Gas hydrate formation from high concentration KCl brines at ultra-high pressures

Abstract

The phase equilibria of methane hydrates were measured in high concentration KCl brines (up to saturation concentration) at ultra-high pressures (up to 200?MPa). The results show the hydrate equilibrium boundary moves to lower temperature and higher pressure as the KCl concentration increased up to the saturation limit and the hydrate equilibrium is unchanged from the saturation concentration for four-phase equilibrium. From the measurements at the saturation concentration, we also determine the pressure effect on the solubility of KCl. The kinetic studies reveal hydrates form even with salt precipitated and hydrates and salt are competing solid precipitation under saturated conditions. ? 2017 The Korean Society of Industrial and Engineering Chemistry