Cyclic methane hydrate production stimulated with CO2 and N2

The cyclic methane hydrate production method was proposed with CO 2 and N mixture stimulation. model established based on actual reservoir parameters, accordingly, the characteristics were analyzed, a sensitivity analysis conducted. results show following: (1) depressurization mechanism is dominant in production. CH 4 dissociation can be greatly enhanced because process effectively reduce partial pressure of (gas phase). However, there limited effect for storage. (2) Heat supply essential continuous dissociation. degree highest near-wellbore area; addition, fluid porosity effective permeability are significantly improved, temperature obviously decreased. (3) initial saturation, absolute permeability, intrinsic formation kinetic constant, injection time influence performance natural gas reservoir.