Geothermal resource development system and method using multi-branch radial horizontal well

Abstract

The invention discloses a geothermal resource development system and method using a multi-branch radial horizontal well, and relates to the field of geothermal energy development and utilization. Thegeothermal resource development system comprises a main well section, at least one horizontal well section, a heat pipe unit and a ground heat exchange system, wherein the lower end of the main well section is located on a geothermal rock reservoir; the horizontal well sections are arranged on the side wall of the lower end of the main well section; the heat pipe unit comprises at least one firstheat pipe and a second heat pipe, the first heat pipes are arranged in the horizontal well sections, the second heat pipe is arranged in the main well section, and one ends of the first heat pipes extends to the main well section for heat exchange with the lower end of the second heat pipe; and the ground heat exchange system comprises a ground heat exchange device for heat exchange with the upperend of the second heat pipe, a heat exchange device and a drive pump, the ground heat exchange device, the heat exchange device and the drive pump are in communication with one another to form a circulation pipe line. The heat transfer efficiency can be effectively improved, the energy loss rate in the transmission process is reduced, and the transmission of large heat under small temperature difference can be realized.

Description

technical field [0001] The invention relates to the field of geothermal energy development and utilization, in particular to a geothermal resource development system and method using multi-branch radial horizontal wells. Background technique [0002] With the development of society and economy, my country's demand for energy is expanding day by day. my country's dependence on foreign oil is approaching the 70% mark, and its dependence on natural gas has also risen to 45.3%. Energy security is related to social stability, so it is necessary to vigorously develop other energy exploration and development while ensuring the increase of oil and gas production capacity. In 2030, the proportion of non-fossil energy in my country is expected to increase to about 20%. my country plans to increase the proportion of non-fossil energy from 12% to 15% by 2020, and geothermal energy accounts for 1 / 3 of this 3% increase. Therefore, Accelerating the efficient development and utilization of...

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Problems solved by technology

According to previous studies, the development effect of multi-branched horizontal radial wells on the same thermal storage is significantly better than that of traditional well-enhanced geothermal systems. However, the multi-branch well system still relies on heat flow fluid to carry heat out, so the daily maintenance cost is high and requires constant maintenance. In addition, the heat transfer efficiency of the heat flow working medium is limited, and it is impossible to realize the transmission of large heat under a small temperature difference, and the energy loss rate is relatively large during the transmission process

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