Method and apparatus to install a geothermal heat exchanger into a magma pool

A method for extracting geothermal heat energy comprising the steps of:

• providing a pre-installed in situ casing configured to access a liquid magma pool,
• providing a geothermal completion string,
• providing a drill bit,
• providing a heat exchanger assembly coupled to the drill bit and the geothermal completion string,
• wherein the heat exchanger assembly comprises a heat exchanger and an annular seal ring disposed between an inner tube and outer tube of the heat exchanger,
• wherein the annular seal ring comprises one or more pressure-activated mechanical valves configured to have a threshold opening pressure,
• providing one or more float valves disposed at a bottom of the heat exchanger, wherein the one or more float valves are configured to have an opening threshold pressure and are operable to prevent backflow into the heat exchanger when an applied surface pressure exceeds the opening threshold pressure, wherein the threshold opening pressure of the one or more pressure-activated mechanical valves is less than the opening threshold pressure of the one or more float valves and defines a pressure differential range,
• manipulating the applied surface pressure to allow either reverse circulation through the heat exchanger when the applied surface pressure is within the pressure differential range or allow conventional circulation through the heat exchanger and geothermal completion string when the applied surface pressure exceeds the pressure differential range, and
• drilling through strata utilizing conventional circulation,
• and penetrating into the liquid magma pool utilizing reverse circulation.