ZY采油三厂明六号站管线微生物腐蚀研究

发布时间：2018-03-03 04:12

本文选题：硫酸盐还原菌　切入点：腐蚀　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：现在我国很多油田处于开采阶段的中后期,加上多次注水回采和注水驱油技术的应用,导致石油含水量达80%以上,水中所含高浓度离子和微生物能造成管线腐蚀、穿孔、阻塞,给油田工业带来巨大经济损失和安全隐患,研究防治管线腐蚀问题具有重要现实意义。以ZY油田采油三厂明六号站油田采出水为主要研究对象,测量了采出水具体组成情况,采用HPLC法、铬酸钡分光光度法、原子吸收分光光度计法、绝迹稀释法测量溶液中主要阴阳离子浓度和细菌数量,同时得到了管线单井含水情况、油田采出水其它理化特性和SRB的生长特性曲线。结果如下:测得Cl-浓度为39.787g/L,SO42-浓度为130mg/L,Na+浓度为 23.029g/L,硫酸盐还原菌(Sulfate-reducing Bacteria,SRB)细菌含量为700个/mL,腐生菌7×106个/mL,铁细菌1.1×109个/mL,SRB生长经历了对数期(0d到4d),稳定期(4d到10d)和衰亡期(10d到16d)三个阶段。为探究造成管线腐蚀的主要原因,通过SEM、XRD对空白组、灭菌组、SRB组实验腐蚀产物进行定性分析,结果表明SRB参与了碳钢的腐蚀过程。通过静态腐蚀实验测试了三组实验的Q235碳钢腐蚀失重曲线与平均腐蚀速率曲线,通过Tafel极化曲线和交流阻抗谱技术,对三组实验腐蚀结果进行定量分析,结果表明在明六号站采出水环境中,SRB是造成碳钢腐蚀穿孔的主要原因。针对SRB对油田管线腐蚀的普遍存在性和严重危害性,开发研究了一种经济、环保、高效的微生物防治方法。主要利用油田中常见的三种芽孢杆菌(蜡状芽孢杆菌BC,沙福芽孢杆菌BM,枯草芽孢杆菌BS)与SRB的生物竞争关系,达到对SRB的防治。将BC、BM、BS分别与SRB的混合培养,通过Tafel极化曲线、交流阻抗谱技术、SEM和EDS对比研究了碳钢腐蚀的腐蚀程度,结果表明三种细菌对SRB均有一定的防治作用,防治效果优劣顺序为:BMBCBS。沙福芽孢杆菌以其易培养、效果好、经济环保的优点,在油田防腐蚀领域将有很大发展前景。
[Abstract]:At present, many oilfields in China are in the middle and late stage of exploitation, and the application of multiple water injection recovery and waterflooding technologies has resulted in oil water content reaching more than 80%. The high concentration of ions and microorganisms in the water can cause pipeline corrosion, perforation and blockage. It is of great practical significance to study the prevention and cure of pipeline corrosion. Taking the produced water of Ming-6 Station of No. 3 Oil recovery Plant of ZY Oilfield as the main research object, the concrete composition of the produced water is measured. HPLC method, barium chromate spectrophotometry, atomic absorption spectrophotometer and extinction dilution method were used to measure the concentration of the main anions and bacteria in the solution, and the water content in the single well of the pipeline was obtained. The results are as follows: the concentration of Cl- is 39.787g / L / L so _ 42- concentration is 130mg / L, the concentration of sulfate-reducing bacteria is 23.029g / L, the bacteria content of Sulfate-reducing Bacteriae is 700 / mL, the number of decomposed bacteria is 7 脳 106 mL / L, the iron bacteria is 1.1 脳 109 mLSRB. The growth has gone through three stages: logarithmic period (0 d to 4 d), stable phase (4 d to 10 d) and decay period (10 d to 16 d). The corrosion products of blank group and sterilized group were qualitatively analyzed by SRB. The results showed that SRB was involved in the corrosion process of carbon steel. The corrosion weight loss curve and average corrosion rate curve of Q235 carbon steel were measured by static corrosion experiment. By means of Tafel polarization curve and AC impedance spectroscopy, the corrosion results of three groups of experiments were quantitatively analyzed. The results show that SRB is the main cause of corrosion and perforation of carbon steel in the environment of producing water in Ming No.6 Station. In view of the widespread existence and serious harm of SRB to pipeline corrosion in oil field, a kind of economic and environmental protection is developed and studied. The biocompetitive relationship between Bacillus cereus, Bacillus cereus, Bacillus subtilis, Bacillus subtilis and SRB was used. The corrosion degree of carbon steel was studied by means of Tafel polarization curve, AC impedance spectroscopy and EDS. The results showed that the three kinds of bacteria could prevent and cure SRB to some extent. The control effect is in the order of: BMBCBS.The Bacillus salvericus has the advantages of easy cultivation, good effect, economic and environmental protection, and will have a great development prospect in the field of oil field corrosion prevention.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE983

【相似文献】