The invention discloses a geothermal extraction
system based on a deep abandoned roadway and a construction method of the geothermal extraction
system. The geothermal extraction
system based on the deep abandoned roadway comprises a plugging material, a high-temperature water pipeline, a
heat pump unit, a low-temperature water pipeline and an inclined
drill hole, the
heat pump unit is located on the ground or in a shallow
underground space, the construction area of the
heat pump unit is located above the deep abandoned roadway, and a shallow underground
water layer is located above the deep abandoned roadway; the construction method of the geothermal extraction system based on the deep abandoned roadway specifically comprises the steps of drilling an inclined
drill hole, blocking the deep abandoned roadway and laying a pipeline. According to the scheme, shallow
groundwater and deep surrounding rock are thermally combined, the shallow
groundwater is used as a medium, and heat exchange is completed between a deep abandoned roadway and the surrounding rock; compared with a traditional geothermal well, according to the scheme, an original deep abandoned roadway is utilized, the working procedures of deep
well drilling, hole fixing, drilling and
pipe lowering and the like do not need to be conducted, and the construction cost of the deep geothermal well is reduced.