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    某井S135鋼級(jí)鉆桿接頭耐磨帶區(qū)域刺漏原因分析

    Analysis of Causes for Washout Failure of Hardbanding Area of S135 Drill Pipe Joint as Hap pened in a Certain Oil Well

    • 摘要: 為查明S135鋼級(jí)鉆桿接頭的耐磨帶區(qū)域發(fā)生刺漏的原因，分析該接頭的理化性能、宏觀組織、裂紋金相組織以及斷口形貌。分析結(jié)果表明：在堆焊接頭耐磨帶時(shí)，因熱處理工藝不當(dāng)，在耐磨帶上產(chǎn)生了周向裂紋，甚至部分周向裂紋已經(jīng)延伸到接頭本體上，這是引起該鉆桿接頭發(fā)生早期刺漏失效的主要原因；此外，抗卡瓦擠毀鉆桿由于壁厚較大，在通過(guò)淺定向井造斜點(diǎn)時(shí)，接頭外壁所產(chǎn)生的彎曲應(yīng)力也較大，使得已存在的裂紋擴(kuò)展迅速發(fā)生。

       

      Abstract: Analyzed here in the essay are the physiochemical properties,the macrostructure,the metallographic structure of the crack and the fracture morphology of the S135 drill pipe 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.

       

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