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某注水井P110油管外腐蚀穿孔原因分析

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  • 1中国石油化工股份有限公司西北油田分公司; 2安科工程技术研究院(北京)有限公司; 3北京科技大学新材料技术研究院

网络出版日期: 2025-07-09

Cause Analysis of External Corrosion Perforation Failure of P110 Tubing in a Water Injection Well

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  • 1. Northwest Branch Company of Sinopec, Urumqi 830011, China;2. Safetech Research Institute (Beijing) Co., Ltd., Beijing 100083, China;3. Institute for Advanced Materials and Technology, University of Science and Technology Beijing , Beijing 100083, China

Online published: 2025-07-09

摘要

 通过对注水井腐蚀穿孔油管进行宏观形貌、材质性能及腐蚀产物成分的分析,结合服役工况调研和油管中性点计算,对注水井P110油管外腐蚀穿孔原因进行了探讨。研究结果表明:全井深油管仅腐蚀穿孔P110油管出现明显局部腐蚀,且失效油管腐蚀形貌呈“溃疡状”,同时该失效油管位于中性点以下,处于正弦屈曲状态;穿孔油管材质性能符合标准API SPEC 5CT-2011对P110钢的要求,油管外壁腐蚀产物主要为FeOOH和CaCO3。因此,P110油管在屈曲状态下与套管接触形成缝隙,而后发生缝隙腐蚀失效。腐蚀类型为吸氧腐蚀,腐蚀主控因素为缝隙效应和溶解氧含量,腐蚀机理为闭塞电池的酸化自催化效应。

本文引用格式

李芳, 杨志文, 曾文广, 高亮, 张江江, 张雷, 路民旭 . 某注水井P110油管外腐蚀穿孔原因分析[J]. 材料保护, 2021 , 54(7) : 155 . DOI: 10.16577/j.cnki.42-1215/tb.2021.07.028

Abstract

The macromorphology, material properties and corrosion products composition of the corrosive perforated P110 tubing in a water injection well were characterized. Combined with the investigation of service conditions and tubing neutral point calculation, the reason of external corrosion perforation in the water injection well was analyzed. Results showed that the obvious localized corrosion morphology only appeared on the corrosion perforation P110 tubing among the whole well depth tubing, more specifically, the failed tubing’s corrosion morphology was ulcerative. Meanwhile the failed tubing was under the tubing’s neutral point and in sinusoidal buckling. The material properties of the perforated tubing met the requirements of P110 steel in API SPEC 5CT-2011. The tubing external corrosion products were mainly FeOOH and CaCO3. It was indicated that in the buckling state, P110 tubing and casing contacted to form a gap, and then crevice corrosion failure occurred. The corrosion type was oxygen absorption corrosion, and the main factors of corrosion were gap effect and dissolved oxygen content. The corrosion mechanism was the acidification autocatalytic effect of occluded corrosion cell.
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