Patent ID: 8820075

Claim:
A method for producing geothermal energy from a fractured subsurface formation, comprising: a) fluidically coupling an injection well to each of two zones in the fractured subsurface formation, wherein each of the two zones are vertically stacked in the fractured subsurface formation, wherein the fluidic coupling to each of the two zones is configured to be independently controlled and wherein the two zones comprise a first zone and a second zone; b) fluidically coupling a production well to each of the two zones, wherein the fluidic coupling to each of the two zones is configured to be independently controlled; c) injecting through the injection well a first volume of fluid into the first zone while not injecting fluid into the second zone and simultaneously producing through the production well a second volume of fluid from the second zone while not producing fluid from the first zone, and then; d) injecting through the injection well a third volume of fluid into the second zone while not injecting fluid into the first zone and simultaneously producing through the production well a fourth volume of fluid from the first zone while not producing fluid from the second zone; e) cyclically performing steps c) and d), wherein the second volume of fluid and the fourth volume of fluid each comprise a geothermally heated fluid.