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Method for developing hot dry rock geothermal resources through using gravity drainage technology

A hot dry rock technology, which is applied in the field of developing hot dry rock geothermal resources by gravity drainage, can solve problems that have not been raised, and achieve the effects of compact rock, reduced drilling costs, production and operation costs, and low permeability

Inactive Publication Date: 2020-04-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat transfer shape can be improved from "plane" to "volume" to develop hot dry rock, it is believed that it will have a profound impact on the overall development of hot dry rock geothermal resources. Feasible plan for drilling two parallel wells on the same elevation

Method used

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  • Method for developing hot dry rock geothermal resources through using gravity drainage technology
  • Method for developing hot dry rock geothermal resources through using gravity drainage technology
  • Method for developing hot dry rock geothermal resources through using gravity drainage technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 and figure 2 As shown, the injection well 3 and the production well 4 are two horizontal wells, and they are parallel, and the vertical distance of the horizontal section is 7 meters. The horizontal distance between each pair of injection and production wells is 50m, and the length of the horizontal section is 750m. The injection pipeline of the vertical well section of the production well is equipped with a wellbore insulation layer. For details of the structure, see image 3 . This design is suitable for hot dry rock formations with a temperature of 150-350°C. The number of cycles increases and heat loss is reduced.

[0049] The use of the insulation layer can ensure that the produced liquid reduces heat loss in the vertical well section, and the injection well pipeline does not need to add an insulation layer, so that the injected fluid can fully exchange heat with the formation. In the horizontal section of the injection well, it is considered...

Embodiment 2

[0051] The injection well 3 and the production well 4 are two horizontal wells, and they are parallel, and the vertical distance of the horizontal section is 5 meters. The horizontal spacing of each pair of injection-production wells is 30m, and the length of the horizontal section is 1000m. The injection pipeline of the vertical well section of the production well is equipped with a wellbore insulation layer. For details of the structure, see image 3 . This design is suitable for hot dry rock formations with a temperature of 200-500°C. The number of cycles increases and heat loss is reduced.

[0052] The use of the insulation layer can ensure that the produced liquid reduces heat loss in the vertical well section, and the injection well pipeline does not need to add an insulation layer, so that the injected fluid can fully exchange heat with the formation. In the horizontal section of the injection well, it is considered to run the injected fluid distribution string to en...

Embodiment 3

[0053] Embodiment 3. A method of utilizing gravity drainage to integrally develop hot dry rock geothermal resources according to the present invention.

[0054] Such as figure 1 and figure 2 As shown, the injection well 3 and the production well 4 are two horizontal wells, which are parallel, and the vertical distance between the horizontal sections is 5 meters. The horizontal spacing of each pair of injection-production wells is 80m, and the length of the horizontal section is 1500m. The injection pipeline of the vertical well section of the production well is equipped with a wellbore insulation layer. For details of the structure, see image 3 . This design is suitable for hot dry rock formations with a temperature of 350-550°C. Cycle times are reduced and heat transfer is more efficient.

[0055] Based on the data of various embodiments, it can be known that the method for the overall development of hot dry rock geothermal resources by gravity drainage according to th...

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Abstract

The invention provides a method for developing hot dry rock geothermal resources through using a gravity drainage technology. The method comprises the three steps of injection-production well design and well drilling, inter-well fracturing communication and high-pressure water injection production. In the well drilling stage, vertical fracturing and longitudinal communication are carried out on anupper horizontal well and a lower horizontal well which are parallel to each other, so that the upper injection-production horizontal well and the lower injection-production horizontal well meet therequirements of flow communication and pressure communication; in the production stage, low-temperature water is injected into an upper injection well and then subjected to sufficient heat exchange with a stratum, so that high-temperature water is extracted from a lower production well, extracted heat energy is comprehensively utilized for power generation and the like, and the treated water is circularly injected back into a dry hot rock stratum. According to the technical scheme, the gravity settling principle and a method for improving the heat exchange efficiency through crack auxiliary fluid flowing are combined, and the development efficiency of the hot dry rock geothermal resources can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of hot dry rock geothermal resources development, and in particular relates to a method for developing hot dry rock geothermal resources by using gravity drainage. Background technique [0002] Hot dry rock is an emerging clean geothermal resource. It is located 3-10 kilometers underground and has a temperature of 150-650°C. It is an impermeable compact rock mass and is internationally recognized as a high-efficiency, low-carbon and clean energy source. The heat produced by geothermal extraction of hot dry rocks is widely used, and can be used for power generation, heating, and intensified oil extraction measures. In the process of development and utilization, almost no pollutants such as N and S oxides are produced, which is very environmentally friendly. [0003] If a technological breakthrough is achieved, large-scale development and utilization can effectively reduce the impact of the greenhouse effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/30E21B7/04E21B43/20E21B47/00E21B43/267E21B33/13F24T10/20C09K8/66
CPCC09K8/66E21B7/046E21B33/13E21B43/20E21B43/2406E21B43/261E21B43/267E21B43/305E21B47/00F24T10/20Y02E10/10
Inventor 刘佳丽蒋琪李恒宇黄思源周翔于春生
Owner SOUTHWEST PETROLEUM UNIV
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