Abstract: A method and assembly adapted to extract petroleum from a bore hole or well and particularly using steam to release the petroleum from the surrounding underground. These method and assembly include the release of steam at the bottom of a tube section and extraction of petroleum above the steam outlet to provide simple and efficient assembly and method, which allow for simultaneous feeding of steam and pumping out of petroleum. The assembly includes coaxial tube sections wherein steam pipes are placed in the annular space between the tube sections to outwardly feed steam at the bottom of the latter while defining a central passage for pumping the petroleum therefrom.