Technical Progress and Development Suggestion of Deep Geothermal Heat Storage Reconstruction

Geothermal resources are abundant in the deep strata. Due to the characteristics of high temperature, high hardness, high stress and high construction pressure, it is very difficult to economically utilize its heat energy by using the heat storage transformation technology. A large number of deep geothermal resources, such as deep high-temperature sedimentary rocks and dry hot rocks, have not been utilized on a large scale due to technical and economic reasons. This paper summarizes and analyzes the latest progress of deep geothermal reservoir reconstruction technology at domestically and internationally. It recognizes that conventional well-based injection and production models, as well as generalized fracturing techniques, are inadequate to meet the growing demand for efficient deep geothermal energy development. The paper advocates for the robust development of integrated well networks, such as vertical and horizontal wells, or pairs of horizontal wells, combined with segmented fracturing methods. Additionally, it emphasizes the need for the development of high-temperature-resistant tools, materials, and technologies for the quantitative characterization of fracture systems. These strategies are proposed to accelerate China’s energy transition and facilitate the achievement of dual carbon objectives.