P110油管腐蚀穿孔原因分析  

Causes Analysis on Corrosion Perforation of a P110 Oil Tube

作　　者：周波[1] 朱建雷[2] 李宁[1] 张国正[2] 杨成新[1] 程春杰[1] 

机构地区：[1]塔里木油田分公司,库尔勒841000 [2]西安摩尔石油工程实验室股份有限公司,西安710065

出　　处：《理化检验（物理分册）》2016年第5期335-338,344,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：中石油天然气股份有限公司2013年前期评价资助项目

摘　　要：某油井在起甩管柱作业过程中,P110油管因腐蚀穿孔发生断裂,严重影响施工作业。为了明确油管腐蚀穿孔的原因,分别对油管穿孔处的宏观形貌、化学成分及显微组织进行分析,并采用扫描电镜对穿孔处内外壁的形貌进行观察,利用能谱仪和X射线衍射仪分析内外壁腐蚀产物的主要元素成分。结果表明:在酸性高Cl-的腐蚀介质中,油管内壁涂层针孔处发生点蚀,导致油管穿孔,进而发生冲刷腐蚀,加快了油管腐蚀速率。The corrosion perforation of a P110 oil tube occurred in a certain well,causing the fracture of the oil tube.The construction work was influenced seriously.In order to find out the reasons of corrosion perforation of the oil tube,the macro morphology,chemical composition and microscopy microstructure of the perforation position were analyzed.The micro morphology of the inner wall and outer wall of the perforation position was observed by scanning electron microscope,and corrosion products were observed by SEM,and the main element compositions of corrosion products of the inner wall and outer wall were analyzed by energy dispersive spectroscopy and X-ray diffractometer.The results show that in the acidic and high Cl-corrosion medium,pitting corrosion occurred in the pin holes defects of coating on the inner wall of the oil tube,resulting in the tube perforation,and then the erosion corrosion happened,accelerating the corrosion rate of the oil tube.

关 键 词：P110油管 断裂 点蚀 冲刷腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理] TE983[金属学及工艺—金属学]