在研究延长油矿注空气低温耗氧机理的过程中发现,地层水中的亚铁离子在低温下易被空气中的氧氧化.为了考察亚铁离子耗氧规律,采用邻菲罗啉分光光度法测得甘谷驿地层水中亚铁离子浓度随时间的变化关系,并用简化的动力学方程对实验数据进行模拟.结果表明,当亚铁离子在甘谷驿地层水中的浓度范围为32.04～129.08 mg/L时,动力学数据更符合一级反应的规律,静置条件下,一级反应级数对应的反应速率常数为0.052 3～0.114 1 h-1,通入充足空气条件下,一级反应级数对应的反应速率常数为0.227 7 ～0.513 0 h-1.%Ferric iron in formation water is easily oxidized by oxygen in the air,which is found in the research of oxygen consumption mechanism at low temperature for air injection of Yanchang oilfield. For knowing the law of ferrous oxygen consumption, 1 ,10-phenanthroline photometric method is adopted to get the concentration variation of ferric iron in Ganguyi formation water with time. Then experimental data is simulated by simple kinetics equation. The results show that kinetics date is more in line with the law of the first-order reaction while the ferrous concentration is between 32. 04 ~ 129. 08 mg/L in Ganguyi formation water. The first-order reaction rate constant is between 0.052 3 ~0. 114 1 h~' under the condition of standing, whereas it is 0.227 7 -0.513 0 h"1 in condition of feeding enough air.
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