基于产碱-脱硫复合菌的油井腐蚀生物防控技术研究及应用OA

The produced fluids in certain oilfield blocks exhibit prominent issues such as low pH,high sa-linity,elevated CO2 content,and the proliferation of sulfate-reducing bacteria.These factors lead to the severe corrosion of downhole tubulars and surface pipeline networks,causing not only substantial production losses but also significant safety risks and environmental impacts.To address these challenges,biological corrosion inhibi-tors were employed to treat the produced fluids.Through the alkalinization effect of specific bacterial strains,the pH of the produced fluids was gradually and mildly adjusted,thereby mitigating the risk of well scaling.Simultaneously,desulfurizing bacteria were utilized to effectively eliminate sulfide ions from the fluids,achie-ving the comprehensive control of corrosive factors.To verify the practical anti-corrosion efficacy,field trials u-sing these biological inhibitors were conducted on five oil wells suffering from severe corrosion in a specific oil production plant.The results demonstrated that the biological inhibitors significantly reduced the corrosion rate of the produced fluids.Specifically,the corrosion inhibition efficiency across all five wells exceeded 85%,ef-fectively resolving the tubular corrosion issue and extending the workover-free period of the tested wells by over 90%.Ultimately,biological anti-corrosion technology can fundamentally alter the corrosive characteristics of produced fluids and achieve the active protection of equipment and pipelines,providing a novel and environ-mentally friendly approach for corrosion prevention and control in oilfields.