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US 6,668,554 B1 13 14 (b) allowing the ?uid to absorb heat from the hot dry rock ofthereservoirandtherebyincreasetheheatcontentof the?uid; (c) removing at least a portion of the ?uid having an increased heat content from the underground hot rock reservoir; and (d) extracting heat from the portion of ?uid having an increased heat content. 2. The method as recited in claim 1 further comprising the stepsof: (e)reintroducingbackintothereservoiratleastaportion of the ?uid from Which heat has been extracted; (f) alloWing the reintroduced ?uid to absorb heat from the hot dry rock again; (g) removing at least a portion of the reintroduced ?uid having an increased heat content from the underground hot dry rock; and (h) extracting heat from the reintroduced ?uid having an increased heat content. 3. The method as recited in claim 1 Wherein the creation of the hot dry rock reservoir comprises injecting the ?uid into a packed off interval of an openhole Wellbore and thence into a deep region of hot dry rock. 4.Themethodasrecitedinclaim1Whereinthehotdry 25 rock reservoir is at a depth in the range of from about 1,000 feet to about 30,000 feet. 5. The method as recited in claim 1 Wherein the hot dry rock of the hot dry rock reservoir has a temperature in the range from about 120° C. to about 1,000° C. 6. The method as recited in claim 5 Wherein the tempera ture of the hot dry rock of the hot dry rock reservoir has a temperature in the range of from about 150° C. to about 500° C. 7.Themethodasrecitedinclaim1Whereinthehotdry 35 rock of the hot rock reservoir comprises rock selected from the group consisting of igneous, metamorphic and sedimen taryrock. (c) removing at least a portion of the ?uid having an increased heat content from the underground hot dry rock reservoir; and (d) extracting heat from the portion of ?uid having an increased heat content. 13. The method as recited in claim 12 Wherein the ?uid is injected into the underground reservoir region through at least one injection Well. 14. The method as recited in claim 12 Wherein the ?uid is injected into the underground reservoir region through a pluralityofinjectionWells. 15. The method as recited in claim 12 Wherein the ?uid is conducted from said reservoir region through at least one 8. The method as recited in claim 1 Wherein the ?uid is injectedatapressureintherangefromabout1,000psito about 15,000 psi. 9. The method as recited in claim 1 Wherein the ?uid is injected through an open Wellbore for an injection period in the range from about a feW hours to several months. 10. The method as recited in claim 1 Wherein the ?uid is 45 injected through an open Wellbore for an injection period in the range from about 1 Week to about three months. 11. The method as recited in claim 1 Wherein the ?uid is injected at a rate in the range from about 20 to 60 kilograms per second. 12. A method of extracting geothermal energy from an undergroundhotdryrockreservoir,comprisingthestepsof: (a)injecting?uidconsistingessentiallyofcarbondioxide into an underground hot dry rock reservoir, the ?uid carbon dioxide comprising ?uid in the supercritical 55 phase or carbon dioxide ?uid that is transformed into the supercritical phase by the hot dry rock; (b) alloWing the ?uid to absorb heat from the hot dry rock of the hot dry rock reservoir and thereby increase the heat content of the ?uid; 10 15 productionWell. 16. The method as recited in claim 12 Wherein the ?uid is conducted from the reservoir region through a plurality of productionWells. 17. The method as recited in claim 12 Wherein after the 20 stepofheatextractionthe?uidiscirculatedbackintothe underground reservoir. 18. The method as recited in claim 12 Wherein the ?uid is conducted from said reservoir region by pumping and ther mal siphoning. 19. The method as recited as recited in claim 12 Wherein the hot dry rock reservoir comprises rocks selected from the group consisting of igneous, metamorphic and sedimentary rocks. 20. The method as recited in claim 12 Wherein the temperatureofthehotdryrockreservoirisintherangefrom about 120° C. to about 1,000° C. 21. The method as recited in claim 12 Wherein the temperatureofthehotdryrockreservoirisintherangefrom about 150° C. to about 500° C. 22. The method as recited in claim 12 Wherein the hot dry rock reservoir is at a depth in the range from about 1,000 feet to about 30,000 feet. 23. The method as recited in claim 12 Wherein the ?uid is injected at a pressure in the range from about 1,000 psi to 30 40 about15,000psi. 24. The method as recited in claim 12 further comprising 50 removing Water from the portion of ?uid that has been removed from the reservoir. 25. The method as recited in claim 12 Wherein heat is extracted from the heated ?uid using a poWer generation system in a surface poWer plant. 26. The method as recited in claim 25 Wherein the heated ?uid is expanded directly into a turbine poWer generator. 27. The method as recited in claim 25 Wherein the heated ?uid is conducted through a heat exchanger, thereby trans ferring heat to a turbine poWer generator Working ?uid. 28. The method as recited in claim 27 further comprising injecting the ?uid from the turbine poWer generator back into the underground reservoir. 29. The method as recited in claim 12 Wherein substances that dissolved into the ?uid from the hot rock reservoir are separatedfromthe?uidafterremovingthe?uidfromthehot dry rock reservoir.PDF Image | GEOTHERMAL ENERGY PRODUCTION WITH SUPERCRITICAL FLUIDS
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