doi:10.16597/j.cnki.issn.1002-154x.2023.03.004
H2S / CO2 分压下环空保护液腐蚀性评价与表征
刘徐慧∗ 周建伟 潘宝风 陈颖祎 杨东梅 刘 圆
(中国石油化工股份有限公司 西南油气分公司 石油工程技术研究院,四川 德阳 618000)
Evaluation and Characterization of the Corrosion of Annular Protection Fluid under H2 S / CO2 Partial Pressure
Liu Xuhui ∗ Zhou Jianwei Pan Baofeng Chen Yingyi Yang Dongmei Liu Yuan
(Petroleum Engineering Technology Institute of Southwest Oil&gas Branch, SINOPEC, Sichuan Deyang 618000)
摘要:
针对深层含硫气藏环空保护液体系因长期存在于油套管之间对生产管柱产生腐蚀的问题,模拟地层条件开 展了环空保护液对金属材质的腐蚀速率评价实验。 结合微观形貌分析、电化学极化曲线、原子吸收光谱、红外光谱、 拉曼光谱等分析手段对钢片的腐蚀形态、溶液中的铁离子浓度及钢片表面附着物等进行表征。 结果显示,同一分压 下,温度越高,腐蚀越严重;同一温度条件下,H2S 和 CO2分压越高,腐蚀越严重。 钢片表面附着物中大部分为环空保 护液中的有机组分,表明环空保护液对含硫气藏下的油管外壁和套管内壁具有保护作用。
关键词：环空保护液 硫化氢 二氧化碳 腐蚀 微观研究；
Abstract：
To solve the corrosion problem of the production pipe that caused by the long time contacting of the annulus protection fluid system, experiments under simulated formation conditions have been carried out Microscopic morphology analysis, electrochemical polarization curve, atomic absorption spectroscopy, infrared spectroscopy, Raman spectroscopy and other analysis methods were applied to characterize the steel sheet corrosion morphology, the iron ions concentration in the solution, and the attachments on the surface of the steel sheets. The results show that, under the same partial pressure, the higher the temperature was, the more serious the corrosion was caused; under the same temperature, the higher partial pressures of the H2 S and CO2 was, the more serious the corrosion was caused. And most of the attachments on the surface of the steel sheet were the organic components of the annulus protection liquid, which indicating that the annulus protection liquid had a protective effect between the tubing and casing under the sulfur gas reservoir.
Keywords：annulus protective fluid hydrogen sulfide carbon dioxide corrosion microscopic study;