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In this study, a radial 2D analytical approach has been developed to couplethe wellbore heating process and the associated methane hydrate dissociation inthe reservoir. A coaxial wellbore is assumed as the heat source where bothconduction and convection heat transfers are considered. It consists of aninner tube and an outer structure of casing, gravel, and cement layers. In thereservoir, a similarity solution employing a moving boundary separating thedissociated and undissociated zones is employed to build the analyticalsolution. Two different operating schemes for water supply into wellbore heatsource have been studied: i) from the inner tube; and ii) from the annulussection of the wellbore. Temperature distribution along the wellbore,temperature and pressure distributions in the reservoir, hydrate dissociationrate, and energy efficiency considering various initial and boundary conditionsand reservoir properties are evaluated. The two different operating schemeshave almost the same results with slightly higher gas production in the case ofhot water entry into annulus, which is in direct contact with the reservoir.Increasing the inlet water temperature or decreasing the wellbore pressureincreases gas production. Applying them simultaneously results in a greater gasproduction and energy efficiency. Some of the reservoir's properties, such asporosity, thermal diffusivity, thermal conductivity, and reservoir thickness,have direct relation with the dissociation rate, but the reservoir'spermeability and gas viscosity have almost no impact on the process. Thewellbore parameters, such as flow rate of hot water, inlet temperature, andwellbore radius except the inner tube radius, have direct impact on thewellbore mean temperature and the associated results in the dissociationprocess.

energy conversion and management

Analytical investigation of gas production from methane hydrates and the  associated heat and mass transfer upon thermal stimulation employing a  coaxial wellbore