Improvement of the hydrate simulation apparatus and evaluation of thermodynamic inhibitor performance
To solve the problem of wellbore blockage caused by hydrates inhibited during drilling,the structure of the stirring rod in the tank of natural gas hydrate generation and evaluation simulator and its internal head were redesigned and improved.Based on the improved experimental equipment,the generation rules of hydrate in fresh water and simulated seawater were studied,and the inhibition effects of NaCl,MgCl2 and Al2(SO4)3 on hydrate generation were compared and analyzed.The results show that compared with other experimental devices,the double reactor system with visual function can simulate hydrate generation experiments under different liquids and pressures at the same temperature.When the concentration fraction of thermodynamic inhibitor is 12％,the ions produced by NaCl can preferentially bind to water molecules and produce a powerful destructive effect,which is conducive to hydrate decomposition and has the best inhibition effect on hydrate generation.When the temperature,initial pressure and stirring speed were the same,the mass fraction of the three thermodynamic inhibitors was changed to analyze the pressure drop and the amount of hydrate generation.1％MgCl2,10％Al2(SO4)3 and 20％NaCl had the best inhibition effect on hydrate generation.The results have certain reference significance for understanding hydrate generation in different base fluids and the inhibition law of thermodynamic inhibitors,and provide ideas for formulating a safer drilling fluid system.
万方数据
维普
