南马庄油田地面集输管线腐蚀机理研究  

Study on Corrosion Mechanism of Ground Gathering Pipeline in Nanmazhuang Oilfield

作　　者：焦凯 杨婧 姚佳杉 盛楠 冯文洪 JIAOKai;YANGJing;YAOJiashan;SHENGNan;FENGWenhong(No.1 Oil Production Plant,PetroChina Huabei Oilfield Company,Renqiu 062550,China)

机构地区：[1]中国石油华北油田公司第一采油厂,河北任丘062550

出　　处：《热加工工艺》2024年第14期147-150,154,共5页Hot Working Technology

基　　金：陕西省自然科学基础研究计划项目(2021JQ-600);陕西省教育厅科研计划项目资助项目(21JK0841)。

摘　　要：针对南马庄油田地面集输管线腐蚀穿孔严重的问题,对4条集输管线输送的采出水组成进行分析,通过失重法测定20碳钢在其中的平均腐蚀速率,并对腐蚀产物膜和点蚀坑进行表征。结果表明:南马庄油田采出水呈中性或弱碱性,Cl-和HCO_(3)-含量高,可能造成腐蚀和碳酸盐结垢;采出水对20钢的平均腐蚀速率较低(<0.076 mm/a),但存在严重的点蚀,最大点蚀深度在66~97μm,点蚀系数>50;造成点蚀的主要原因为腐蚀产物膜不完整、Cl-和CO_(2)腐蚀。结合地面管线腐蚀形貌,建立了南马庄油田地面集输管线腐蚀机理模型,并阐述了其机理。Aiming at the serious corrosion and perforation of surface gathering and transportation pipelines in Nanmazhuang oilfield,the composition of produced water transported by four gathering and transportation pipelines was analyzed.The average corrosion rate of 20 carbon steel was measured by weight loss method,and the corrosion product film and pitting pits were characterized.The results show that the produced water of Nanmazhuang oilfield is neutral or weakly alkaline,and the content of Cl-and HCO_(3)-is high,which may cause corrosion and carbonate scaling.The average corrosion rate of produced water to 20^(#)steel is low(<0.076 mm/a),but there is serious pitting corrosion.The maximum pitting depth is 66μm-97μm,and the pitting coefficient is more than 50.The main causes of pitting corrosion are incomplete corrosion product film,Cl-and CO_(2)corrosion.Combined with the surface pipeline corrosion morphology,the corrosion mechanism model of surface gathering pipeline in Nanmazhuang oilfield is established,and its mechanism is described.

关 键 词：南马庄油田 集输管线 腐蚀 20碳钢 机理模型 

分 类 号：TG178[金属学及工艺—金属表面处理]