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Fractured heat storage geothermal development method for Cambrian Karst heat storage and metamorphic rock strata

A Cambrian, metamorphic rock technology, applied in the field of geothermal resource development, can solve the problems of low outlet temperature, low reservoir temperature, poor economic benefit of single-well heating, etc., and achieve high outlet temperature, large heating area, and recharge effect. Good results

Active Publication Date: 2021-06-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems that the reservoir temperature is low, the outlet temperature is low, the economic benefit of single well heating is poor, and the domestic water consumption of residents is affected, and 100% recharge has not been realized in the process of developing geothermal heat. Cambrian Karst Heat Storage and Metamorphic Rock Formation Fractured Heat Storage Geothermal Development Method

Method used

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  • Fractured heat storage geothermal development method for Cambrian Karst heat storage and metamorphic rock strata
  • Fractured heat storage geothermal development method for Cambrian Karst heat storage and metamorphic rock strata
  • Fractured heat storage geothermal development method for Cambrian Karst heat storage and metamorphic rock strata

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Embodiment 1

[0029] Such as figure 1 , figure 2 and Figure 7 As shown, in this embodiment, a method for the development of geothermal heat storage of medium-deep Cambrian karst heat storage, according to the relevant hydrological and geological exploration data, is within the range S of the affected area from the faulted structural zone 4, where L≤S≤10km, L is the vertical distance between the production well closest to the fault structure zone and the fault structure zone on the horizontal plane, constructing several geothermal production wells 1 (such as figure 1 The solid circles 1a, 1b, 1c, 1d, etc.) and the reinjection well 2 to the Cambrian karst formation 3a, and the bottom of the well is located in the same elevation range of the Cambrian karst thermal reservoir. The production well 1 and the reinjection well 2 are arranged linearly and sequentially along the hanging wall of the fault structural zone, for example, 1b, 2, and 1d are production wells, reinjection wells, and produ...

Embodiment 2

[0033] Such as image 3 , 4 As shown in and 7, a middle-deep Cambrian karst heat storage and geothermal resources development method in this embodiment, according to relevant hydrological and geological exploration data, is within the range S of the affected area from the faulted structural zone 4, where L≤S≤ 10km, L is the vertical distance between the production well closest to the fault structure zone and the fault structure zone on the horizontal plane, constructing several geothermal production wells 1 (such as image 3 The solid circles 1a, 1b, 1c, 1d, 1e, 1f, etc.) and the reinjection well 2 (such as image 3 Hollow dots 2a, 2b, etc.) to the Cambrian karst formation 3a, and the well bottom is located in the same elevation range of the Cambrian karst thermal reservoir. The production well 1 and the reinjection well 2 are linearly arranged sequentially along the hanging wall of the fault structural zone, for example, 1c, 2a, 2b, and 1e are production wells, reinjection ...

Embodiment 3

[0036] Such as Figure 5 , 6 As shown in and 7, a deep metamorphic rock stratum fracture type heat storage geothermal resource development method in this embodiment, according to relevant hydrological and geological exploration data, is within the range S of the affected area from the faulted structural zone 4, where L≤S≤ 10km, L is the vertical distance between the production well closest to the fault structure zone and the fault structure zone on the horizontal plane, constructing several geothermal production wells 1 (such as Figure 5The solid circles 1a, 1b, 1c, 1d, etc.) and the reinjection well 2 to the deep metamorphic rock fractured formation 3b, the reinjection well is 100m or more deeper than the production well, and the reinjection well and the production well pass through the metamorphic rock formation. The fracture system is connected with the fault structural zone 4. The production well 1 and the reinjection well 2 are arranged linearly and sequentially along ...

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Abstract

The invention discloses a fractured heat storage geothermal development method for Cambrian Karst heat storage and metamorphic rock strata. The technical problems that in the geothermal development process at present, the shallow karst heat storage and collection temperature is low, domestic water of residents is affected, and 100% recharge is not achieved are mainly solved. The method comprises the specific steps that (1) within a certain range from a fracture tectonic zone, a geothermal exploitation well and a recharge well are constructed to a deep Cambrian karst stratum section or a metamorphic rock fractured stratum section; (2) the exploitation well and the recharge well are subjected to whole well cementation on a stratum above the Cambrian Karst stratum or the metamorphic rock fractured stratum and the upper section of a local stratum, and well cementation is conducted through an open hole or a floral tube below the well cementation section; (3) when the exploitation well and the recharge well penetrate through the Ordovician system and other water-rich stratums, wellbore heat preservation is conducted; and (4) hot fluid in the exploitation well is extracted through a lift pump, and after heat exchange, geothermal tail water is pressurized and recharged through the recharge well. The method has the advantages of high outlet temperature, large single well heating area, good recharge effect, zero influence on shallow domestic water and the like.

Description

technical field [0001] The invention belongs to the technical field of geothermal resources development, and in particular relates to a geothermal development method for Cambrian karst heat storage and metamorphic rock stratum fracture type heat storage. Background technique [0002] At present, China's geothermal resources are huge and widely distributed. Among them, mid-deep geothermal has become the main energy source for clean heating in winter due to its high temperature, large-scale clean heating, and stability and reliability. Middle-deep geothermal reservoirs are mainly karst formations and metamorphic rock formations. For example, the geothermal development in Taiyuan, Shanxi is mainly for the upper Ordovician karst geothermal water. 3 / h, the outlet temperature is 50-70°C. However, the Ordovician aquifer is the main source of domestic water and landscape spring water in this area, and geothermal development has a certain impact on it. At the same time, the reser...

Claims

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Application Information

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IPC IPC(8): F24T10/20F28D20/00E21B43/30E21B17/00
CPCF24T10/20F28D20/0052E21B43/30E21B17/00Y02E60/14Y02E70/30Y02E10/10
Inventor 冯子军徐晓鹏董文强赵鹏杜赓阴伟涛靳佩桦赵阳升
Owner TAIYUAN UNIV OF TECH
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