Corrosion risk associated with microbial souring control using nitrate or nitrite
Corrosion risk associated with microbial souring control using nitrate or nitrite
复制标题
DOI：
10.1007/s00253-005-1897-2
复制
发表时间：
2005-08-01
影响因子：
5
通讯作者：
Voordouw, G
中科院分区：
文献类型：
--
作者：
Hubert, C;Nemati, M;Voordouw, G
酸化是由油藏中的硫酸盐还原菌（SRB）产生的硫化氢，可以通过添加硝酸盐或亚硝酸盐来控制。为了评估这种控制方法对腐蚀的影响，将金属试样安装在上流式填充床生物反应器中，该反应器进料有含有8 mM硫酸盐和25 mM乳酸盐的培养基。在用采出水接种以建立生物源H2S生产之后，用17.5mM硝酸盐或高达20 mM亚硝酸盐处理一些生物反应器，从而消除酸化。未处理生物反应器出口附近的腐蚀速率最高（高达0.4 mm/年（-1））。硝酸盐（17.5 mM）消除硫化物，但在生物反应器的入口附近产生点蚀，而高亚硝酸盐剂量（20 mM）完全消除了微生物活性和相关腐蚀。更渐进的，逐步添加亚硝酸盐高达20 mM导致微生物活性的保留和局部点蚀，特别是在生物反应器入口附近。我们的结论是：（1）通过硝酸盐或亚硝酸盐还原的SRB控制将腐蚀风险从生物反应器出口转移到入口（即从生产井转移到注入威尔斯井），以及（2）从腐蚀预防的观点来看，优选通过连续添加高抑制性亚硝酸盐剂量的酸化处理。
Souring, the production of hydrogen sulfide by sulfate-reducing bacteria (SRB) in oil reservoirs, can be controlled through nitrate or nitrite addition. To assess the effects of this containment approach on corrosion, metal coupons were installed in up-flow packed-bed bioreactors fed with medium containing 8 mM sulfate and 25 mM lactate. Following inoculation with produced water to establish biogenic H2S production, some bioreactors were treated with 17.5 mM nitrate or up to 20 mM nitrite, eliminating souring. Corrosion rates were highest near the outlet of untreated bioreactors (up to 0.4 mm year(-1)). Nitrate (17.5 mM) eliminated sulfide but gave pitting corrosion near the inlet of the bioreactor, whereas a high nitrite dose (20 mM) completely eliminated microbial activity and associated corrosion. More gradual, step-wise addition of nitrite up to 20 mM resulted in the retention of microbial activity and localized pitting corrosion, especially near the bioreactor inlet. We conclude that: (1) SRB control by nitrate or nitrite reduction shifts the corrosion risk from the bioreactor outlet to the inlet (i.e. from production to injection wells) and (2) souring treatment by continuous addition of a high inhibitory nitrite dose is preferable from a corrosion-prevention point of view.