Deep geothermal exploitation method based on carbon dioxide medium

Abstract

The invention provides a deep geothermal exploitation method based on a carbon dioxide medium. The deep geothermal exploitation method comprises the following steps that S1, an injection well and a production well are drilled; S2, the injection well and the production well are fractured; S3, CO2 fracturing is carried out; S4, CO2 heat energy utilization is carried out; S5, cyclic utilization of CO2 is carried out; and S6, CO2 storage is carried out. The method is advantaged in that CO2 is adopted as a fracturing medium and a heat exchange medium, pressure loss and fracturing difficulty in the flowing process of fracturing fluid can be reduced by taking CO2 as the fracturing medium, the heat exchange area of a heat storage stratum can be increased, intercommunication of a micro-fracture network system is promoted, and the reservoir transformation time is saved; meanwhile, CO2 serves as a heat exchange medium, the heat extraction capacity of a heat storage stratum can be improved, a large amount of CO2 can be stored in the underground deep part in the heat exchange process and after heat exchange, and carbon peak reaching and carbon neutralization can be achieved easily.

Description

technical field [0001] The invention relates to the technical field of new energy development and application, in particular to a deep geothermal extraction method based on a carbon dioxide medium. Background technique [0002] The world's fossil energy has been continuously consumed since the second industrial revolution, and it is facing the risk of depletion in the future. Energy security is related to the long-term stability of the country and the happy life of the people. Since the reform and opening up, my country has undergone earth-shaking changes. These brilliant achievements cannot be achieved without the support of natural resources represented by fossil energy. Since primary energy such as coal and petroleum accounts for a large proportion of my country's energy consumption, carbon dioxide and various nitrogen oxides will be released during energy consumption, which will damage the ecological environment. Therefore, we need to change the main direction of energy...

AI Technical Summary

Problems solved by technology

[0003]At present, hydraulic fracturing technology is commonly used in the construction of geothermal reservoirs, and its disadvantages are prominent: the peak pressure of rock breaking is insufficient, water body filtration is serious, and the damage to the reservoir is great. Many parts of the reservoir cannot be effectively stimulated, and heat storage and recovery are limited

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