Geothermal well coiled tube heat exchanger

A geothermal well coiled tube heat exchanger belongs to geothermal energy development and utilization technology, and structurally comprises a metal sleeve heat preservation area I at the upper part and a coiled tube heat exchanger area II at the lower part, the metal sleeve heat preservation area I is structurally provided with a metal outer sleeve and a metal inner sleeve; the coiled tube heat exchanger area II structurally comprises a central shaft tube, a metal sieve tube, an upper tube plate and a lower tube plate which are encircled to form a circular barrel body; the upper ends of the central shaft tube and the metal sieve tube are respectively in sealed butt joint with the inner sleeve and the metal outer sleeve at the upper tube plate; the lower ends of the central shaft tube andthe metal sieve tube are in sealed butt joint with the lower-end hemispherical shell at the lower tube plate; the winding pipe is wound around the central shaft pipe in the annular barrel body; the upper and lower ends of the