Method for achieving geothermal power generation through double-working-medium underground heat exchange and heat exchange production structure

Abstract

The invention discloses a method for achieving geothermal power generation through double-working-medium underground heat exchange and a heat exchange production structure. The method comprises the following steps that an open hole section, a perforation section and a well section annulus are formed in a well from bottom to top; an electric submersible pump and a first packer are put into a geothermal production well through a production pipe column, and the open hole section and the perforation section are sealed and separated through the first packer in a setting mode; the production pipe column is separated from the electric submersible pump, and a second packer on the production pipe column sets and packs the perforation section and the well section annulus; a heat removal working medium injection pipe column is put down into the production pipe column, and high-pressure gas is injected into the annulus of the pipe column to replace accumulated liquid in the pipe column in a reverse circulation mode; the electric submersible pump is started to circulate geothermal fluid of a stratum, meanwhile, a liquid heat removal working medium, a gaseous heat removal working medium and the geothermal fluid are injected into the heat removal working medium injection pipe column to complete double-working-medium heat exchange at the well bottom, heat energy of the geothermal fluid is converted into heat removal working medium pressure energy, and the gaseous heat removal working medium is output from a well opening; and when the wellhead stably generates the gaseous heat removal working medium, the wellhead is switched to a turbine to drive a generator set to generate power.

Description

technical field [0001] The invention relates to the technical field of geothermal resource development, in particular to a process method for duplex heat exchange underground to realize power generation using medium-high temperature geothermal resources, that is, a method for duplex underground heat exchange to realize geothermal power generation and a heat exchange production structure. Background technique [0002] my country has huge reserves of geothermal resources, and geothermal resources are a kind of clean and renewable energy with important application value and development potential. With the continuous improvement of the requirements for reducing the use of fossil energy and reducing greenhouse gas emissions, and the continuous advancement of the carbon peak action plan and carbon neutral long-term planning, the development potential of clean and renewable energy such as geothermal energy, solar energy, and wind energy has been deeply tapped. It has become an inevi...

AI Technical Summary

Problems solved by technology

[0005] However, in this technology, the production process of the high-temperature formation fluid from the bottom of the well to the surface will continue to exchange heat with the formation or the pipe string, and the fluid will dissipate a large amount of heat during the flow of the thousands of meters of the pipe string, seriously affecting the Power generation efficiency of duplex geothermal power station

Images