The three types of microorganisms present in oilfield reinjection water pose the most direct threat to oilfield production:
·Sulfate-Reducing Bacteria (SRB): Under anaerobic conditions, SRB metabolize to produce H2S, which directly leads to electrochemical corrosion of equipment and pipelines, causing pitting and ultimately perforation and leaks.
·Saprophytic Bacteria (TGB): They form large amounts of slime and biofilm, which adhere to pipe walls and formation pores, clogging the formation, reducing injection efficiency, and providing a habitat for anaerobic bacteria like SRB.
·Iron Bacteria (IB): They oxidize ferrous iron in water to ferric iron, forming ferric hydroxide precipitates. These precipitates, combined with biofilms, further exacerbate pipeline and formation blockages and deteriorate water quality.
Currently, oilfields widely use ultraviolet disinfection to control these three microorganisms.
Ultraviolet disinfection
In oilfield reinjection water treatment systems, ultraviolet disinfection devices are typically not used as standalone units, but rather integrated at the end of the treatment process. They serve as the final sterilization barrier before water quality refinement and injection.
Process flow: Produced water - oil/impurity removal (coagulation, flotation) → filtration (sand filtration, walnut shell filtration, etc.) → fine filtration (membrane filtration, etc.) → ultraviolet disinfection - injection well
China's petroleum and natural gas industry standard SY/T5329-2012, "Water Quality Indicators and Analysis Methods for Injection Water in Clastic Reservoirs," clearly defines microbial indicators for reinjection water in formations of varying permeability.
· Sulfate-reducing bacteria (SRB): No more than 10 cells/mL
· Saprophytic bacteria (TGB): No more than 100 cells/mL
· Iron bacteria (IB): No more than 100 cells/mL
Innovations in ultraviolet disinfection technology for oilfield reinjection water
Synergistic disinfection mode: "UV + low-dose chemical disinfectant"
As the main sterilization unit, ultraviolet rays are responsible for inactivating more than 99% of microorganisms, quickly and efficiently reducing the bacterial base number to an extremely low level at the outlet of the treatment station.
而后端仅需辅以低浓度(可能是传统用量的10%-20%需要根据管网情况确定)长效的化学抑菌剂供管网中的持续抑制能力,防止微生物复活和二次滋生。
CLEAR中压紫外
ONYX-Clear-SZ管道式中压紫外消毒器,采用中压多谱段紫外灯,不仅实现DNA/RNA的破坏,同时破坏其细胞内的酶及蛋白质,杀菌更为彻底。用于消毒杀菌和降解水中亚硝基二甲胺、1,4-二噁烷、内分泌干扰物(EDCs)、残留农药、蓝藻毒素、GSM(土臭素)和2-MIB(二甲基异茨醇)等有毒微污染物质。
另外,将O3、H2O2等氧化剂与紫外光结合,如UV-O3、UV-H2O2等工艺,可以用于处理污水中CC14、多氨联苯等难降解物质和有机物的氧化去除。
Extrem中压紫外
ONYX-Extrem-GY中压系列产品是一款机身紧凑,但可处理大容量水质的中压紫外线反应器。可应用在对空间有要求,对水质、口感、味道或气味有要求的用水环境。
清洁生产,满足如蛋白纯化、氨基酸分析、生物大分子分析、细胞培养和DNA/RNA提取纯化的用水消毒需求。
适用于:发电厂、冷却循环水、医药、生命科学等应用领域。
ZL大型管道式紫外
ONYX-ZL-SY系列产品采用管道式结构设计,进出口法兰连接,采用强度高耐腐蚀的不锈钢304/316L材质,全密闭和紧凑结构设计。
内外均电解抛光,利用反应器内壁的UV反射,增强UV强度,保证消毒效果。
ONYX-ZL-SY融合了包括自动机械清洗、CFD流态模拟等技术在内的创新技术,以降低成本,大大简化操作和维护。
COG板式臭氧发生器
COG系列臭氧发生器内置ModuOzone®高浓度臭氧放电室及专用高频数字电源控制驱动系统,放电室采用高纯氧化铝陶瓷材料、超微间隙高频放电、高效水冷或风冷散热设计,保证设备输出的臭氧浓度及效率。设备集成免维护高效空压机和高纯度制氧系统,适用于各种应用工况。COG系列臭氧发生器集成压力调节阀、流量计及液晶触摸屏,可以设置臭氧浓度及不同产量的臭氧输出。设备具有结构紧凑、操作简单、方便安装、易于维护等特点,可广泛应用于水处理、除臭、脱色、制药、废水处理、食品加工等领域。
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