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

A technology of hot dry rock and heat rainbow, which is applied in the direction of collectors using groundwater as the working fluid, mining fluid, geothermal power generation, etc., and can solve problems such as high injection pressure, difficult reinjection, scaling of wellbore and ground equipment, etc. , to achieve the effect of reducing kinetic energy loss, reducing economic investment, and efficient conversion

Inactive Publication Date: 2016-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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 temp

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

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] A method for self-circulating mining of hot dry rock geothermal energy by using underground thermosiphon, the specific steps are as follows:

[0033] (1) After geological exploration, a medium-high temperature hot dry rock reservoir 3 is reasonably selected. ;

[0034] (2) Two vertical wells 6 and 8 are drilled in the hot dry rock reservoir 3, and the distance between well 6 and well 8 is 500-1000m;

[0035] (3) Use hydraulic fracturing technology to hydraulically fracture two wells to build artificial geothermal reservoirs 4, in which a single well needs about 10,000-50,000 m of fracturing fluid 3 , the fracturing radius is 250-500m;

[0036] (4) Open the injection well 6 and the production well 8, and inject the low-temperature heat-carrying medium (such as water, supercritical CO2, and other heat-carrying fluids and mixtures thereof) from the wellhead of...

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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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Application Information

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IPC IPC(8): E21B43/00E21B43/26F24J3/08F03B13/00F03G4/00
CPCE21B43/00E21B43/255E21B43/26F03B13/00F24T10/20Y02E10/10
Inventor 张亮崔国栋任韶然许素丹杨若涵
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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