United States Patent - 9,803,626, October 31, 2017
Applicant: GreenFire Energy, Inc., Salt Lake City, Utsh, USA
Methods for thermalsiphoning supercritical CO.sub.2 within a geothermal formation includes providing a geothermal energy system that includes an underground hot rock reservoir, a production well, and an injection well that together form a fluid path suitable for circulating supercritical CO.sub.2.
The supercritical CO.sub.2 flows by thermosiphoning. Thermosiphoning is maximized by maintaining a pressure between 1400-4000 psia, an injection temperature in a range from 50-200 C and a production temperature in a range from 150-600 where injection temperature and the production temperature differ by at least 50.degree. C.
From the Global Geothermal News archives:
- Tuesday, September 26, 2017 - USA, California: Project Demonstrating Geothermal Power Generation Using Supercritical Fluids Set to Begin
- Thursday, April 6, 2017 - USA, California: Coso KGRA Chosen to Demonstrate Supercritical CO2 Geothermal Energy Project
- Thursday, March 16, 2017 - USA, California: Grant Awarded for First Demo of Closed-Loop Geothermal Power Generation Using Supercritical CO2
