集输工况对X65钢管道H_(2)S-CO_(2)腐蚀行为的影响  

Effects of Gathering and Transportation Condition on H_(2)S-CO_(2) Corrosion Behavior of X65 Steel Pipeline

作　　者：张维智 唐德志[4] 谷坛 韩恩厚[1,2] ZHANG Weizhi;TANG Dezhi;GU Tan;HAN Enhou(School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China;PetroChina Oil&Gas and New Energy Company,Beijing 100007,China;PetroChina Planning and Engineering Institute,Beijing 100083,China)

机构地区：[1]中国科学技术大学材料科学与工程学院,合肥230026 [2]中国科学院金属研究所,沈阳110016 [3]中国石油天然气股份有限公司油气和新能源分公司,北京100007 [4]中国石油天然气股份有限公司规划总院,北京100083

出　　处：《腐蚀与防护》2025年第3期15-25,36,共12页Corrosion & Protection

基　　金：中国石油天然气股份有限公司重点科研项目(2022KT2501)。

摘　　要：采用室内腐蚀模拟试验,研究了含硫气田不同集输工况条件(集输温度、运行压力,HCO_(3)^(-)、Ca^(2+)、Mg^(2+)、Cl^(-)含量以及pH)对X65钢管道H_(2)S-CO_(2)腐蚀行为的影响。结果表明:随着集输温度和运行压力的升高,H_(2)S-CO_(2)腐蚀速率逐渐增大,其中运行压力对H_(2)S-CO_(2)腐蚀速率的影响最显著;随着Ca^(2+)、Mg^(2+)、HCO_(3)^(-)含量以及pH的增大,腐蚀产物致密性提高,腐蚀速率逐渐降低;随着Cl^(-)含量的增大,局部腐蚀倾向增大,均匀腐蚀速率先增大后减小,在Cl^(-)质量浓度为10 g/L时出现峰值;pH在一定程度上可以反映管道H_(2)S-CO_(2)腐蚀情况,但仅考虑pH难以合理评估其腐蚀严重程度。试验条件下,H_(2)S-CO_(2)腐蚀产物主要由马基诺矿和磁黄铁矿组成,试样表面形成了微区电偶,在微区电偶和闭塞电池的作用下,发生和发展了局部腐蚀。The indoor corrosion simulation experiment was used to study the influence of different gathering and transportation conditions(gathering temperature,pipeline operating pressure,HCO_(3)^(-),Ca^(2+),Mg^(2+),Cl^(-)content and pH)on H_(2)S-CO_(2) corrosion behavior of X65 steel pipeline in a sulfur-containing gas field during its daily production and transmission.The results show that with the increase of temperature and pressure,the corrosion rate gradually increased,and operating pressure had the most significant effect on it.As Ca^(2+),Mg^(2+),HCO_(3)^(-) content and pH increased,the density of corrosion products increased,and the corrosion rate gradually decreased.As the Cl^(-)content increased,the tendency of localized corrosion increased,uniform corrosion rate soared up at first and then droped,peaking when Cl^(-)concentation was 10 g/L.In a certain range,pH could response to H_(2)S-CO_(2) corrosion rate in gathering pipelines,but it was difficult to reasonably evaluate the corrosion severity by only considering the pH.Under experimental conditions,H_(2)S-CO_(2) corrosion products were mainly composed of Maginot ore and magnetic pyrite.The surface of the sample formed a longitudinal multi-region electro couple.Furthermore,the effects of the micro-zone electro couple and the occlusion battery led to the occurrence and development of localized corrosion.

关 键 词：集输工况 H_(2)S-CO_(2)腐蚀 pH 腐蚀机理 

分 类 号：TG174[金属学及工艺—金属表面处理]