反硝化抑制微生物驱过程中生物腐蚀研究

Research of the Denitrification Inhibition Reducing Microbiology Corrosion during Microbial Flooding

任付平 吴 刚 游 靖 裴亚托 陈京生 郑 雅

REN Fu-Ping WU Gang YOU Jing PEI Ya-Tuo Chen Jing-Sheng Zheng Ya

通过对宝力格油田微生物驱产出液跟踪监测，硫酸盐还原菌浓度在微生物驱期间增加两个数量级，为了抑制微生物驱期间硫酸盐还原菌的生长繁殖，开展了反硝化抑制硫酸盐还原菌技术研究。室内实验结果表明：不同浓度营养剂均能促进生物腐蚀发生，低浓度营养剂对硫酸盐还原菌激活效果明显；在产出液中添加0.25%硝酸盐，反硝化菌 由1.4×103个/ml增至6.5×105个/ml，硫酸盐还原菌的菌数由1.5×104个/mL降至1.0×101个/mL，在添加营养剂的基础上添加0.25%硝酸盐能降低由添加营养剂造成的生物腐蚀，腐蚀速率降低21.41%。

It was found that the sulfate reducing bacterium (SRB) increased by two order of magintitude and the nitrate reducing bacteria (NRB ) change little by examining the produced water of the Baolige oilfield. In order to restrain the growth of them SRB, the denitrification inhibition technology was probed. The experiment results indicated that the additive nutrient substance in different concentrations could produce microbiologically influenced corrosion, and the nutrient substance with low concentration could promote SRB. The addition of 0.25% nitrate into the production water made the number of bacterial (NB) of NRB increased from 1.4×103 to 6.5×105 units per milliliter , and the NB of SRB decreased from1.5×104 to1.0×101 units per milliliter. At last, the corrosion of N20 steel in the production water containing nutrient substances decreased by 21.41% by adding 0.25% nitrate. As a result, the denitrification inhibition could restrain the growth of SRB effectively.