Numerical simulation study on performance evaluation and change law of hydrate thermodynamic inhibitor

In order to solve the problems of high consumption and low efficiency of hydrate inhibitors, the inhibition effects of five thermodynamic inhibitors including methanol, ethylene glycol, diethylene glycol, triethylene glycol and ethanol with different contents on hydrate formation were studied by numerical simulation, and their inhibition performances were also evaluated. The results show that all the five thermodynamic inhibitors have inhibition effect on hydrate formation, and with the accumulation of total content, the inhibition effect of unit content of ethylene glycol gradually increased, unit content of diethylene glycol and ethanol gradually weakened, the unit content of triethylene glycol decreased first and then increased, unit content of methanol basically unchanged respectively. When the molar fraction is less than 10% or more than 20%, the inhibition performance of triethylene glycol is the best. Moreover, ethylene glycol is better at medium content, but ethanol and diethylene glycol are poor in the whole range. The results can provide a reference for the selection of hydrate inhibitors to save cost and achieve the purpose of efficient utilization.