CO_2驱油产出水对J55钢油管腐蚀行为的影响及水质分析

Effect of Water Produced with Carbon Dioxide Flooding on Corrosion Behavior of Low Carbon Steel Oil Pipe and Anal-ysis of Quality of the Water

为了弄清CO2驱油产出水在不同CO2分压下对J55钢管材的腐蚀及水质的变化,利用高压反应釜模拟CO2驱油环境,对不同CO2分压下J55钢在驱油产出水中的腐蚀行为和咪唑啉及改性后的缓蚀剂不同浓度时的缓蚀性能进行了研究,计算了其腐蚀速率及缓蚀效率,分析了腐蚀产物膜的表面形貌,测试了产出水悬浮物含量、总Fe含量及HCO-3浓度。结果表明:J55钢油管的腐蚀速率随CO2分压增大而增大;咪唑啉缓蚀剂对J55钢的缓蚀效率随其浓度的增大而提高,改性咪唑啉的缓蚀效果更佳;悬浮物含量、总Fe含量及HCO-3浓度随缓蚀剂浓度的增大而不断降低。

The effect of water produced along with CO2 flooding on the corrosion behavior of low carbon steel( J55 steel) oil pipe was investigated under different CO2 partial pressures while a high-pressure autoclave was performed to simulate CO2 flooding environment. The inhibition efficiencies of two kinds of imidazoline inhibitors with different concentrations were investigated; and relevant corrosion rates and inhibition efficiencies were calculated. Moreover,the surface morphology of the corroded product coating was analyzed,and the quality of the produced water was analyzed based on measurements of content of suspended solid,content of total Fe,and concentration of HCO-3. Results indicated that the corrosion rate of J55 steel rose with increasing CO2 partial pressure. In the meantime,the inhibition efficiency of the imidazoline inhibitors rose with the increase of concentration,and modified imidazoline inhibitor had better inhibition performance. Moreover,the content of suspended solid,content of total Fe,and concentration of HCO-3 of the produced water tended to continuously decline with increasing concentration of the inhibitors.