油房庄联合站注水管线腐蚀因素分析研究

发布时间：2019-04-19 00:38

【摘要】：延长油田位于水资源严重匮乏的陕西北部,且油层渗透率比较低。伴随着原油的采出,地层水和注入水也一起上升到地面,油水分离后形成了大量采油污水。采油污水对管线及处理设施有严重的腐蚀性,会导致穿孔、破漏等损坏,每年产生巨额的经济损失,影响到整个油田的生产效益。油房庄联合站日产污水700吨,水质最大的特点是含硫高,一般在250mg/L左右。另外,矿化度平均为37000mg/L,氯离子20000mg/L以上,硫酸盐还原菌103—104个/mL,腐生菌104—105个/mL,铁细菌103—105个/mL,pH值5.5—7.0,平均腐蚀速率0.202mm/a,目前未采取防腐措施。本文采用SY/T 5523—2000标准在现场分析了油房庄联合站油田采出水系统的水质特点,应用动、静态分析法,分析了回注水系统的腐蚀因素,通过注水药剂筛选解决目前的腐蚀结垢问题。研究表明筛选和优化阻垢剂经室内实验分析,复合阻垢剂加量为50mg/L时阻垢率最大,能达到98.4%。新型含膦缓蚀剂具有良好的缓蚀性能。双季胺盐+戊二醛(10:1)进行油田采出水处理后,SRB杀菌率达到97%以上、TGB杀菌率达到85%以上,对于油房庄采出水、回注水有较好的杀菌效果,加药处理后管线腐蚀结垢得到明显的改善。
[Abstract]:Yanchang oilfield is located in the north of Shaanxi, where water resources are seriously deficient, and the permeability of the reservoir is relatively low. With the recovery of crude oil, formation water and injected water also rise to the ground, and a large amount of oil wastewater is formed after oil-water separation. The oil production sewage has serious corrosiveness to the pipeline and the treatment facility, will cause the damage such as the perforation, the leakage and so on, produce the huge economic loss every year, and affect the production benefit of the whole oil field. Youfangzhuang combined station produces 700 tons of sewage per day, the biggest characteristic of water quality is high sulfur content, generally in 250mg/L. In addition, the average salinity was 37000mg / L, the chloride ion 20000mg/L was more than 103,104 / mL, saprophytic bacteria / mL, 103x105 / mL, pH 5.5 渭 7.0, the average corrosion rate was 0.20mm / a, the average corrosion rate was 0.20mm / mol, the average salinity was 37000mg / L. At present, no anticorrosion measures have been taken. In this paper, the water quality characteristics of the produced water system in Youfangzhuang joint station oil field are analyzed by using SY/T 5523 / 2000 standard, and the corrosion factors of the reinjection system are analyzed by using the dynamic and static analysis method. The problem of corrosion and scaling is solved through the selection of water injection agents. The results show that the scale inhibition rate is the highest when the amount of 50mg/L is 50mg/L, and the scale inhibition rate can reach 98.4%. The new phosphine-containing corrosion inhibitor has good corrosion inhibition performance. After treatment of oilfield produced water with bisquaternary glutaraldehyde (10:1), the bactericidal rate of SRB and TGB reached above 97% and 85%, respectively. For the produced water from Youfangzhuang, the bactericidal effect of reinjection was better. The corrosion and scaling of pipeline was improved obviously after adding medicine.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE983

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