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Thermodynamic system utilizing geothermal energy of low-temperature exhausted gas reservoir in supercritical CO2 exploitation

A thermal system and supercritical technology, applied in geothermal power generation, fluid extraction, earthwork drilling, etc., can solve the problems of low energy utilization efficiency, lack of high temperature of dry hot rock, etc. The effect of temperature, power consumption saving and water saving

Pending Publication Date: 2022-06-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the existing medium-low temperature depleted gas reservoir has a large heat transfer area and safe geological conditions, but due to the lack of high temperature of dry hot rock, the problem of low energy utilization efficiency, and proposes a method using supercritical CO 2 Thermodynamic system for exploiting geothermal energy in medium and low temperature depleted gas reservoirs

Method used

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  • Thermodynamic system utilizing geothermal energy of low-temperature exhausted gas reservoir in supercritical CO2 exploitation
  • Thermodynamic system utilizing geothermal energy of low-temperature exhausted gas reservoir in supercritical CO2 exploitation
  • Thermodynamic system utilizing geothermal energy of low-temperature exhausted gas reservoir in supercritical CO2 exploitation

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specific Embodiment approach 1

[0023] Embodiment 1: This embodiment uses supercritical CO 2 The thermal system for exploiting geothermal energy from depleted gas reservoirs at medium and low temperature includes: vertical gas injection wells (1) and directional horizontal gas production wells (2) (directional means: drilling along the direction of good reservoir permeability through control of wellbore trajectory);

[0024] The vertical gas injection well (1) is to convert the gas production well corresponding to the reservoir with good storage permeability in the depleted gas reservoir and the gas production well located in the lowermost reservoir of the depleted gas reservoir into the vertical gas injection well (1), for gas injection;

[0025] Reservoir: Reservoir rock layers with certain storage and percolation gas, generally gas reservoirs can have five to seven reservoirs.

[0026] The directional horizontal gas production well (2) is a workover of the gas production well corresponding to the uppermo...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment is different from Embodiment 1 in that the reservoir with good storage permeability in the depleted gas reservoir has a porosity greater than 15% and an average gas permeability greater than 4.5mD.

[0034] Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the length of the main well section of the directional herringbone-shaped lateral horizontal well is greater than 800 meters.

[0036] By establishing the flow model of the coupling between the wellbore and the depleted gas reservoir, it is concluded that the length of the main well section of the directional fishbone-shaped lateral well is not less than 800 meters (the main well section is too long, the construction technology is limited, and the short section cannot reflect the bony branch dominance).

[0037] Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention discloses a thermodynamic system for exploiting geothermal energy of a medium and low temperature exhausted gas reservoir by using supercritical CO2, and relates to the thermodynamic system for exploiting the geothermal energy of the medium and low temperature exhausted gas reservoir. The invention aims to solve the problem that the energy utilization efficiency is low due to the absence of high temperature of hot dry rock although the existing medium and low temperature exhausted gas reservoir is large in heat exchange area and safe in geological condition. The system comprises a vertical gas injection well and a directional horizontal gas recovery well. The vertical gas injection well is used for converting a gas recovery well corresponding to a reservoir with good storage and permeability performance in the depleted gas reservoir and a gas recovery well located in the lowermost reservoir of the depleted gas reservoir into the vertical gas injection well and is used for gas injection; according to the directional horizontal gas recovery well, a gas recovery well corresponding to the uppermost reservoir of the depleted gas reservoir is repaired into the directional horizontal gas recovery well and used for gas recovery; the directional horizontal gas recovery well is a directional fishbone-shaped branch horizontal well; the directional fishbone-shaped branch horizontal well comprises a main well section and a branch well section. The invention is used in the field of geothermal energy utilization.

Description

technical field [0001] The invention relates to the field of high-efficiency utilization of geothermal energy, and is a kind of utilization of supercritical CO 2 A thermal system for mining geothermal energy from depleted gas reservoirs at medium and low temperatures. Background technique [0002] As a kind of renewable energy, geothermal resource has the advantages of abundant reserves, strong stability, good continuity and high utilization coefficient. It is a practical and competitive clean energy. [0003] In 2021, my country's geothermal heating area has exceeded 500 million square meters, ranking first in the world. However, at present, the exploration and drilling costs are high and the investment risk is high when extracting geothermal energy. Moreover, when water is used as the heat-carrying mass for extracting heat energy, when drilling hot water geothermal wells, the water output of a single well is often seriously lower than expected, and the heat exchange effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16
CPCE21B43/164Y02E10/10
Inventor 谭羽非董铭李卓阳张甜甜
Owner HARBIN INST OF TECH
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