某油田在钻杆下井作业前的检测中发现2支镀镍钻杆内壁腐蚀严重，为了查明此次钻杆腐蚀的原因，对钻杆内壁腐蚀产物进行了形貌宏观和微观分析，微区成分分析。结果表明，镀镍钻杆内镀层存在漏镀与显微孔洞是钻杆产生腐蚀的主要原因；原油中的H2 S溶解于水形成氢硫酸加速钻杆腐蚀，且氯离子的存在使得局部腐蚀进一步加剧。建议规范生产流程，改善镀层质量，避免镀层中存在漏镀或孔洞等缺陷，提高钻杆的抗腐蚀能力。
Before drilling down operation,severe internal corrosion was discovered in two nickel-plated drill pipes. In order to find out the causes of the drill pipe corrosion,macro and micro morphology analysis,micro-composition analysis of corrosion product were taken.The results showed that the presence of leaks and microscopic pores on nickel plated layer were the main reasons which leaded to drill pipe corrosion.H2 S of crude oil dissolved in water and formed hydrosulphuric acid and thus also accelerated drill pipe corrosion,and the presence of chloride ions made the localized corrosion further.Standardizing the production process,improving the quality of plated-layer,and avoiding the leaks,microscopic pores or other defects in plated-layer were proposed to improve the corrosion resistance of drill pipe.
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