CAJ | 학술논문

针对吐哈油田原油储罐底部穿孔泄露影响油田正常生产及安全的问题，开展了腐蚀过程及影响因素分析研究。在原油储罐内进行现场挂片120 d后计算失重腐蚀速率，应用扫描电镜（SEM）分析腐蚀挂片表面的微观形貌，对储罐底部水溶液和储罐钢材进行成分分析，通过电化学方法研究了储罐钢的腐蚀过程，并测试Cl-和Ca2+对钢材的腐蚀速率影响。结果表明，挂片在罐底水溶液中出现不均匀的坑蚀，挂片失重速率为0.22 mm/a，电化学测试腐蚀速率为0.15 mm/a，瞬时腐蚀速率有增加趋势，碳钢表面出现二次钝化溶解现象，在罐底介质中Cl-和Ca2+的增加会加速腐蚀。为原油储罐底板腐蚀泄露的分析及治理奠定了基础。
침대토합유전원유저관저부천공설로영향유전정상생산급안전적문제，개전료부식과정급영향인소분석연구。재원유저관내진행현장괘편120 d후계산실중부식속솔，응용소묘전경（SEM）분석부식괘편표면적미관형모，대저관저부수용액화저관강재진행성분분석，통과전화학방법연구료저관강적부식과정，병측시Cl-화Ca2+대강재적부식속솔영향。결과표명，괘편재관저수용액중출현불균균적갱식，괘편실중속솔위0.22 mm/a，전화학측시부식속솔위0.15 mm/a，순시부식속솔유증가추세，탄강표면출현이차둔화용해현상，재관저개질중Cl-화Ca2+적증가회가속부식。위원유저관저판부식설로적분석급치리전정료기출。
An analysis of process and influening factors in Tuha oilfield was made,aiming to solve the problems in oil produc-tion and safety issues caused by perforation leakage on tank bottom. After exposing coupons in the storage tank for 120 days, corrosion rate of weight loss was calculated. Scanning electron microscope(SEM)was employed to observe the microscopic corrosion morphology of coupons,and the composition of water and steel at the bottom of the storage tank were analyzed. The corrosion process was researched through electrochemical method and the influence of Ca2+and Cl-on corrosion rate was tested. The results show that the irregular pitting corrosion appears on the surface of coupons hung at the bottom of the storage tank. The corrosion rate of weight loss is 0.22 mm/a and the corrosion rate tested by electrochemical method is 0.15 mm/a. The instantaneous corrosion rate presents a trend of gradual increase. Repetitive passivation and solubility of surface film occurs on carbon steel. Ca2+and Cl-will accelerate corrosion in water solution in oil tank bottom. The research lays a foundation for analyzing and solving leakage of tank bottom.