表面技术2017，Vol.46Issue(1)：211-217,7.DOI:10.16490/j.cnki.issn.1001-3660.2017.01.034
不同材质油套管钢的CO2腐蚀行为
CO2 Corrosion Behavior of Oil Casing Steel Made from Different Materials
摘要
Abstract
In light of difference in CO2 corrosion behavior of different steel casings, the work aims to explore CO2 corrosion characteristics of conventional steel materials under different corrosion conditions in order to optimize economical CO2 corro-sion resistant oil casings. With formation water of actual oilfield as corrosive medium, simulation experiment was performed to oil casings made from different materials. Morphology characteristics of corrosion products on the surface of corrosion samples were analyzed by X-ray diffractometer so as to study the influences of CO2 partial pressure, temperature and test period on cor-rosion rate of oil casings. With the increase of CO2 partial pressure, the corrosion rate of normal carbon steel and low Cr steel changed significantly; at the CO2 partial pressure of 0.3 MPa, corrosion rate of normal carbon steel was 2.2021 mm/a and 13Cr as low as 0.1052 mm/a, showing no obvious law; as temperature increased, the corrosion rate firstly increased then decreased, corrosion rate of steel N80 and 1Cr steel was far higher than that of 13Cr steel. Corrosion rate of steel N80, 1Cr and 3Cr oil cas-ings increased slightly in shorter test period and decreased significantly as the test period increased continuously; as for corro-sion morphology, normal carbon steel sample was subject to serious corrosion and mainly uniform corrosion. There was a small amount of local light spots with local corrosion on the surface of 1Cr and 3Cr steel; the surface of 13Cr steel was smooth, glos-sy, pitting-free and slightly corroded was. The influence of corrosion rate of normal steel on CO2 partial pressure is more sensi-tive than that of Cr alloy steel. Temperature and test period have influences on corrosion products on the surface of metal. With the continuous increase of temperature and test cycle, FeCO3 protection film takes shape on the surface of metal. A passivation film takes shape on the surface of steel containing Cr due to enrichment of Chromium, which has inhibited the corrosion rate of oil casings. The research has theoretical guiding significance on material selection of oil casings in CO2 corrosion environment.关键词
CO2腐蚀/腐蚀速率/腐蚀形貌/影响因素/耐腐蚀性/油套管Key words
CO2 corrosion/corrosion rate/corrosion morphology/influence factors/corrosion resistance/oil casings分类
矿业与冶金引用本文复制引用
谢涛,林海,许杰,窦蓬,陈毅,刘海龙..不同材质油套管钢的CO2腐蚀行为[J].表面技术,2017,46(1):211-217,7.基金项目
总公司科技重大专项(YXKY-2015-TJ-04) Supported by Science Fund for CNOOC Science and Technology Major Projects(YXKY-2015-TJ-04) （YXKY-2015-TJ-04）
