P110级管材在含氢储气库环境中的腐蚀行为  

Corrosion behavior of P110 pipe in the environment of hydrogen-containing gas storage

作　　者：张弘 袁光杰 万继方 张施琦 李景翠 刘天恩 庞宇晗 ZHANG Hong;YUAN Guangjie;WAN Jifang;ZHANG Shiqi;LI Jingcui;LIU Tian'en;PANG Yuhan(CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan,Hubei 430081,China)

机构地区：[1]中国石油集团工程技术研究院有限公司 [2]武汉科技大学耐火材料与冶金国家重点实验室

出　　处：《天然气工业》2022年第11期117-123,共7页Natural Gas Industry

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“盐穴压缩空气与氢气储能工程关键技术研究”(编号:2021DJ5402);中国石油科技创新基金项目“基于复合微合金化的抗应力腐蚀高强度油井管钢的设计与改性机理研究”(编号:2020D-5007-0311)。

摘　　要：随着氢能的快速发展,掺氢天然气输送正在加大推广,储气库作为“天然气银行”,其安全平稳运行至关重要。为了揭示储气库井管材在含氢天然气环境中的氢应力腐蚀机制,通过慢应变速率拉伸(SSRT)与氢渗透试验,研究对比了2种P110级油套管钢在模拟含氢环境下的应力腐蚀行为,并结合试样的晶体结构与显微组织分析了2种试样钢应力腐蚀行为差异的来源。研究结果表明:①在含氢储气介质条件下,P110级油套管钢的应力腐蚀断裂(SCC)为氢致弱键(HEDE)和氢促进局部塑性变形(HELP)的混合氢脆机制;②具有相近的化学成分和常规力学性能的2种试验钢由于具有不同的组织、氢陷阱密度和晶体学特征,SCC敏感性显著不同;③表现出更优异SCC抗力的试验钢具有更细的回火马氏体组织,这增加了钢中氢陷阱密度和抑制缺陷处局部氢富集,抑制了SCC裂纹形成,其具有更低的Σ3界面比例、更低的平均泰勒因子,以及更高的小角度晶界分布(LAGB),增加了SCC裂纹扩展阻力。结论认为,含氢环境下P110级管材的腐蚀行为研究,为含氢天然气储气库和储氢库的井管柱选材和延寿提供了指导,该认识将有助于储气库建设、运维等工程技术方面的持续优化和完善。With the rapid development of hydrogen energy,hydrogen-blending natural gas transportation is being promoted.As a"natural gas bank",the safe and smooth operation of gas storage is very important.To reveal the hydrogen stress corrosion mechanism of gas storage well pipes in a hydrogen-containing natural gas environment,this paper comparatively studies the stress corrosion behaviors of two kinds of P110 tubing and casing steel in the simulated hydrogen-containing environment by means of slow strain rate tension(SSRT)and hydrogen permeation test.Then the reasons for different stress corrosion behaviors of two steel samples are analyzed from the aspects of crystalline structure and microstructure.And the following research results are obtained.First,under the condition of hydrogencontaining gas storage medium,the stress corrosion cracking(SCC)of P110 tubing and casing steel follows the mixed hydrogen brittleness mechanism of hydrogen-enhanced decohesion(HEDE)and hydrogen-enhanced local plasticity(HELP).Second,the two kinds of test steel have similar chemical composition and conventional mechanical properties,but they are significantly different in SCC sensitivity due to their differences in structure,hydrogen trap density and crystallographic characteristics.Third,the test steel with better SCC resistance has a finer tempered martensitic structure,which increases the hydrogen trap density and inhibits the local hydrogen enrichment at defects,so as to inhibit the formation of SCC.It has a lowerΣ3 boundary fraction,a lower average Taylor factor,and a higher low-angle grain boundary(LAGB),which increases the resistance to the propagation of SCC cracks.In conclusion,the studies on the corrosion behaviors of P110 pipe in a hydrogen-containing environment provide guidance for the selection and life extension of well pipe strings in hydrogen-containing natural gas storages and hydrogen storages.The results are conducive to the continuous optimization and improvement of gas storage construction,operation maintenance and oth

关 键 词：储气库 P110级管材 含氢储气介质 应力腐蚀断裂 氢陷阱密度 显微组织 晶体学特征 腐蚀行为 

分 类 号：TE972[石油与天然气工程—石油机械设备]