Natural gas under high pressure and low temperature environment with free water is very likely to generate gas hydrate in downhole and surface pipelines,causing wellbore plugging and other safety issues.Injecting kinetic inhibitors is the most environmentally friendly and efficient method at present,but in the environment of high undercooling,the inhibition performance is weak,so it is necessary to develop new kinetic inhibitors with high undercooling resistance.In the experiment,N-vinylpyrrolidone(NVP)was used as the main monomer,and UpMA monomer with multiple hydrogen bond structure was used as the functional monomer.The two copolymerized to prepare a new kinetic hydrate inhibitor PVP-UpMA.At the same time,the temperature and pressure torque was used.The inhibitory nucleation and growth inhibitory properties of hydrate inhibitors were comprehensively evaluated by the method,and the inhibitory properties of the inhibitor in the hydrate formation prcess were evaluated by examining parameters such as durability undercooling,induction time and gas consumption.The results showed that the durable undercooling degree of PVP-UpMA increased slightly with the increase of concentration,and the durable undercooling degree(6.45 ℃)of 1％PVP-UpMA was significantly better than that of commercial PVPk90(4.11 ℃)and EG(3.36 ℃);the inhibition performance of 1％PVP-UpMA decreased with the increase of subcooling degree,but the induction time still exceeded 200 min at high subcooling degree(7.5 ℃),and the gas consumption decreased by more than 75％compared with pure water;The optimal concentration of PVP-UpMA should be lower than 1.5％at 7.5 ℃ supercooling.The environmental benefits of PVP-UpMA are average,but the economic benefits are good,and it is expected to replace traditional thermodynamic inhibitors on site.
gas hydratenovel kinetic inhibitorsevaluation of inhibition performancetemperature-pressure torque method
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