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- Title
The development of high-performance kinetic hydrate inhibitors by introducing N-vinyl caprolactam and vinyl ether homopolymers into PVCap.
- Authors
Xing Huang; Yi-Jian Zhu; Xiao-Hui Wang; Ran Zhu; Peng Xiao; Wei-Xin Pang; Chang-Yu Sun; Guang-Jin Chen
- Abstract
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.
- Subjects
VINYL ethers; INTERFACIAL tension; PIPELINE transportation; GAS wells; GAS hydrates; METHANE hydrates
- Publication
Petroleum Science (KeAi Communications Co.), 2024, Vol 21, Issue 6, p4454
- ISSN
1672-5107
- Publication type
Academic Journal
- DOI
10.1016/j.petsci.2024.09.001