Axial Heat Exchange Closed Circulation Downhole Thermoelectric Power Generation System and Method

Abstract

The invention relates to a shaft type heat exchange closed circulation underground thermoelectric power generation system and method. The system comprises a shaft, a fluid circulating module and an electric energy output module. The shaft comprises a sleeve, an oil pipe, a thermoelectric power generation module, a cold fluid injecting pipe and a liquid collecting pipe. The oil pipe is sealed on the inner wall of the sleeve through crossing through a packer; and a through oil pipe plug is arranged at the bottom of the oil pipe. An oil sleeve annular flowing channel is formed in space between the inner wall of the sleeve and the outer wall of the thermoelectric power generation module. An oil pipe flowing channel is formed in internal space of the oil pipe. The cold fluid injecting pipe is arranged in the oil sleeve annular flowing channel or the oil pipe flowing channel. The fluid circulating module comprises a cold fluid injecting pipeline, a cold fluid injecting pump, a cold fluid flowing-out pipeline, a cold fluid storage container, a cold fluid flowing-in pipeline, a hot fluid utilization module, an oil sleeve annular return fluid flowing pipeline and an oil pipe return fluid flowing pipeline. The system can realize thermal power generation without water, provides stable electric energy supply, and cannot influence subsequent utilization of heat exchange fluids.

Description

technical field [0001] The invention belongs to the technical field of geothermal power generation, and in particular relates to an axial heat exchange closed cycle downhole thermoelectric power generation system and method. Background technique [0002] Geothermal energy is a renewable energy source from the depths of the earth. It has the characteristics of large reserves, cleanness, and sustainability. In the current situation of frequent extreme climate events and increasingly scarce energy, the rational development and utilization of geothermal resources has become more and more important. more and more people of all ages. Geothermal utilization is divided into two types: direct utilization and geothermal power generation. Direct utilization includes bathing, breeding, heating, cooling, planting, breeding, etc. Geothermal power generation can be divided into steam according to the type of heat carrier, temperature, pressure and other characteristics. There are two type...

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Problems solved by technology

These geothermal utilization methods all need to extract the thermal reservoir fluid to the ground for power generation or direct utilization. A large amount of thermal reservoir fluid exploitation will bring about problems such as potential formation subsidence and wellbore scaling, which restricts the geothermal energy to a certain extent. The Development of Thermal Energy Exploitation and Utilization

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