In the process of exploiting natural gas hydrate,temperature and pressure changed can lead to secondary formation of gas hydrate after decomposition,resulting in wellbore and pipeline blockage.Due to the strong hydrophilicity and biodegradability,glycine has great application potential in hydrate prevention and control.However,its synergistic inhibition mechanism to hydrate formation when combining it is combined with thermodynamic inhibitors has not been understood clearly.In this paper,the formation of methane hydrate under the action of the combination of glycine with common salt and alcohol thermodynamic inhibitors is experimentally simulated,the synergistic inhibition mechanism of glycine and thermodynamic inhibitors to the formation of methane hydrate is analyzed,and the glycine drilling fluid system suitable for marine hydrate exploration and development is formed.And the following research results are obtained.First,methane gas consumption cannot truly reflect the inhibition effect of inhibitors on hydrate formation,and it needs to be combined with the an ultimate amount of hydrate formation and the a time change of three hydrate formation stags to give a comprehensive judgement.Second,when the concentration of glycine is 1.0％,the inhibition effect on hydrate formation is the best,and the corresponding reaction system has the smallest hydrate formation zone and the largest stable zone.Third,compared with 1.0％glycine,the combination of 5.0％salt inhibitor and 1.0％glycine has a synergistic inhibition effect on hydrate formation,and can reduce the hydrate formation by 20％to 30％.However,the combination of 5.0％alcohol inhibitors with 1.0％and 0.5％glycine promotes hydrate formation instead.Fourth,the drilling fluid system composed of glycine and salts can effectively reduce hydrate formation.In conclusion,the research results further clarify the synergistic inhibition mechanism of glycine and thermodynamic inhibitor to the formation of methane hydrate,and provide experimental data and theoretical basis for solving the drilling safety problems caused by wellbore blockage in the process of hydrate exploitation.
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