Analytical model on natural gas hydrate dissociation with different phase equilibrium curves

•Propose a 1D analytical model for thermal chemical solution stimulation.•Investigate the performance of hydrate dissociation with different phase equilibrium curves analytically and numerically.•The position of moving dissociation front for four chemical solution are compared.•Delicate mathematical derivation are reported to be guideline for validation of our model and possible solutions of related future engineering problem. By introducing a moving dissociation interface, we build an analytical model of natural gas hydrate dissociation in porous media under thermal chemical solution stimulation method. Analytical solution of temperature distribution, pressure distribution are obtained by employing similarity solution. We investigate the behaviors of four thermal chemical solutions stimulation on hydrate dissociation and focus on the performance of hydrate dissociation under thermal 18%AlCl3 solution stimulation method including temperature distribution, pressure distribution, gas production volume, injected heat flux and compare to the performance under thermal pure water stimulation, showing the influence of changing phase equilibrium curve to hydrate dissociation. Parameters sensitivity analysis of hydrate dissociation is also presented in this paper. The advantages of inputting thermal chemical solution are the reduction of initial energy injection and variation of hydrate phase equilibrium curve.