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以某油田回注水为进水,采用两个平行的玻璃反应器历时56 d对比研究了添加纤维素酶对铸铁试样片腐蚀的影响。试验测定了运行过程中水质的变化,并采用X射线衍射仪和扫描电镜分别分析了腐蚀产物并观察了产物形态。最后,还采用室内动态腐蚀速率和缓蚀率表征了纤维素酶的缓蚀性能,并采用极化曲线法和挂片失重法初步探讨了其缓蚀机理。结果表明:油田回注水是一种具有较强腐蚀趋势的介质,回注水中添加纤维素酶在短期内能减缓铸铁试样片的腐蚀,延缓腐蚀产物晶体形态的出现,改变腐蚀产物的类型;纤维素酶的平均缓蚀率为76.09%,其机理主要是在试样片表面形成吸附膜,且基本满足Langmuir吸附等温式。
Taking the injection water of a certain oil field as water, two parallel glass reactors were used to compare the effects of adding cellulase on the corrosion of cast iron samples for 56 days. The changes of water quality during the operation were measured. The corrosion products were analyzed by X-ray diffractometer and scanning electron microscope, and the product morphology was observed. Finally, the indoor corrosion rate and corrosion inhibition rate were also used to characterize the corrosion inhibition of cellulase. The corrosion inhibition mechanism was discussed by polarization curve method and coupon weight loss method. The results showed that the injected water in oil field was a kind of medium with a strong tendency of corrosion. Adding cellulase into the injection water could shorten the corrosion of cast iron sample in a short period of time, delay the appearance of crystal form of corrosion products and change the type of corrosion products. The average inhibition rate of cellulase was 76.09%. The main mechanism of the cellulase was to form adsorption film on the surface of the sample, which basically satisfied the Langmuir adsorption isotherm.