Middle-deep geothermal well device with heat transfer enhancement and anti-blocking functions and anti-blocking method thereof

Abstract

The invention discloses a medium-deep geothermal well device with heat transfer enhancement and anti-blocking functions. The medium-deep geothermal well device comprises an outer sleeve and an inner sleeve arranged in the outer sleeve. A gap between the outer sleeve and the inner sleeve is a first water flow channel; a second water flow channel is arranged in the inner sleeve; the first water flow channel flows into the second water flow channel through a jet flow hole formed in the pipe wall of the inner sleeve; a spiral first fin is arranged in the first water flow channel in the length direction of the outer sleeve. One-way flowing and anti-blocking functions of a circulating working medium are achieved through the multiple layers of different-diameter jet flow holes and the non-return baffle, solid particles such as impurities in the inner sleeve are cleaned through opening and closing of the discharging baffle, heat exchange enhancement is achieved through staggered combination of the high fins and the low fins, the output of a heat exchange well is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of mid-deep geothermal wells, in particular to a mid-deep geothermal well device with heat transfer enhancement and anti-blocking functions. [0002] technical background [0003] The exploitation of mid-deep geothermal energy usually adopts the closed-loop mode of "extracting heat without extracting water", that is, the fluid heat transfer medium is used to absorb the heat of the underground rock through the heat exchange of the geothermal well, and then flows through the surface heat exchanger to release the heat. [0004] The above mining mode effectively avoids the direct contact or mass transfer between the open system and groundwater or rock formations, and eliminates the impact on the biochemistry of groundwater formations, and has less restrictions on geological conditions, and can be flexibly applied to a variety of geological conditions. Therefore, it has been widely used in the context of "double c...

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Problems solved by technology

During operation, the circulating working medium flows downward from the gap between the inner and outer casings, reaches the bottom of the geothermal well, and enters the inner casing through the backflow port at the bottom of the inner casing. Blockage occurs due to the influence of impurities, sediment and corrosion, which affects the normal operation and service life of geothermal wells

[0006] At the same time, the conventional outer casing is usually made of smooth steel pipe. This structure can make the circulating working medium flow smoothly, but the flow turbulence intensity is low, and the convective heat transfer coefficient is small. It is difficult to increase the heat transfer efficiency of geothermal wells, which is not conducive to improving the geothermal wells. Contribute

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