Device for in-situ extraction of a hydrocarbonaceous substance

Device for in-situ extraction of a hydrocarbonaceous substance, while reducing its viscosity, from an underground deposit (100). The device comprises at least one from the reservoir (100) leading out production pipeline (102, 102 '). Furthermore, the device comprises at least two electrodes (301, 301 ') which at least parts of the deposit (100) are inductive and resistive to take effect.