Φ101.60 mm×9.19mm規(guī)格S135鉆桿刺漏失效分析

Analysis of Piercing Failure of Φ101.60 mm×9.19 mm S135 Drill Pipe

摘要: 采用幾何尺寸測量、刺漏裂口形貌分析、力學(xué)性能測試等方法，結(jié)合鉆桿的受力狀態(tài)和使用工況，分析了S135鉆桿刺漏的原因，并提出了5點(diǎn)預(yù)防措施。分析認(rèn)為：S135鉆桿刺漏屬于早期腐蝕疲勞失效；在腐蝕和拉壓、彎曲、扭轉(zhuǎn)等載荷的作用下，S135鉆桿壁厚偏薄處的外表面腐蝕坑底部首先出現(xiàn)疲勞裂紋，并擴(kuò)展導(dǎo)致鉆桿刺漏。

Abstract: Analyzed in the essay are the causes for the piercing failure of the S135 drill pipe by means of methods like geometric dimension measurement，piercing fracture morphology analysis and mechanical property testing，and consideration of the loading state and the service conditions of the drill pipe.Accordingly，five preventative actions are proposed.The analysis result leads to the following conclusion.The piercing of the drill pipe is regarded as an early-stage corrosion fatigue failure.And the reason for such failure is that under corrosion，and such loads as tension and compression，bending and torsion，fatigue cracks first occurred at the bottom of the corrosion pit on the external surface of the rather thinner part of the drill pipe，and then expanded to eventually get the drill pipe pierced.