Hot dry rock geothermal exploitation method for deep crack later-filling thermal reservoir
A mining method and hot dry rock technology, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult engineering, high engineering cost, and unbuilt hot dry rock geothermal power stations with commercial application value.
Pending Publication Date: 2021-09-14
TAIYUAN UNIV OF TECH
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Problems solved by technology
For this reason, the world's science and technology and engineering circles have researched and proposed a wide variety of hydraulic fracturing technologies, directional well construction technologies, and staged fracturing technologies for the construction of hot dry rock reservoirs, but all of them are difficult due to engineering difficulties. Due to the large size, high project cost, small heat exchange volume and poor heat exchange effect of the hot dry rock geothermal development system, no hot dry rock geothermal power station with commercial application value has been built in the world.
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[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail in combination with the embodiments and accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. The technical solutions of the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the scope of protection is not limited thereto.
[0029] A geothermal mining method of hot dry rock for late filling of deep fractures with thermal reservoirs, the specific steps are as follows:
[0030] (1) Through geological exploration, a hot dry rock reservoir 2 with fracture filling zone is reasonably selected. The temperature of the hot dry rock reservoir 2 with fracture-filling zones is higher than 200°C, and the inte...
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The invention relates to the field of geothermal exploitation, and provides a hot dry rock geothermal exploitation method for a deep crack later-filling thermal reservoir. According to the method, firstly, a water injection well and two production wells are constructed on the ground to the crack later-filling thermal reservoir, then a permeation channel network is built in a natural crack filling zone and a crack increasing area in granite by means of an auxiliary hydraulic fracturing technology, a large-size, high-permeability and complex-structure reservoir stratum is formed, and finally, hot dry rock geothermal energy is extracted to the earth surface by means of circulating water. According to the method, horizontal well construction is omitted, large-scale hot dry rock geothermal energy exploitation can be conducted with assistance of auxiliary hydraulic fracturing, and the construction cost and the hot dry rock geothermal energy extraction difficulty are greatly reduced.
Description
technical field [0001] The invention relates to the technical field of geothermal mining, in particular to a geothermal mining method for hot dry rock in which deep fractures are filled with thermal reservoirs later. Background technique [0002] As a high-quality, undeveloped geothermal resource, hot dry rock has abundant reserves in China and even in the world. The amount of hot dry rock geothermal resources in the world is (4.22-42.20)×10 19 J, which is equivalent to 100-1000 times of global fossil energy; the gradual development and utilization of hot dry rock resources has important strategic significance for my country to increase energy reserves, change the existing energy pattern and solve environmental pollution. [0003] At present, the Enhanced Geothermal System (EGS) is commonly used in the world to exploit hot dry rock geothermal energy. When using EGS to exploit hot dry rock geothermal energy, people generally regard the hot dry rock reservoir as a complete ,...
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IPC IPC(8): E21B43/30E21B43/26
CPCE21B43/30E21B43/26
Inventor 阴伟涛冯子军赵阳升靳佩桦
Owner TAIYUAN UNIV OF TECH