西江油田水溶性缓蚀剂HYH-612性能评价

Water Soluble Corrosion Inhibitor HYH-612 for Use in Xijiang Offshore Oilfield

西江海上油田使用油溶性缓蚀剂引起外排污水含油量增大,因此研发了水溶性的咪唑啉衍生物缓蚀剂HYH-612。在体积比90∶10的模拟产出水和原油混合而成并饱和CO2气的腐蚀介质中,在95℃下静态和动态测试中,HYH-612的缓蚀性能相当于在用缓蚀剂。极化曲线表明HYH-612可抑制20号碳钢腐蚀反应的阳极和阴极过程,极化电阻测试表明加量10和20mg/L的HYH-612在碳钢表面形成的致密保护膜随时间变薄,48小时未破坏。HYH-612无乳化倾向,起泡性极小,对在用破乳剂、阻垢剂性能无影响,在用阻垢剂对HYH-612性能的影响轻微。第三方评价结果表明,加量10mg/L的HYH-612使93℃、动态腐蚀速率由平均28.78mm/a降至2.63mm/a,缓蚀率为90.8%。在西江油田现场试验中,加量10mg/L的HYH-612使生产水的腐蚀速率降低48.6%,控制在0.12mm/a以下,外排污水水质符合要求。

At Xijiang offshore oil field,using oil soluble corrosion inhibitor led to increased oil content in the discharge produced water and to replace this chemical,a water soluble imidazoline derivative was developed as corrosion inhibitor HYH-612. In inhibiting capability HYH-612 was similar to the inhibitor in use as shown in static and dynamic tests at 95℃ in CO2 gas saturated simulation prduced water/crude oil mixture in volume ratio 9：1. The polarization curves demonstrated HYH-612 abating simultaneously the anodic and cathodic processes of ^#20 carbon steel. The polarization resistance showed that HYH-612 added at dosage 10 and 20 mg/L formed on steel surfaces dense film,which became thinner with time and did not destroy in 48 hrs. HYH-612 possessed no emulsifying ability and very weak foaming ability,exerted no negative influence on the demulsifier and the scale inhibitor in use and was affected little by the scale inhibitor in use. The laboratory appraisal made by the third party showed that the dynamic corrosion rate lowered down from 28.78 mm/a in average to 2.63 mm/a,or a percentage inhibition of 90.8% was observed,with HYH-612 added at dosage 10 mg/L. In a field trial conducted at Xijiang offshore oil field HYH-612 at dosage 10 mg/L was used in the produced water,the corrosion rate lowered by 48.6% and was kept less than 0.12 mm/a and the discharge produced water was acceptable and qualified.