Patent ID: 8365815

Claim:
A system for utilization of geothermal heat comprising a main pipe, wherein the main pipe is divided into an upper part and a lower part by a transverse seal, and wherein the transverse seal has an opening which has a pump arranged therein that triggers and/or supports flow, which conveys water from the lower part of the main pipe, said pump being connected with an extraction pipe which in turn is connected with an above-ground closed circuit, said closed circuit, at its other end, leading to the upper part of the main pipe, and the main pipe having through-openings towards the surroundings upstream and downstream of the transverse seal, said through-openings towards the surroundings downstream of the transverse seal being in form of filter sections and said main pipe being surrounded by a porous bed which is a glass bed made of glass spheres which surrounds the remaining hollow space of the bore around the main pipe, said porous bed being interrupted by a sealing material at the level of the transverse seal inside the main pipe so that the porous bed is hydraulically interrupted, wherein the glass spheres have a diameter of 0.5 to 10 mm and wherein the porous bed has an effective pore space of more than 30%.