Geothermal resources are a kind of renewable and clean energy with low carbon and environmental protection. Efficient and rational development of geothermal resources is of great significance to the adjustment of China's energy industry structure and the promotion of the goal of "carbon peak" and "carbon neutral". Aiming at the problems of low conversion efficiency and difficulty in large-scale development of traditional geothermal power generation, a geothermal power generation technology based on thermoelectric effect for oil and gas wells was proposed. A closed loop with fluid temperature difference was built by designing a downhole thermal motor device to realize efficient downhole thermoelectric conversion. The mathematical model of downhole heat flow temperature field was established to quantitatively predict the heat transfer efficiency of wellbore. The economic evaluation index of geothermal power generation was established to evaluate the economic feasibility of geothermal power generation. The results show that underground geothermal power generation technology can effectively convert thermal energy into electrical energy and is suitable for oil and gas wells with high water cut. Increasing the injection rate and installing multiple thermal motors in series can increase the power generation. The unit electricity cost of geothermal power generation technology is 0.6 yuan/kWh, which will further decrease with large-scale application of power generation cost. This paper provides a reference for China's high-temperature geothermal development, energy structure adjustment, energy conservation and emission reduction research.
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许博越,王磊,胡志强,等. 基于热电效应的地热资源发电技术[J]. 科学技术与工程, 2022, 22(3): 1011-1015. Xu Boyue, Wang Lei, Hu Zhiqiang, et al. Geothermal Power Generation Technology Based on Thermoelectric Effect[J]. Science Technology and Engineering,2022,22(3):1011-1015.