Dry hot rock geothermal exploitation method

A mining method, hot dry rock technology, applied in the fields of fluid mining, geothermal energy power generation, earth drilling and mining, etc., can solve the problems of artificial heat storage in areas where hot dry rock cannot be built, and achieve low cost and difficulty, low construction pressure, The effect of reducing the difficulty of construction

Active Publication Date: 2019-07-12
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the traditional hydraulic fracturing method cannot build artificial heat storage in the hot dry rock area, the present invention provides a method for realizing geothermal exploitation by using the bottom inclination and hydraulic fracturing to crack the hot dry rock

Method used

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  • Dry hot rock geothermal exploitation method
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Embodiment 1

[0021] A geothermal mining method of hot dry rock, which is carried out in the following steps:

[0022] Step 1. Select the target layer, the target layer is 5.5km deep, mainly composed of granite, with a temperature of 200-230°C and a dip angle of 31°;

[0023] Drill two geothermal wells from the ground to the target layer, and the two geothermal wells are inclined to form inclined well sections in the target layer respectively, and the inclination angle of the inclined well sections is 60°, and the inclined well sections and the target Layers are vertical, and the inclined well sections of the two geothermal wells are distributed up and down in the target layer to form an upwardly inclined well section and a downwardly inclined well section, and the horizontal distance between the upwardly inclined well section and the downwardly inclined well section is 20m;

[0024] Step 2. Inject water at 20-25°C into the upwardly inclined well section as a low-temperature liquid, and the...

Embodiment 2

[0029] A geothermal mining method of hot dry rock, which is carried out in the following steps:

[0030] Step 1. Select the target layer. The target layer is 7.5km deep and mainly composed of granite and biotite gneiss. The ground construction pressure required for rupture is 112MPa. The minimum horizontal principal stress gradient of the formation is 2.3MPa / 100m, the pressure required for the fracture extension process is 97.5MPa, with additional fluid friction and fracture friction, the hydraulic fracturing pressure drop is higher than 140MPa;

[0031] Drill two geothermal wells from the ground to the target layer, and the two geothermal wells are inclined to form inclined well sections in the target layer, and the inclination angle of the inclined well sections is 60°. Distributed above and below the target layer to form an upwardly inclined well section and a downwardly inclined well section, the horizontal distance between the upwardly inclined well section and the downw...

Embodiment 3

[0037] A geothermal mining method of hot dry rock, which is carried out in the following steps:

[0038] Step 1. Select the target layer. The target layer is 4.3km deep, mainly composed of biotite gneiss and granodiorite, with a temperature of 280-305°C, a formation dip angle of 78°, and a fracture gradient of 2.8 MPa / 100m, the minimum principal stress gradient is 2.5MPa / 100m, the pressure required for the fracture extension process is 64.5MPa, with the addition of fluid friction and fracture friction, the hydraulic fracturing pressure drop is higher than 110MPa.

[0039] Drill two geothermal wells from the ground to the target layer, and the two geothermal wells are inclined to form inclined well sections in the target layer respectively. Distributed above and below the target layer to form an upwardly inclined well section and a downwardly inclined well section, the vertical distance between the upwardly inclined well section and the downwardly inclined well section is 18m; ...

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Abstract

The invention discloses a dry hot rock geothermal exploitation method. The dry hot rock geothermal exploitation method comprises the following steps of firstly, selecting a dry hot rock stratum with the stratum dip angle of 30-90 degrees as a target layer; injecting low-temperature liquid into the target layer to enable the target layer to crack to form a crack which is then developed continuouslyinto a crack network; and finally, injecting liquid into the target layer to collect heat. The dry hot rock geothermal exploitation method has the remarkable effects that the inclined stratum is selected as the target layer, the low-temperature liquid is injected into the target layer, and the crack network is formed in the target layer under the action of thermal stress, so that manual thermal storage is built in the dry hot rock, the required construction pressure is extremely low, the construction difficulty of manual thermal storage is greatly reduced, and the cost and difficulty of geothermal exploitation are lower.

Description

technical field [0001] The invention relates to a geothermal mining method, in particular to a geothermal mining method in hot dry rock areas. Background technique [0002] Geothermal energy is a kind of clean energy and renewable energy. The key technology of geothermal development and utilization lies in the construction of artificial heat storage. Artificial heat storage generally refers to the area where water and hot rocks are artificially built in the target stratum for heat exchange. Generally, it is characterized by the formation of a fracture network with developed fractures between two wells or a group of wells; at present, the commonly used method for constructing artificial heat storage is hydraulic fracturing, which generates macroscopic hydraulic main fractures in the rock body and intersects with many natural fractures to form Complex and developed fracture network. [0003] Hot Dry Rock (HDR) refers to a hot rock mass with a buried depth of 3-10 km, a temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24T10/20E21B43/30
CPCE21B43/305F24T10/20Y02E10/10
Inventor 曲海刘营吴康军张硕唐世茂胡誉双
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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