钢管2024，Vol.53Issue(4)：22-27,6.DOI:10.19938/j.steelpipe.1001-2311.2024.4.22.27
P110S油管在无固相压井液中点蚀成因分析
Analysis of Pitting Corrosion Causes for P110S Tubing in Solid-free Well-killing Fluid
高展 1刘传森1
作者信息
- 1. 宝山钢铁股份有限公司,上海 201900
- 折叠
摘要
Abstract
An analysis is conducted on the causes for the pitting corrosion of the P110S tubing in the environment of solid-free well killing fluid.The alloy composition and microstructure of the tubing are confirmed normal via relevant testing.Owing to analyzing the chemical properties and the corrosion products of the tubing as identified before and after the injection of the well-killing fluid,it is determined that some acidic substances are mixed with the well killing-fluid as being injected into the well,and there exists in the corrosion products FeCO3,a product with CO2 corrosion characteristics.Finally thanks to the hi-temperature,hi-pressure corrosion simulation test to reproduce the tubing pitting corrosion pheno-menon,it is revealed that the above mentioned pitting corrosion of the P110S tubing is caused by the CO2 as dissolved in the well-killing liquid.Accordingly it is suggested that when selecting proper tubing as working string for a well which op-eration conditions are not so clear,tubular goods with higher corrosion resistance according to the in-well working conditions as identified before should be used so as to increase the corrosion redundancy of the string for avoiding any potential safety hazard and economic loss as caused by the failure of corroded string.关键词
油管/P110S/点蚀/CO2腐蚀/无固相压井液Key words
tubing/P110S/pitting corrosion/CO2 corrosion/solid-free well-killing fluid引用本文复制引用
高展,刘传森..P110S油管在无固相压井液中点蚀成因分析[J].钢管,2024,53(4):22-27,6.
