The invention discloses a medium and deep layer
geothermal energy collection same well withdrawing
system. A collection well and a heat exchanging
assembly are included; the collection well comprisesa well body which comprises a lower
heat energy extraction area and an upper recharging area; the adjacent position between the
heat energy extraction area and the recharging area is provided with a closing device; the center of the closing device is provided with a through hole used for a
water pumping pipe to pass through; the lower end of the
water pumping pipe extends into the
heat energy extraction area; the lower end of the
water pumping pipe is connected with a
submersible pump used for pumping
geothermal water; the position between the outer side of a well pipe of the recharging area and the inner wall of a well hole is filled with a
quartz sand filtering material layer; and the heat exchanging
assembly comprises a filtering purification device and a
heat exchanger. The collectionwell with the water pumping and water returning functions is adopted, the heat in the medium and deep layer
geothermal water is collected and utilized, but the
geothermal water is not consumed, the geothermal water is high in recharging rate after heat exchanging, lowering of an underground
water level cannot be caused, and changing and damage of a geologic structure cannot be caused. The medium and deep layer
geothermal energy collection same well withdrawing
system is small in occupied area, convenient to construct and maintain, lower in cost and higher in resource utilizing rate.