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Method for integration of improvement of geothermal recharge rate and geological storage of CO2

A geological storage, integrated technology, applied in the direction of geothermal energy power generation, heating devices, and other non-combustion heat generation, can solve problems such as poor results

Inactive Publication Date: 2012-04-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Also increase the recharge rate by increasing the pore size of the recharge water filter and improving the well formation process, but the effect is not good

Method used

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  • Method for integration of improvement of geothermal recharge rate and geological storage of CO2
  • Method for integration of improvement of geothermal recharge rate and geological storage of CO2
  • Method for integration of improvement of geothermal recharge rate and geological storage of CO2

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Embodiment 1

[0013] This embodiment is illustrated by taking the formation water of Tianjin Guantao Formation and the sandstone core of Guantao Formation as examples. For 1kg of Guantao Formation water and Guantao Formation sandstone core, by simulating 9.68 mmol, 14.24 mmol, 27.82 mmol, 69.92 mmol and 196.8 mmol of CO 2 Under injection conditions, the reservoir CO 2 - Dissolution of calcareous cement in sandstone reservoirs due to water-rock interaction and its effect on porosity. The results showed that the pH of the sandstone reservoir fluid decreased by 1 unit, HCO 3 - , Ca 2+ , Mg 2+ , Al and Si content all increased ( figure 2 ), which is caused by the dissolution of calcareous cement in an acidic environment, which in turn leads to an increase in the porosity of sandstone reservoirs.

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Abstract

The invention relates to a method for integration of improvement of geothermal recharge rate and geological storage of CO2. In the method, the CO2 in the form of liquid is injected into the sandstone reservoir as a chemical exciting agent, and the penetration rate and the porosity of the sandstone reservoir are improved by reaction of the CO2 and carbonate minerals in the sandstone reservoir. In the method, the purpose of storing partial CO2 can be achieved, and the effects of energy conservation and emission reduction are realized at a certain extent.

Description

technical field [0001] The invention relates to a technology for the development and utilization of geothermal resources, in particular to a method for improving geothermal recharge rate and CO 2 An integrated approach to geological storage. Background technique [0002] As a clean and friendly renewable energy source, geothermal resources are one of the ideal choices for energy conservation and emission reduction. In order to realize the sustainable development and utilization of geothermal resources, the combination of harvesting and irrigation should be adopted in the process of geothermal development. This is very effective and necessary to maintain heat storage pressure, prolong geothermal field life, and prevent environmental damage. At present, the problem of recharge of bedrock thermal storage has been basically solved, but there are still bottlenecks in sandstone thermal storage, such as small recharge volume and serious refilling blockage, which are very unfavora...

Claims

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Application Information

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IPC IPC(8): F24J3/08
CPCY02E10/10
Inventor 庞忠和李义曼杨峰田罗璐黄天明
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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