Patent ID: 8020382
Filing Date: 2011-09-20
Classification: F03G,F24T,Y02E

Abstract:
1. A closed loop system for heat recovery from two or more heat recovery levels in a geological formation comprising: (a) a central shaft extending from a surface level of the formation to more than 2,000 meters below that surface level, where the central shaft comprises a vertical cylindrical shell with insulated walls defining a central bore and an open upper end, having a closed bottom end, and comprising bore openings in the insulated walls or at the bottom end adapted to allow directional drilling means to pass from the central bore to the formation; (b) each heat recovery level comprising four or more bores extending radially from the bore openings in the central shaft and each bore containing exposed sections of bore pipes which in turn comprise a bend section, a generally horizontal section, and a terminal section; (c) each said bore pipe further extending upward within the central bore to the surface level for connection with a heat transfer fluid injection means and a heat transfer vapor receiving means; (d) electrical generation means connected with the heat transfer vapor receiving means, which in turn is connected with the heat transfer fluid injection means; and (e) heat transfer means incorporated into one or more said exposed sections for vaporizing a heat transfer fluid injected in liquid form at the heat transfer fluid injection means, transferred to heat transfer vapor receiving means, used for generation of electricity at the electrical generation means, and returned to the heat transfer fluid injection means.