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Research On Hydrothermal Geothermal Development System of Multi-Branch Wells
Geothermal resources are characterized by green low-carbon, clean environmental protection, stable and reliable. Vigorously developing and utilizing geothermal resources is of great significance to adjust the energy structure of our province, save energy and reduce emissions, control pollution and reduce haze, boost the realization of national double carbon goals, and contribute to the high-quality development of China's geothermal power. Therefore, the development of clean renewable energy is an important new way to maintain sustainable development. As a kind of clean renewable energy with important application value and utilization potential, geothermal resources are extremely abundant in China. The amount of shallow geothermal resources corresponds to 9.5 billion tons of standard coal, 853 billion tons of middle and deep geothermal resources, and 8.6 trillion tons of dry hot rock geothermal resources. The total power generation potential of hydrothermal geothermal resources exceeds 10 million kW. Therefore, it is of great political and economic significance to accelerate the effective development and utilization of geothermal resources, such as hydrothermal resources, to optimize China's energy structure and promote sustainable development. Geothermal productivity mainly refers to the heat harvesting power of geothermal Wells, which is mainly related to formation temperature, permeability, reservoir thickness, well trajectory and heat harvesting methods. Multi-lateral well refers to the technology of drilling multiple lateral Wells in the same wellbore, which can simultaneously exploit reservoir resources in multiple intervals, reduce the footprint, well location and relocation process of supporting equipment, increase the total length and contact area of the well in the development zone, and improve production. Especially for middle and low permeability geothermal reservoirs, multi-branch Wells can make full use of their advantages for development. Therefore, using multi-branch Wells to exploit geothermal resources has great potential and is one of the important research directions for efficient exploitation of geothermal resources in the future. At the same time, as an important direction of future development, intelligent drilling technology is expected to achieve successful drilling of complex well track with multiple branches, and provide corresponding technical support for efficient development of geothermal reservoir with complex multiple branches. Drilling project is an important link in the whole geothermal reservoir development process, and provides an effective channel for geothermal resources to be transported to the ground. Therefore, the design of drilling program has an important influence on the exploitation effect. In the design of drilling scheme, the key well parameters such as the number of branches, the length of branches, the spacing of branches and the well orbit are optimized to maximize the profit. Therefore, the research and exploration of borehole parameter optimization design of multi-branch well is of great significance to the efficient development of hydrothermal geothermal system.