Method for exploring dry-hot-rock geotherm through underground heat siphon self-circulation

Abstract

The invention relates to the field of geothermal exploitation and provides a method for exploring dry-hot-rock geotherm through underground heat siphon self-circulation. The method includes the steps that a heat-carrying medium circular flowing channel is built underground, and self-circulation flowing of the heat-carrying medium in the underground channel is achieved by fully utilizing the phenomenon of heat siphon caused by the density difference of the heat-carrying medium at various temperature differences. The circular flowing channel can be achieved by drilling two horizontal well holes in different depth positions of an injection and production well, and can also be achieved by fracturing fractures and an upper horizontal well hole of the well bottom injection and production well. The heat-carrying medium flowing in a circulating mode drives a turbine generator to rotate for power generation in the flowing process, and accordingly the dry-hot-rock geothermal energy is explored as electric energy. According to the method, the heat siphon phenomenon of the heat-carrying fluid is fully utilized, underground self-circulation flowing is achieved, extra power from the outside is not needed, and the method is suitable for geothermal exploration of dry-hot-rock reservoirs with high reservoir temperature and severe ground environment.

Description

technical field [0001] The invention relates to the field of geothermal energy development, in particular to a geothermal method for exploiting dry hot rock self-circulation by underground thermosiphon. Background technique [0002] Geothermal is one of the promising renewable energy sources. Compared with other new energy sources such as solar energy, wind energy and biomass energy, it has the advantages of wide distribution, little external influence (such as day and night, wind speed, temperature difference), low carbon emissions and maintenance costs. Features. China is located in the Pacific Rim geotropic region and the Mediterranean-Himalayan geotropical region, with abundant geothermal resources. Traditional medium-high temperature geothermal reservoirs with high utilization value are usually located near volcanic belts with active tectonic movements, but limited by the geographical environment and the scale of reserves, the abundant geothermal energy cannot be effec...

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Problems solved by technology

However, when water injection is used to develop geothermal energy, there are problems such as high injection pressure and difficult reinjection due to the large water flow rate; at the same time, under high temperature conditions, a large amount of rock minerals will be dissolved in geothermal water, which not only affects the porosity and Permeability, can also lead to scaling problems in wellbore and surface equipment

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