Method for building hot-dry rock artificial geothermal reservoir by using natural geological faults

Abstract

The invention belongs to the technical field of construction of hot-dry rock artificial geothermal reservoirs, and particularly relates to a method for building a hot-dry rock artificial geothermal reservoir by using natural geological faults. The method comprises the following steps that 1, the occurrences, the number and the sizes of the faults in a hot-dry rock geothermal development area are determined; 2, a well group is arranged and designed along the trend of the target fault, wherein according to the arrangement way of the well group, shafts are linearly arranged in a one-injection-two-return way; 3, an injection well is drilled in the center of the trend of the target fault; 4, in the combination of the geophysical prospecting imaging technology, the macro-size of a large-fault and the azimuthal angle of a drilling hole are determined, and according to the macro-size and the azimuthal angle, the occurrence of the target fault can be precisely determined; 5, the target fault and near fracture zones are used as the fracture development artificial geothermal reservoir which is high in permeability and large in heat exchange area; 6, a lot of room-temperature water is injectedinto the injection well, heat exchange is conducted through the natural artificial geothermal reservoir crack network of the target fault, transformation from solid heat to liquid heat is achieved, and high-temperature water and over-hot water vapor are produced from production wells to be used for electricity generation or heat supply.

Description

technical field [0001] The invention belongs to the technical field of hot dry rock geothermal artificial heat storage construction, in particular to a method for constructing dry hot rock artificial heat storage by utilizing natural geological faults. Background technique [0002] The development of the world economy relies heavily on the development and use of fossil energy, but the use of fossil energy will bring a series of environmental problems. People are eager to develop new energy sources. Compared with clean energy sources such as solar energy, wind energy, and water energy, geothermal energy has an overwhelming advantage that it is not affected by climate and seasons. 30 times the amount. Hot dry rock refers to a high-temperature rock mass buried 3 to 10 km underground with a temperature of 150°C to 650°C that contains no or slightly stagnant water and has extremely poor permeability. Artificial heat storage is to use the existing technology to carry out permeab...

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Problems solved by technology

[0003] Practice has proved that hydraulic fracturing technology has achieved relatively good results in the field of reservoir reconstruction for conventional natural gas and unconventional energy exploitation. , and occurs in igneous rocks, so the requirements for hydraulic fracturing technology are relatively high, and the existing technology and equipment cannot meet the engineering needs, and it is difficult to build artificial heat storage in dry hot rocks through hydraulic fracturing; secondly, hydraulic fracturing technology The fractures generated are single and the heat transfer area is limited, which restricts the commercialization of hot dry rock geothermal development

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