摘要:
深海油田开采过程由于存在低温高压条件,管道中会因形成水合物而造成堵塞。设计并合成了新型水合抑制剂聚N-甲氧基-N-甲基丙烯酰胺(polyMEHAMs),以实现延缓水合物形成的目的。结果表明,polyMEHAMs在相对分子质量达到2.51×106(polyMEHAMs-6)时,具有明显的抑制水合物效果,其在去离子水中的浊点为63 ℃;在烷烃水体积比为1∶4、polyMEHAMs-6抑制剂投加量为2 500 mg/L、初始压力为4.0 MPa条件下,过冷度为10.8 ℃和12.3 ℃时polyMEHAMs-6抑制水合物的诱导时间分别为10.7 h和13.7 h,其在过冷度12.3 ℃下对水合物的抑制性能优于10.8 ℃。机理探索实验表明,疏水性—OCH3基团与酰胺O C—NHCH3基团形成的O C—NCH3—OCH3结构具有延缓水合物形成的能力。
关键词:
天然气水合物,
水合物抑制剂,
丙烯酰胺聚合物
Abstract:
In the process of deep-sea oil field exploitation,due to the existence of low-temperature and high-pressure conditions,hydrates can form in the pipeline,causing blockage. A new type of hydration inhibitor poly(N-methoxy-N-methylacrylamide)(polyMEHAMs) was designed and synthesized to delay the formation of hydrates. The results showed that when the polyMEHAMs had a relative molecular weight of 2.51×106(polyMEHAMs-6),it had a significant inhibitory effect on hydrates,with a cloud point of 63 ℃ in deionized water. Under the conditions of alkane and water volume ratio of 1∶4,polyMEHAMs-6 inhibitor dosage of 2 500 mg/L and initial pressure of 4.0 MPa,the induction time of polyMEHAMs-6 inhibiting hydrates at subcooling of 10.8 ℃ and 12.3 ℃ were 10.7 hours and 13.7 hours,and the inhibition performance of inhibitors at subcooling of 12.3 ℃ was better than that at subcooling of 10.8 ℃. The mechanism exploration experiment showed that the hydrophobic —OCH3 group and the amide O C—NHCH3 group formed O C—NCH3—OCH3 structure,which had the ability to delay hydrates formation.
Key words:
natural gas hydrate,
hydrate inhibitor,
acrylamide polymer
中图分类号:
史言康, 李志元, 刘丽强, 滕厚开, 徐慧, 王素芳, 赵清顺, 韩恩山. 水合物抑制剂聚N-甲氧基-N-甲基丙烯酰胺的研究[J]. 工业水处理, 2023, 43(10): 157-162.
Yankang SHI, Zhiyuan LI, Liqiang LIU, Houkai TENG, Hui XU, Sufang WANG, Qingshun ZHAO, Enshan HAN. Study on poly-N-methoxy-N-methylacrylamide as hydrate inhibitor[J]. Industrial Water Treatment, 2023, 43(10): 157-162.