苏东区块X-59A井油管失效原因分析  

Failure Cause Analysis and Suggestion on Tubing of X-59A Well in Sudong Block

作　　者：赵雪会 刘君林 谢文江 李明星[3] 李程 于淑珍[3] ZHAO Xuehui;LIU Junlin;XIE Wenjiang;LI Mingxing;LI Cheng;YU Shuzhen(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Drilling and Production Technology Research Institute of Qinghai Oilfield,Dunhuang,Gansu 736202,China;Research Institute of Oil and Gas Technology of Changqing Oilfield Company,Xi′an,Shaanxi 710021,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [2]中国石油天然气股份公司青海油田分公司钻采工艺研究院,甘肃敦煌736202 [3]长庆油田分公司油气工艺研究院,陕西西安710021

出　　处：《石油管材与仪器》2022年第6期64-69,共6页Petroleum Tubular Goods & Instruments

基　　金：国家自然科学基金青年科学基金项目“超级13Cr油管表面全覆盖半导体预钝化膜制备及其对不锈钢点蚀坑生长行为影响机理研究”(编号:51904331);陕西省创新能力支撑计划项目“油气田腐蚀与安全创新团队”(编号:2019TD-038)。

摘　　要：通过对苏东区块X-59A井油管腐蚀失效影响因素的分析,确定服役约7年的开发井不同井段油管腐蚀损伤及穿孔失效原因。用金相显微镜、扫描电镜(SEM)以及能谱仪等进行试验分析,对现场提取的三种环境下失效的油管进行宏观形貌、微观形貌及腐蚀特征综合分析。结果表明,穿孔失效油管位于服役温度约为80℃的井深处,该区域油管的内壁和外壁均发生了较严重的腐蚀。油管失效模式主要为内腐蚀起源向外发展至穿孔失效,接箍内壁空腔残留腐蚀介质是导致油管外螺纹端面腐蚀损伤的主要原因。Through the analysis of the influential factors of tubing corrosion failure of X-59A well in Sudong block,this paper intends to clarify the tubing corrosion damage and perforation failure causes of different sections in development wells that have been in service for about 7 years.By means of metallographic microscope,scanning electron microscope(SEM)and energy dispersive spectrometer,the macroscopic morphology,microscopic morphology and corrosion characteristics of the failed tubing in three environments were comprehensively analyzed.The results show that the perforatedly failed tubing is located in the depth of the well where the service temperature is about 80℃,and the pit corrosion of the inner and outer wall of the pipe string is serious.The failure mode of tubing is mainly the propergation of internal corrosion resulting in perforation failure.The residual corrosive medium in the inner cavity of the coupling is the main reason for the corrosion damage of the tubing pin end face.

关 键 词：油管 腐蚀穿孔 失效 内腐蚀 

分 类 号：TE931[石油与天然气工程—石油机械设备]