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Water-liquid nitrogen alternate fatigue fracturing and heat collection rate improving method for hot dry rock

A technology of hot dry rock and liquid nitrogen, which is applied to collectors, mining fluids, and earthwork drilling and mining using groundwater as a working fluid. It can solve problems such as clogging of cracks and cracks, and achieve avoidance of danger, high cost, and low temperature. , good stability

Active Publication Date: 2019-08-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-liquid nitrogen alternate fatigue fracturing method for hot dry rock to increase the heat recovery rate, which can better solve the problem of crack network blockage caused by hydraulic fracturing

Method used

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  • Water-liquid nitrogen alternate fatigue fracturing and heat collection rate improving method for hot dry rock

Examples

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Embodiment 1

[0023] Such as figure 1 As shown, in the determined hot dry rock geothermal development area, adopting the method of the present invention intends to take geothermal energy in the dry hot rock layer at a depth of 3000m. Firstly, drilling equipment is used to construct the rock formations to build injection well 18, production well A17 and production well B21, so that the horizontal distance between injection well 18, production well A17 and production well B21 is 1000m-1500m respectively. Then use the method of the present invention to artificially create fractures in the hot dry rock formation, so that a huge fracture zone is formed between the injection well 18, the production well A17, and the production well B21. After the fracture is completed, a large amount of normal temperature or low temperature water is injected into the injection well 18 to fully exchange heat with the hot dry rock in the fracture zone, and then high temperature water or steam above 200°C is obtaine...

Embodiment 2

[0037] Such as figure 2 As shown, different from Example 1, the liquid nitrogen fracturing system also includes a liquid nitrogen tank B4, a gate valve B6 and a tee A7, and the outlet of the liquid nitrogen tank A1 passes through an inlet of the gate valve A3 and the tee A7 The outlet of the liquid nitrogen tank B4 is connected to the other inlet of the three-way A7 through the gate valve B6, and the outlet of the three-way A7 is connected to the inlet of the liquid nitrogen booster pump 8; the liquid nitrogen tank B4 is connected to the gate valve B6 A one-way valve B5 is provided on the connecting pipeline between them.

[0038] After the liquid nitrogen in the liquid nitrogen tank A1 is injected, switch the three-way A7, open the one-way valve B5 and the gate valve B6, and use the liquid nitrogen tank B to provide liquid nitrogen to ensure uninterrupted fracturing work.

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Abstract

The invention discloses a water-liquid nitrogen alternate fatigue fracturing and heat collection rate improving method for hot dry rock. The water-liquid nitrogen alternate fatigue fracturing and heatcollection rate improving method for the hot dry rock includes: first using high pressure water for fracturing the hot dry rock through jet nozzles in short time so as to form a major fracture, and then stopping hydraulic fracturing, injecting liquid nitrogen into the major fracture through the jet nozzles, and under the circumstance that the hot dry rock containing water generates extremely hugetemperature difference approximating 400 DEG C during the liquid nitrogen gasification process, enabling internal particles of the hot dry rock to generate various degrees of shrinkage distortion through the temperature difference so as to generate microfractures, and simultaneously fracturing the hot dry rock once more by using the expanded nitrogen which is obtained after the gasification and can easily enter the microfractures; repeating the above steps, respectively using the water and the liquid nitrogen for alternately performing fatigue fracturing so as to keep continuous quantity increase and dimension enlargement and achieve interconnection for the fractures of the hot dry rock, and thereby forming a complex and interconnected fracture seam net between an injection well and production wells; and finally, using the water as a heat carrying medium for exploiting geothermal energy. The water-liquid nitrogen alternate fatigue fracturing and heat collection rate improving method for the hot dry rock solves the problem that existing hydraulic fracturing causes blocking to a fracture channel, and improves heat collection rate.

Description

technical field [0001] The invention relates to the technical field of geothermal energy exploitation, in particular to a method for increasing heat recovery rate by water-liquid nitrogen alternate fatigue fracturing of hot dry rock. Background technique [0002] Hot dry rock refers to a kind of hot rock mass with no water or little water, dense and impermeable, which exists in the depth of 3000-10000m in the formation. The temperature is generally between 150-650℃, and it is a clean and renewable green resources. my country's development and utilization of hot dry rock geothermal energy technology is still in its infancy. Compared with the United States, France, Japan and other countries with more advanced technology levels, there is a big gap. [0003] Due to the deep burial and high in-situ stress of hot dry rock, the rock mass is dense, with small porosity, extremely low permeability, and basically contains no fluid. Therefore, when developing hot dry rock geothermal, ...

Claims

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Application Information

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IPC IPC(8): E21B43/26F24T10/20
CPCE21B43/26F24T10/20Y02E10/10
Inventor 程红梅高峰杨玉贵彭维红蔡承政张志镇邢燕袁丽
Owner CHINA UNIV OF MINING & TECH
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