摘要
为定性研究长庆油田地层水对J55套管的侵蚀性，分别选取了国产和进口的J55套管试样各两种，模拟油田高温高压环境进行腐蚀试验。试验结果表明，试样表面均存在点蚀现象，4种试样的平均腐蚀速率最大为0．130mm／a，最小为0．074mm／a，相差很大。试样表面的腐蚀产物主要是FeS，说明在这种环境中，套管可能同时遭受CO2腐蚀、硫酸盐还原菌腐蚀、H2S腐蚀和垢下腐蚀，其中H2S腐蚀和垢下腐蚀引起的点蚀占主导。同时发现，试样腐蚀速率的差异和试样的金相及成分有密切关系。通过微合金化和提高材料的冶炼水平来降低P和S含量，以及通过适当的热处理使晶粒细化等方式可以提高套管材料的耐H2S和CO2腐蚀能力。
To make a qualitative investigaion in the corrosion of formation water in Changqing Oilfield on J55 casings, four kinds of J55 casings are selected for a simulation test. The result of the test show that, there exists pitting cormsion on the surfaces of the samples, and the maximum mean corrosion rate is 0. 130mm/a, the minimum is 0.074mm/a. The corrosion product on the sample surfaces is mainly FeS, this means that the casing in this environment suffers CO2 corrosion, bacteria corrosion, H2S corrosion and down-scale corrosion simultaneously. The corrosion rate of the samples has a close relation to the metallurgical microstructure and chemical composition of the samples. Corresponding measures for improving the H2S and CO2 cormsion resistance of the casing maerial are presented.
出处
《石油机械》
北大核心
1998年第7期21-23,共3页
China Petroleum Machinery
关键词
套管
耐蚀性
对比试验
油层水
油田
腐蚀
casing
corrosion resistance
contrast test
formation water
