生态因子对油田注水系统中硫酸盐还原菌生长的影响

The effect of ecological factor on sulfate-reducing bactera of oilfield water-flooding system

针对油田注水系统中硫酸盐还原菌(SRB)的繁殖滋生对采油设施造成的腐蚀问题,探讨了pH值、温度、聚丙烯酰胺(HPAM)质量浓度、矿化度对SRB优势菌生长的影响.结果表明:C1-5是油田地面水系统的优势菌,该菌最佳生长条件是pH值为8,温度为40℃,HPAM质量浓度为500mg.L-1,矿化度为9000mg.L-1;对SRB菌生长的影响,pH值是主要影响因子,其次是温度和HPAM质量浓度,矿化度的影响不大.当pH值小于7或大于9,温度小于20℃或大于50℃,HPAM质量浓度大于1000mg.L-1时,可有效抑制SRB菌的生长.

Aiming at the corrosion problem of oil extraction equipments caused by sulfate-reducing bacteria(SRB) reproducing in oil field surface system,the paper has discussed the effects on growth of preponderant SRB in different temperature,pH,mineralization degree as well as concentration of polymers.The results indicate that C1-5 is the preponderant strains of the system.It's optimum growth condition is 40 ℃,pH8.0,mineralization degree 9 000 and the concentration scope of polyacrylamide 500.pH is the main effective factor of the four factors.The effects of temperature and the concentrations of polyacrylamide are in the second place and the effect of mineralization degree is relatively small.Changing pH is the most efficient method to control SRB.Regulate pH under seven or above 9,turning the temperature under twenty degree or above fifty degree and making concentration scope of polyacrylamide above 1 000 mg·L-1 can control SRB efficiently.