the cracks
propagated along the coarse grains to the inner surface, which eventually led to the fracture of the casing.
Keywords: J55 casing; fracture; mixed crystal structure; crack; torsion force

油井管是石油、天然气开采过程中的重要部件， 厂家生产的J55钢级油井管材料一般为37Mn5钢。
其中J55钢级油井管占国内油井管总需求量的50％以 由于套管钻井技术的应用以及采油工艺的特殊
上 [1-2] ，J55钢级油井管是石油管材产品中的普通钢级 性，油井管长期在交变载荷下工作，并在多处与抽油
产品，用于地质条件相对较好、井深较浅的环境。国内 杆接箍及杆体发生接触摩擦，加上井内液体腐蚀等

因素的影响，油井管连接螺纹处经常发生疲劳断裂、
收稿日期：2024-08-10
破损、偏磨、腐蚀等现象，严重影响了油田的正常生
作者简介：袁 琴（1984—），女，硕士，高级工程师，主要从事无
产，并造成巨大经济损失 [3-6] 。一般来说，水井的地
缝钢管的新产品开发工作，yuanqin725@163.com
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