Industrial Water Treatment ›› 2024, Vol. 44 ›› Issue (1): 177-183. doi: 10.19965/j.cnki.iwt.2022-1316

• WATER TREATMENT IN OIL?GAS FIELD • Previous Articles     Next Articles

Synthesis of polyamide chitosan and investigation on inhibiting corrosion of completion fluid

Xiaoxuan GUO1(), Haolong WANG2(), Dalei SHI1, Shukui MA1, Zhongliang ZHANG1, Bangtai XIONG1, Xu LIU1   

  1. 1. China Oilfield Services Co. , Ltd. , Tianjin 300456, China
    2. CenerTech Tianjin Chemical Research & Design Institute Co. , Ltd. , Tianjin 300131, China
  • Received:2023-12-04 Online:2024-01-20 Published:2024-01-24

聚酰胺化壳聚糖的合成及抑制完井液腐蚀研究

郭晓轩1(), 王昊龙2(), 石大磊1, 马树奎1, 张忠亮1, 熊邦泰1, 刘旭1   

  1. 1. 中海油田服务股份有限公司, 天津 300456
    2. 中海油天津化工研究设计院有限公司, 天津 300131

Abstract:

The offshore completion fluid has the characteristics of complex composition and high salinity. In order to solve the severe corrosion of underground pipelines causing by completion fluid. In this paper,a polyamide chitosan(PACS) was synthesized from the natural polysaccharide chitosan,and its corrosion inhibition performance on carbon steel was investigated. The results of weight loss corrosion experiments showed that after adding 2 000 mg/L polyamide chitosan to the completion fluid at 80 ℃,the corrosion rate of carbon steel decreased from 3.852 to 0.072 mm/a,and the corrosion inhibition percentage was 98.13%. In addition,electrochemical tests(potentiodynamic polarization and Nyquist curve) also showed that when the concentration of PACS reached 2 000 mg/L,the corrosion inhibition percentages was more than 90%. PACS shows good corrosion inhibition properties of carbon steel.

Key words: completion fluid, chitosan, polyamide, corrosion inhibitor

摘要:

海上完井液具有成分复杂、矿化度高等特点,针对完井液对井下管道腐蚀严重的问题,以天然多糖壳聚糖(CS)为原料,合成了聚酰胺化壳聚糖(PACS),评估了其抑制碳钢腐蚀的效果。失重腐蚀实验结果表明,在80 ℃下向完井液中投加2 000 mg/L PACS后,碳钢腐蚀速率由3.852 mm/a降至0.072 mm/a,缓蚀率为98.13%。此外,电化学测试(动电位极化和奈奎斯特曲线)结果也表明,当PACS投加量达到2 000 mg/L,缓蚀率为90%以上,PACS具有良好的抑制碳钢腐蚀性能。

关键词: 完井液, 壳聚糖, 聚酰胺化, 缓蚀剂

CLC Number: