Double-well closed circular downhole thermoelectric power generation system and method

Abstract

The invention relates to a double-well closed circular downhole thermoelectric power generation system and method. The system includes an A shaft, a B shaft, a fluid circulation module and an electrical energy delivery module, wherein the A shaft and the B shaft penetrate through a same stratum at the same time. The A shaft includes an A shaft casing pipe, an A shaft oil tube and an A shaft thermoelectric power generation module. The B shaft includes a B shaft casing pipe, a B shaft oil tube and a B shaft thermoelectric power generation module. Perforation segments are arranged on the A shaftcasing pipe and the B shaft casing pipe respectively. An A shaft oil jacket annular flow passage is formed in the space between the A shaft casing pipe and the A shaft thermoelectric power generationmodule; an A shaft oil tube flow passage is formed in the internal space of the A shaft oil tube. A B shaft oil jacket annular flow passage is formed in the space between the B shaft casing pipe and the B shaft oil tube; a B shaft oil tube flow passage is formed in the internal space of the B shaft oil tube on the inner side of the B shaft thermoelectric power generation module. According to the system and method, stable power supply can be provided, medium and low temperature geothermal resources can be fully utilized, and subsequent utilization of produced fluid cannot be affected.

Description

technical field [0001] The invention belongs to the technical field of geothermal power generation, and in particular relates to a double-well closed circulation downhole thermoelectric power generation system and method. Background technique [0002] Geothermal energy is a special resource from the interior of the earth, and it is also a new clean energy. Under the circumstances of frequent extreme climate events and increasingly scarce energy sources, more and more people pay more and more attention to the rational development and utilization of geothermal resources. Direct utilization and geothermal power generation are the two main types of utilization of geothermal energy. Direct utilization includes recuperation, breeding, heating, industrial drying, bathing, etc. Geothermal power generation is divided into steam type according to the type of heat carrier, temperature, pressure and other characteristics. There are two types of geothermal power generation and hot water...

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Problems solved by technology

[0004] Aiming at the technical limitations of traditional geothermal power generation methods and the production characteristics of medium and low temperature heat storage in my country, and considering the potential environmental problems existing in the existing geothermal exploitation and utilization process, this invention combines thermoelectric power generation technology to propose a double well closed cycle Downhole thermoelectric power generation system and method, the system and method can not only provide stable power supply, make full use of medium and low temperature geothermal resources, but also will not affect the subsequent utilization of produced fluid

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