杏子川采油厂J55套管腐蚀规律及缓蚀剂防护研究

发布时间：2018-01-06 01:00

本文关键词：杏子川采油厂J55套管腐蚀规律及缓蚀剂防护研究　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

更多相关文章： J55套管 腐蚀原因 腐蚀规律 缓蚀剂

【摘要】：杏子川采油厂长期存在着套管腐蚀的问题。近年来,由于油田的持续开采和注水力度的增大,使得油井产出液综合含水率逐年升高,部分油井超过90%,井下套管腐蚀现象严重,对油田的正常生产和安全造成了巨大威胁。因此,有必要对杏子川采油厂J55套管的腐蚀因素、腐蚀机理和腐蚀规律进行全面的分析和研究,并提出适用现场实际的腐蚀防护措施。针对杏子川采油厂J55套管腐蚀严重的问题,选取了不同区块共13口油井作为研究对象。通过水质分析、腐蚀产物形貌和组成分析后发现CO2和H2S是J55套管腐蚀的主要原因,另外,Cl-、 HCO3-和SRB等对套管腐蚀也有重要影响。因此,对C02、H2S和SRB的腐蚀机理进行了研究,并采用静态失重法和电化学方法研究了温度、Cl-离子浓度、HC03-离子浓度、Ca2+和Mg2+离子浓度、pH和时间对J55钢腐蚀的作用规律,研究发现不同腐蚀影响因素的作用规律都有其各自的特征。结合杏子川采油厂现场实际,选用了油田常用的10种缓蚀剂进行筛选,并对初选剂进行了复配以提高缓蚀效果。实验发现油酸基咪唑啉KLYS-A和咪唑啉季铵盐CRS2-7按体积比3比1复配后,在投加量120ppm时静态失重实验缓蚀率可达90%以上,经成膜性能和电化学测试,复配缓蚀剂都具有良好的缓蚀效果。利用雷诺相似的原理制定了动态实验方案,设计了实验装置,研究了动态条件下温度和流速对复配缓蚀剂缓蚀率的影响。研究发现动态条件下复配缓蚀剂的缓蚀率较低,这与动态时介质对试片表面缓蚀剂保护膜的破坏有关。对现场王214-5井投加复配缓蚀剂后,发现腐蚀速率和铁离子浓度都明显减小,J55套管得到了良好的保护。
[Abstract]:Apricots Sichuan oil extraction plant long-term existence of casing corrosion problems. In recent years, due to the continuous increase oil production and water injection intensity, the oil output liquid water rate increased year by year, more than 90% wells, downhole casing corrosion phenomenon is serious, a huge threat to the safety and normal production of oilfield. Therefore, it is necessary to corrosion the factors of xingzichuan oil production plant of J55 casing, comprehensive analysis and Research on corrosion mechanism and law, and put forward the practical corrosion protection measures for the scene.
The apricots Sichuan oil extraction plant J55 casing corrosion serious problem, select a different block 13 wells as the research object. Through the analysis of water quality, corrosion morphology and composition analysis revealed that CO2 and H2S are the main reasons of casing corrosion in J55, Cl-, HCO3- and SRB on casing corrosion has important effect. Therefore, the C02 corrosion mechanism of H2S and SRB were studied, and the temperature was studied by static weight loss method and electrochemical method, Cl- concentration, HC03- concentration, Ca2+ and Mg2+ concentrations, pH rule and time on the corrosion of J55 steel, the research discovered the law of the effect of different corrosion factors are the features of their own.
Combining with the actual apricots Sichuan oil extraction plant, the oil commonly used 10 kinds of inhibitors were screened, and the primary agent was mixed to improve the inhibition effect. The experimental results showed that oleic acid imidazoline KLYS-A and imidazoline quaternary ammonium salt CRS2-7 according to the volume ratio of 3 to 1 respectively, when the dosage of 120ppm when the static weight loss test corrosion corrosion rate is above 90%, the film-forming properties and electrochemical test, the inhibitor has good corrosion inhibition effect. Using the principle of similar Reynolds developed dynamic experiment scheme, experimental device design, studied under dynamic conditions of temperature and flow rate on the rate of corrosion inhibitor. The study found that dynamic under the condition of the inhibitor the corrosion inhibition rate is low, and the dynamic media on specimen surface corrosion inhibitor film damage. The king of 214-5 wells adding inhibitor, found that the corrosion rate and iron ion concentration are obvious Reduced, the J55 casing has been well protected.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE983

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