Patent ID: 8091632

Claim:
A method for the in-situ extraction of a hydrocarbonaceous substance, while reducing its viscosity, from an underground deposit with a device comprising: at least one injection pipeline which projects into the deposit and at least one production pipeline which leads from the deposit, wherein the injection pipeline and the production pipeline have in each case a starting section which extends partially above ground and an active section which is connected to the starting section and extends inside the deposit, wherein at least the active section of the injection pipeline is additionally formed as an induction heater with respect to its surroundings in the deposit, and wherein the method comprises: a heating-up phase, and a production phase following the heating-up phase, wherein during the heating-up phase, the injection pipeline and the production pipeline are exposed to admission of superheated steam, and wherein during the production phase, the injection pipeline but not the production pipeline is exposed to admission of superheated steam and the surroundings of the active section of the injection pipeline are additionally heated by means of the induction heater.