新疆油田稠油火驱采出井N80油管腐蚀失效分析  

Corrosion failure analysis of N80 tubing in heavy oil fire-drive production well in Xinjiang oilfield

作　　者：陈登亚 邹俊刚[2] 余成秀 孙江河 向红 曾德智[3] CHEN Dengya;ZOU Jungang;YU Chengxiu;SUN Jianghe;XIANG Hong;ZENG Dezhi(Oil Production Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,China;No.1 Oil Production Plant of PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,China)

机构地区：[1]中国石油新疆油田分公司采油工艺研究院 [2]中国石油新疆油田分公司采油一厂 [3]油气藏地质及开发工程全国重点实验室·西南石油大学

出　　处：《石油与天然气化工》2024年第6期88-94,共7页Chemical engineering of oil & gas

基　　金：国家自然科学基金“静载、振动与腐蚀作用下H_(2)S/CO_(2)气井完井管柱螺纹密封面的力化学损伤机制研究”(51774249)。

摘　　要：目的厘清新疆油田稠油火驱某采出井N80油管的腐蚀失效原因,明确腐蚀主控因素和腐蚀机理。方法分析了火驱井油管服役井史和宏观腐蚀形貌,检验了失效油管的化学成分、金相组织和力学性能,利用扫描电镜、能谱仪、X射线衍射仪对腐蚀产物进行物相分析。结果失效油管的化学成分、力学性能均符合相关标准要求,金相组织无异常;油管以局部腐蚀为主,服役仅1年油管外径减少了1.89 mm;腐蚀产物层厚度达96μm,主要由Fe_(2)O_(3)、FeCO_(3)和FeOOH组成。结论失效油管发生了高温环境下的CO_(2)腐蚀和O_(2)腐蚀,O_(2)和Cl^(-)的协同作用是导致油管局部腐蚀发展的主要原因,建议采用铝合金牺牲阳极短节进行防护,研究成果为火驱环境油管柱的腐蚀与防护提供了借鉴。Objectives To clarify the corrosion failure causes of N80 tubing in a production well of heavy oil fire flooding in Xinjiang oilfield,and to identify the main control factors and corrosion mechanism.Methods The service history and macroscopic corrosion morphology of the fire-drive production well tubing were analyzed.The chemical composition,metallographic structure and mechanical properties of the failed tubing were analyzed.The corrosion products were analyzed by SEM,EDS and XRD.Results The chemical composition and mechanical properties of the failed tubing were in line with the relevant standards,and the metallographic structure was normal.The oil pipe was mainly corroded locally,and the outer diameter of the oil pipe was reduced by 1.89 mm after only 1 year of service.The corrosion product layer has a thickness of 96μm and is mainly composed of Fe_(2)O_(3),FeCO_(3) and FeOOH.Conclusions CO_(2) corrosion and O_(2) corrosion have occurred in the failed tubing at high temperatures,and the synergistic effect of O_(2) and Cl^(-) was the main cause leading to the development of local corrosion in the tubing.It is recommended that Al alloy sacrificial anode short sections be used for protection,and the research results provide a reference for the corrosion and protection of tubing string in fire-drive environment.

关 键 词：N80油管 火驱 CO_(2)腐蚀 O_(2)腐蚀 失效分析 

分 类 号：TE983[石油与天然气工程—石油机械设备]