Patent ID: 7320221
Filing Date: 2008-01-22
Classification: F02C,F03G,F05D,Y02E

Abstract:
1. Method for recovering geothermal heat, which comprises enhancing the flow of geothermal fluid from at least one injection well to at least one production well, by the following steps: a. Providing a first, horizontal, geothermal well in the ground at a geological layer having an elevated temperature, which is used as said injection well; b. Injecting water into said injection well, whereby the injected water is heated; c. Providing a second, horizontal, geothermal well in the ground, which is used as said production well, such that said second, horizontal, production, geothermal well is substantially horizontally and vertically spaced from said first, horizontal, injection, geothermal well by a distance dependent on the elevated temperature and located at a shallower depth than said first, horizontal, injection, geothermal well; d. Recovering geothermal fluid from said production well; e. Generating a water density difference and a pressure difference between said first horizontal, injection well and said second horizontal, production well; and f. Inducing geothermal fluid into said second horizontal geothermal well from the geological layer because of buoyancy of the water and the pressure difference between the horizontal injection and horizontal production wells.