US 12,729,883 B2Granted

Single-well heat exchange system and downhole enhanced heat exchange device of geothermal well

AssigneesChina Huaneng Group Clean Energy Technology Research Institute Co., Ltd, Huaneng (Fujian) Energy Development Co., Ltd

InventorsHaowei Yuan, Tieya Jing, Lianbo Liu, Deyuan Zhao, Yulong Yin, Shoucheng Wei, Mingyu Zhu, Xiaohui Guo, Jin Zheng

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Abstract

The embodiment of the present application discloses a single-well heat exchange system and a downhole enhanced heat exchange device of a geothermal well. The first main pipe communicates with an inner pipe of the single-well heat exchange device, return water entering the inner pipe sequentially enters the first main pipe and the second main pipe, part of the return water directly flows back to a geothermal reservoir, and part of the return water enters an annulus between the inner pipe and an outer casing of the single-well heat exchange device through a through hole of the second main pipe. The part, located at a target reservoir, of the retractable heat exchange pipe is used for absorbing geothermal heat of the target reservoir and transmitting the geothermal heat to an fixed end of the retractable heat exchange pipe to heat the return water entering the first main pipe.

Claims10

Dependent claims

A downhole enhanced heat exchange device of a geothermal well, comprising:

a first main pipe (1), an upper end of the first main pipe (1) being able to communicate with an inner pipe of a single-well heat exchange device;
a second main pipe (2) communicating with a lower end of the first main pipe (1), a pipe wall of the second main pipe (2) being provided with a through hole communicating with an annulus between the inner pipe and an outer casing of the single-well heat exchange device;
and
retractable heat exchange pipes (3), the retractable heat exchange pipes (3) being able to extend and retract along the radial direction of the first main pipe (1), a fixed end of the retractable heat exchange pipe (3) being located in the first main pipe (1) and sealingly connected with the first main pipe (1), and a free end of the retractable heat exchange pipe (3) being able to extend into a target reservoir by the annulus to absorb the heat of the target reservoir for heating return water of the inner pipe.

1 more element

Dependencies are inferred from the claim text.