胜利油田抗氧缓蚀剂的研制与应用*

Development and Application of An Antioxidant Corrosion Inhibitor in Shengli Oilfield

谭晓林 龙媛媛 刘晶姝 魏 旭 杨为刚

TAN Xiaolin LONG Yuanyuan LIU Jinshu WEI Xu YANG Weigang

针对胜利油田目前尚没有专门针对抑制高含溶解氧污水腐蚀缓蚀剂，导致药剂投加量大而缓蚀效率较差 的现状，综合考虑溶解氧、氧化性物质和HCO3- 的协同腐蚀作用，合成了含有羟基、N-C=S和O=C-N等多吸附中 心的缓蚀剂葡萄糖硫代胺基甲酸盐，并以葡萄糖硫代氨基甲酸盐为主剂，以有机羧酸盐、硫脲和有机膦酸（ATMP）为辅剂，通过正交实验得到配方为60%葡萄糖硫代胺基甲酸盐+6%硫脲+4%羧酸盐+10% ATMP的缓蚀剂 PTT-20。在温度60℃、实验时间72 h下，钢试片在加有30 mg/L复配缓蚀剂PTT-20的污水（氧浓度8.0 mg/L）中 的腐蚀速率为0.0405 mm/a。在溶解氧含量为0.6~1.4 mg/L的现场应用中，30 mg/L缓蚀剂PTT-20的缓蚀率可 达90%以上，缓蚀效果明显好于目前现场常规应用的缓蚀剂。缓蚀剂PTT-20能够形成多点吸附而牢固地吸附在 金属表面，减少氧的吸附；碳硫基和羟基也可以吸收水中的溶解氧，减缓氧腐蚀。复配组分具有协同作用，进一 步提高了缓蚀效率。图3表6参13

At present，there is no specific inhibitor for inhibiting the corrosion of wastewater containing high dissolved oxygen in Shengli oilfield，which results in large amount of reagent and poor corrosion inhibition efficiency. Considering the synergistic corrosion effects of dissolved oxygen，oxidizing substances and HCO3- ，a highly effective inhibitor，glucose thiocarbamate， containing multiple adsorption centers such as hydroxyl， N—C=S and O=C—N， was synthesized， and using glucose thiocarbamate as the main agent，organic carboxylate，thiourea and organic phosphonic acid（ATMP）as adjuvant，through orthogonal experiment，the formula of the compound inhibitor PTT-20 was obtained as follows，60% glucose thiocarbamate + 6% thiourea + 4% carboxylate + 10% ATMP. The corrosion rate of the steel test pieces in the sewage（oxygen concentration 8.0 mg/L） with 30 mg/L PTT-20 was 0.0405 mm/a at the temperature of 60℃ and the experiment time of 72 h. In the field application where the dissolved oxygen content was 0.6—1.4 mg/L，the corrosion inhibition rate of 30 mg/L PTT-20 could reach more than 90%，and the corrosion inhibition effect was significantly better than that of the current conventional corrosion inhibitors. PTT-20 could form multi-point adsorption and firmly adsorb on the metal surface，reducing oxygen adsorption. Carbon-sulfur groups and hydroxyl groups could also absorb dissolved oxygen in water and slow down oxygen corrosion. The compound components had a synergistic effect and further improve the corrosion inhibition efficiency.

10.19346/j.cnki.1000-4092.2020.03.022