The Influence of Inhibitors on Methane Hydrate Formation

doi:10.12422/j.issn.1006-396X.2023.03.006

Abstract

Abstract:

Natural gas hydrates have vast reserves and are considered a new clean energy source for replacing traditional fossil fuels such as coal and oil in the future.The formation, inhibition and decomposition of natural gas hydrate are affected by many factors.When studying the inhibition and acceleration effect of chemical agents on hydrate decomposition,multiple factors should be considered, such as fresh water or sea water, different gas?liquid ratios in the reactor, and pressure. In this paper, hydrate?related simulation experiments were carried out through a self?designed visualization simulation device for hydrate formation,inhibition and decomposition in wellbore. Under a gas?liquid ratio of (150 $∶$ 350),the combined effects of a laboratory?prepared KHI3 inhibitor and different concentrations of NaCl were analyzed to determine the optimal concentration combination. The experiment found that under the compound scheme of 3%NaCl+1%KHI3, hydrate is not easy to generate, but when the concentration of KHI3 is 2%, the nucleation rate of hydrate increases instead,which promotes the generation of hydrate.In practical applications,the concentration of the inhibitor should be strictly controlled to avoid pipeline blockage caused by massive hydrate formation.

Key words: Gas hydrate, Analog device, Kinetic inhibitor, Hydrate formation, Hydrate inhibition

摘要：

天然气水合物储量巨大，是未来替代煤和石油等传统化石能源的新型清洁能源之一。天然气水合物生成、抑制与分解受多种因素的影响，在研究化学抑制剂对水合物分解抑制与加速效果时需要考虑多重因素的影响，如纯水或海水、反应釜内不同气液比、压力等。利用自行研制的可视化水合物生成、抑制和分解模拟装置进行了水合物相关模拟实验研究。在气液体积比为150 $∶$ 350时，采用实验室自配的动力学抑制剂KHI3和不同质量分数的NaCl进行复配分析，选出最佳复配方案。结果表明，在3%NaCl+1%KHI3（质量分数）复配方案下，水合物不易生成；KHI3质量分数为2%时，水合物成核速率反而增快，对水合物生成起到促进作用。在实际应用中，应该严格控制抑制剂质量分数，避免出现水合物大量生成而导致的管道堵塞。

关键词: 天然气水合物, 模拟装置, 动力学抑制剂, 水合物生成, 水合物抑制

CLC Number:

TQ031.2

Yunyan Tie, Jie Wang, Houshun Jiang, Longfei Fan, Jiayue Gan, Panyang Guo. The Influence of Inhibitors on Methane Hydrate Formation[J]. Journal of Petrochemical Universities, 2023, 36(3): 37-43.

铁云艳, 汪杰, 江厚顺, 范龙飞, 敢家悦, 郭盼阳. 抑制剂对甲烷水合物生成规律影响的研究[J]. 石油化工高等学校学报, 2023, 36(3): 37-43.

Figures/Tables 7

Fig.1 Experimental simulation device for methane conversion kinetics in deep seawater environment

Table 1 Compound scheme of chemical inhibitor

试剂	生成点压力/MPa	温度/℃
纯水	15.0	3.0
纯水+2%KHI3	15.0	3.0
纯水+1%KHI3	15.0	3.0
10%NaCl	15.0	3.0
10%NaCl+2%KHI3	15.0	3.0
10%NaCl+1%KHI3	15.0	3.0
3%NaCl	15.0	3.0
3%NaCl+2%KHI3	15.0	3.0
3%NaCl+1%KHI3	15.0	3.0

Fig.2 Pressure stage change rate,pressure and methane consumption of different mass fraction inhibitors in pure water system

Fig.3 Pressure stage change rate,pressure and methane consumption of different mass fraction inhibitors in 10% NaCl system

Fig.4 Pressure stage change rate,pressure and methane consumption of different mass fraction inhibitors in 3% NaCl system

Fig.5 The pressure and methane consumption of the same mass fraction in different systems

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