The development of high-performance kinetic hydrate inhibitors by introducing N-vinyl caprolactam and vinyl ether homopolymers into PVCap  

作　　者：Xing Huang Yi-Jian Zhu Xiao-Hui Wang Ran Zhu Peng Xiao Wei-Xin Pang Chang-Yu Sun Guang-Jin Chen 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,China [2]State Key Laboratory of Natural Gas Hydrates,CNOOC,Beijing,100010,China

出　　处：《Petroleum Science》2024年第6期4454-4463,共10页石油科学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.22127812,22278433,U20B6005,22178379);Hainan Province Science and Technology Special Fund(Grant NO.ZDKJ2021026)。

摘　　要：Low dosage kinetic hydrate inhibitors(KHIs)are a kind of alternative chemical additives to prevent gas hydrate formation in oil&gas production wells and transportation pipelines.In this work,a series of KHIs were experimentally synthesized with N-vinyl caprolactam(N-VCap)and vinyl ether including vinyl ether,vinyl n-butyl ether,vinyl isobutyl ether,triethylene glycol divinyl ether,with the mole ratio ranging from 9:1 to 5:5.The inhibition performance of new-synthesized KHIs on the formation process of methane hydrate were examined and compared with that of commercial N-vinyl caprolactam PVCap.Several ethylenediamine reagents were used as synergists and tested to improve the inhibition capacity of new-synthesized KHIs.The experimental results demonstrate that the introduction of ether groups on PVCap improves the performance of hydrate inhibitors.PVCap-VNBE(N-VCap:vinyl n-butyl ether=5:5)shows the best inhibition performance for methane hydrate,which could extend the TVO to 1251 min under 6 K subcooling.N,N'-dimethylethylenediamine shows the best synergistic effect for PVCap-VNBE(5:5),and extends the TVO by 2.75 times at 7 K subcooling.Additionally,the relationship between hydrate inhibition performance and interfacial tension of newly-synthesized KHIs under high pressure were studied.It shows that the lower interfacial tension of KHIs would result in longer onset time,exhibiting better inhibition performance.

关 键 词：HYDRATE Flow assurance Kinetic hydrate inhibitor Synergist effect Interfacial tension 

分 类 号：TE39[石油与天然气工程—油气田开发工程] TE832