Abstract: The present invention is directed to using depressurization methods to create mobile fluid zones for producing fluids from a Class 3 hydrate reservoirs through a well. Aspects of the present invention include a two stage method wherein the first stage includes producing fluid from a hydrate interval within the Class 3 hydrate reservoir through a well at a constant pressure and forming an interface, and the second stage includes producing fluid through the interface at a constant mass rate and heating the well.

Abstract: The present invention is directed to using depressurization methods to create mobile fluid zones for producing fluids from a Class 3 hydrate reservoirs through a well. Aspects of the present invention include a two stage method wherein, the first stage includes producing fluid from a hydrate interval within the Class 3 hydrate reservoir through a well at a constant pressure and forming an interface, arid the second stage includes producing fluid through the interface at a constant mass rate and heating the well.

Abstract: A method for formation of subsurface barriers using viscous liquids where a viscous liquid solidifies at a controlled rate after injection into soil and forms impermeable isolation of the material enclosed within the subsurface barriers. The viscous liquid is selected from the group consisting of polybutenes, polysilotanes, colloidal silica and modified colloidal silica of which solidification is controlled by gelling, cooling or cross-linking. Solidification timing is controlled by dilution, addition of brines, coating with alumina, stabilization with various agents and by temperature.