METHOD AND APPARATUS TO MONITOR REFORMATION AND REPLACEMENT OF CO2/CH4 GAS HYDRATES

摘要

A method for monitoring production from a methane hydrate reservoir includesobtaininga plurality of temperature measurements in a wellbore connected with themethane hydratereservoir; and deriving a parameter relating to conversion of methane hydrateto carbon dioxide(CO2) hydrate by injection of liquid CO2, wherein the deriving uses a modelingprogram and theplurality of temperature measurements, wherein the modeling program uses atleast oneparameter relating to a thermodynamic properties that are substantiallydifferent betweenmethane and CO2. The at least one parameter relating to thermodynamicproperties may includeJoule-Thomson coefficients of methane and CO2. The parameter relating to theconversion ofmethane hydrate to CO2 hydrate may include a ratio of methane and CO2 in amixed fluid.