Patent ID: 9708885
Date: 2017-07-18
CPC Classifications: E21B,F03G,F24T,F28F,Y02E

Claim:
1. A geothermal well comprising: a wellhead at or above the surface of the earth; a wellbore extending from the surface of the earth to a subterranean location, wherein the wellbore has an inner wall; a metal casing disposed in the wellbore, wherein there exists an annular space between the inner wall of the wellbore and the outer wall of the metal casing; cement disposed in the annular space between the inner wall of the wellbore and the outer wall of the metal casing; a region void of cement in the annular space between the inner surface of the wellbore and the outer wall of the metal casing, wherein the region void of cement is below the surface of the earth; an injection conduit disposed in the casing, a portion of the injection conduit extended from the surface of the earth to a first location in a subterranean environment, wherein the injection conduit has a first inner diameter; a production conduit disposed in the casing, a portion of the production conduit extended from the surface to a second location in the subterranean environment, wherein the production conduit has a second inner diameter; wherein the production conduit is fluidly coupled to the injection conduit through the casing, the first inner diameter is greater than the second inner diameter; and a plug at the bottom of the casing to isolate the casing from the external environment.