Synthesis and evaluation of poly(N-vinyl caprolactam)-co-tert-butyl acrylate as kinetic hydrate inhibitor  

作　　者：Xing Huang Ran Zhu Liwei Cheng Yijian Zhu Peng Xiao Xiaohui Wang Bei Liu Changyu Sun Weixin Pang Qingping Li Guangjin Chen Xinjing Xu Jinfeng Ji 

机构地区：[1]State Key Laboratory of Natural Gas Hydrates/College of Chemical Engineering and Environment,China University of Petroleum,Beijing 102249,China [2]State Key Laboratory of Natural Gas Hydrate,CNOOC,Beijing 100010,China [3]College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang 641100,China [4]Faculty of Engineering,China University of Geosciences,Wuhan 430074,China [5]Hainan Longpan Oilfield Technology Co.,Ltd,Hainan 571900,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第10期317-325,共9页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(U20B6005);Hainan Province Science and Technology Special Fund(ZDKJ2021026)。

摘　　要：Low dosage kinetic hydrate inhibitors(KHIs)are a kind of alternative chemical additives to high dosage thermodynamic inhibitors for preventing gas hydrate formation in oil&gas production wells and transportation pipelines.In this paper,a new KHI,poly(N-vinyl caprolactam)-co-tert-butyl acrylate(PVCapco-TBA),was successfully synthesized with N-vinyl caprolactam(NVCap)and tert-butyl acrylate.The kinetic inhibition performances of PVCap-co-TBA on the formations of both structureⅠmethane hydrate and structureⅡnatural gas hydrate were investigated by measuring the onset times of hydrate formation under different conditions and compared with commercial KHIs such as PVP,PVCap and inhibex 501.The results indicated that PVCap-co-TBA outperformed these widely applied inhibitors for both structureⅠand structureⅡhydrates.At the same dosage of KHI,the maximum tolerable degree of subcooling under which the onset time of hydrate formation exceeded 24 hours for structureⅠhydrate was much lower than that for structureⅡhydrate.The inhibition strength increased with the increasing dosage of PVCap-co-TBA;The maximum tolerable degree of subcooling for the natural gas hydrate is more than10 K when the dosage was higher than 0.5%(mass)while it achieved 12 K when that dosage rose to0.75%(mass).Additionally,we found polypropylene glycol could be used as synergist at the dosage of 1.0%(mass)or so,under which the kinetic inhibition performance of PVCap-co-TBA could be improved significantly.All evaluation results demonstrated that PVCap-co-TBA was a very promising KHI and a competitive alternative to the existing commercial KHIs.

关 键 词：Hydrate Kinetics Inhibitor Poly(N-vinyl aprolactam)–co-tert-butyl acrylate SYNERGIST SYNTHESIS 

分 类 号：TE31[石油与天然气工程—油气田开发工程]