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Building method for artificial dry-hot-rock geothermal reservoir

A construction method, hot dry rock technology, applied in geothermal power generation, other non-combustion heat generation, earth drilling and mining, etc., to achieve the effect of low fracture pressure

Active Publication Date: 2016-06-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings and deficiencies of hydraulic fracturing in the construction of hot dry rock geothermal artificial heat storage, and disclose a fully utilized The method of constructing hot dry rock geothermal artificial heat storage based on the characteristics of the geological structure

Method used

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  • Building method for artificial dry-hot-rock geothermal reservoir
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Experimental program
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Effect test

Embodiment approach 1

[0027] Implementation mode 1: if figure 1 , 4 As shown, in a delineated geothermal anomaly area, using the method of the present invention, it is desired to construct artificial heat storage in the hot dry rock layer at a depth of 2000m, and the well group layout is as follows figure 1 As shown, the distance from injection well 1 to production well 2 is 1000 m. After the artificial thermal reservoir is completed and put into use, a large amount of normal temperature water is injected from injection well 1. The above superheated steam or high temperature water is used for power generation.

[0028] Specific steps are as follows:

[0029] (1) In the delineated geothermal anomaly area, select the hot dry rock geothermal development area to arrange the "quadrangle" well group, as shown in figure 1 , the well group is composed of 5 drilling wells, the injection well 1 is located in the center, and the 4 production wells 2 are evenly distributed on the circle centered on the inje...

Embodiment approach 2

[0036] Implementation mode 2: if figure 2 , 4 As shown, in a delineated geothermal anomaly area, using the method of the present invention, it is desired to construct artificial heat storage in the hot dry rock layer at a depth of 3000m, and the well group layout is as follows figure 2 As shown, the distance from injection well 1 to production well 2 is 750m. After the artificial thermal reservoir is completed and put into use, a large amount of normal temperature water is injected from injection well 1. The above superheated steam or high temperature water is used for power generation.

[0037] Specific steps are as follows:

[0038] (1) In the delineated geothermal anomaly area, select the hot dry rock geothermal development area to arrange the "pentagonal" well group, as shown in figure 2 , the well group is composed of 6 drilling wells, the injection well 1 is located in the center, and the 5 production wells 2 are evenly distributed on the circle centered on the inj...

Embodiment approach 3

[0039] Implementation mode 3: if image 3 , 4 As shown, in a delineated geothermal anomaly area, using the method of the present invention, it is desired to construct artificial heat storage in the hot dry rock layer at a depth of 4000m, and the well group layout is as follows figure 1 As shown, the distance from injection well 1 to production well 2 is 500m. After the artificial thermal reservoir is completed and put into use, a large amount of normal temperature water is injected from injection well 1. The above superheated steam or high temperature water is used for power generation.

[0040] Specific steps are as follows:

[0041] (1) In the delineated geothermal anomaly area, select the hot dry rock geothermal development area to arrange the "hexagonal" well group, as shown in image 3 , the well group is composed of 7 drilling wells, the injection well 1 is located in the center, and the 6 production wells 2 are evenly distributed on the circle centered on the injecti...

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Abstract

The invention provides a building method for an artificial dry-hot-rock geothermal reservoir and belongs to the field of artificial dry-hot-rock geothermal reservoir building. According to the technical scheme, the method includes the steps that supercritical carbon dioxide fracturing is conducted on the soft weak face or an interlayer formed along the igneous rock phase to generate a major crack, then large displacement of hydrofracturing is conducted on the interior of the major crack to generate secondary fracturing, bulk fracturing or cluster type fracturing of a dry hot rock body is generated under cyclic fracturing, and the artificial geothermal reservoir is built. The building method has the beneficial effects that the characteristics of low viscosity and easy diffusion of the supercritical carbon dioxide and the characteristic that the crack is easy to form due to the fact that the fracturing pressure of igneous rock under supercritical carbon dioxide fracturing is low are fully utilized; and in combination with the characteristics that the igneous rock is of the obvious rock phase structure and thermal fracturing is easy to generate, the problems that current hydrofracturing cannot be implemented to building of the artificial geothermal reservoir in a deep rock mass, the fracturing pressure is large, the crack group or the crack band of an ideal structure is difficult to form, and an artificial geothermal reservoir stratum is particularly difficult to build are solved.

Description

technical field [0001] The invention belongs to the field of hot dry rock geothermal artificial heat storage construction, and particularly relates to a method of performing supercritical carbon dioxide fracturing on natural weak surfaces and weak interlayers formed along igneous rock facies to generate main fractures, and then performing large-displacement hydraulic pressure in the main fractures The artificial heat storage method is constructed in the form of volume fracture or cluster fracture of hot dry rock mass under cyclic fracturing. Background technique [0002] As a green and renewable resource, geothermal energy has been identified by countries around the world as a new "green energy" to maintain sustainable social development. Geothermal resources can be divided into two types: natural hot water resources and hot dry rock geothermal resources (HotDryRockGeothermalEnergy( HDR)). The amount of hot dry rock geothermal resources within 10km of the world's crust is 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/30E21B49/00F24J3/08
CPCE21B43/26E21B43/30E21B49/00F24T10/20Y02E10/10
Inventor 郤保平崔继明冯增朝赵阳升郑晓琛李广林
Owner TAIYUAN UNIV OF TECH
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