硫酸盐还原菌对水解聚丙烯酰胺黏度的影响

Influence of Sulfate-reducing Bacteria on the Viscosity of Polyacrylamide

目的:研究硫酸盐还原菌对油田驱油用水解聚丙烯酰胺体系黏度的影响。方法:以油田回注水配制不同分子量的HPAM溶液,考察硫酸盐还原菌在不同分子量聚合物中的生长繁殖情况及对HPAM溶液黏度的影响。结果:中分、高分、超高分HPAM-采出水体系初始黏度为21.7、25.4、38.9mPa·s,低于灭菌处理的23.0、27.8、45.8mPa·s。上述体系黏度在24h内明显下降。SRB的数量也由初始的3.0×103cfu/mL降低至10～102cfu/ml。结论:短期内SRB对高浓度的HPAM降解作用有限。SRB培养物中的Fe2+是造成HPAM黏度下降的主要原因。SRB对HPAM黏度的影响是间接的。

Objective：To investigate the potential effects of sulfate-reducing bacteria （SRB） on the viscosity of hydrolyzed polyacrylamide dissolved in oilfield injection water. Method： Monitoring the variations of viscosity of injection water-HPAM mixture as well as the growth of SRB therein. Result： The original viscosity of medium-size, high-molecular and super high-molecular HPAM was 21.7, 25.4, 38.9 mPa·s, respectively, lower than those in control （23.0、27.8、45.8 mPa·s）. The number of SRB was decreased from 3.0×10^3 cfu/mL to 10～10^2cfu/ml. Conclusion： The SRB exhibited limited destructing effect on HPAM in short term. The Fe2＋ derived from the activity of SRB might be responsible for the decrease of the viscosity of HPAM mixture. Hence, the SRB should have an indirect effect on the viscosity of HPAM used.