We are doing research how to use exothermic heat of CO_2 hydrate formation for methane hydrate production increase. We had verified that CO_2 flows into sediments at the phase equilibrium temperature and pressure of CO_2 hydrate by experimental study in 2009. This verification shows that CO_2 can inject into sedimentary layers by considering the phase equilibrium condition of CO_2 hydrate. However we don't know how CO_2 hydrate would form when CO_2 is injected into the sediments which temperature is less the equilibrium temperature. The behavior of exothermic flow of CO_2 therefore must be experimentally verified.
