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Leakage-proofing process for exploiting hot-dry-rock geothermal resource by injecting CO2 (supercritical carbon dioxide)

A supercritical, dry hot rock technology, applied in the field of leakage prevention, can solve problems such as safety hazards

Inactive Publication Date: 2015-06-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But from the perspective of sequestration, CO 2 Leakage into the surrounding rock is a great safety hazard

Method used

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  • Leakage-proofing process for exploiting hot-dry-rock geothermal resource by injecting CO2 (supercritical carbon dioxide)
  • Leakage-proofing process for exploiting hot-dry-rock geothermal resource by injecting CO2 (supercritical carbon dioxide)
  • Leakage-proofing process for exploiting hot-dry-rock geothermal resource by injecting CO2 (supercritical carbon dioxide)

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with accompanying drawing.

[0041] inject supercritical CO 2 The leakage prevention technology for exploiting hot dry rock geothermal heat, the specific steps are as follows:

[0042] (1) Through preliminary geological exploration, select a suitable location for the hot dry rock reservoir, and drill the injection well 31;

[0043] (2) Using injection pumps 18 and 19, the water-based fracturing fluid and proppant in the storage tanks 21 and 20 are injected into the hot dry rock reservoir 3 with a large displacement through the wellhead device 28 of the injection well 31, and the Hydraulic fracturing, construction of artificial geothermal reservoirs, a well needs to inject about 10000m 3 For water, the radius of the artificial heat storage is 500-1000m, and the thickness is 500-1000m.

[0044] (3) A production well is drilled on both sides of the injection well 31, and the production wells 4 and 32 p...

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Abstract

The invention relates to the field of geothermal exploitation and provides a leakage-proofing process for exploiting a hot-dry-rock geothermal resource by injecting CO2 ( supercritical carbon dioxide). According to the leakage-proofing process, four inorganic salt precipitation generating mechanisms including (1) mixing a high-concentration salt solution with a precipitation inducer; (2) mixing a high-concentration inorganic salt solution with weak-acid / weak-base gas; (3) mixing a high-concentration inorganic salt solution with another high-concentration inorganic salt solution; (4) evaporating and carrying residual stratum water in surrounding rocks by the supercritical CO2 when the supercritical CO2 flows are adopted, the supercritical CO2 is injected into front slugs / rear slugs of a hot-dry-rock reservoir stratum alternatively, the slugs are displaced by the supercritical CO2 till to the position close to surrounding rocks in a leaking area, the solutions in the slugs are mixed to generate certain physical-chemical reactions so as to generate precipitation, and the generated precipitation is used to block off rock pore cracks. By the aid of combination of evaporating and carrying functions of the supercritical CO2, the rock pore cracks are further blocked off by the precipitation. The leakage-proofing process for exploiting the hot-dry-rock geothermal resource by injecting the supercritical CO2 is good in effect after being verified by experiments.

Description

technical field [0001] The invention relates to the field of geothermal development, in particular to a supercritical CO injection 2 The invention discloses a technological method for preventing leakage of hot dry rock geothermal energy. Background technique [0002] Geothermal is a clean and renewable energy with abundant reserves. However, fossil fuels such as coal and petroleum are still the main components of the world's energy consumption structure. CO 2 Resource utilization and geological storage technology are considered to be an effective measure to reduce greenhouse gas emissions and mitigate climate warming. will CO 2 The idea of ​​resource utilization is applied to geothermal development, that is, the use of supercritical CO 2 Replacing conventional water as the working medium, carrying geothermal heat or displacing underground hot water is a novel geothermal development technology that has attracted widespread attention. In 2000, Brown first proposed the use ...

Claims

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Application Information

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IPC IPC(8): E21B33/138F24J3/08
CPCE21B33/138F24T10/30Y02E10/10
Inventor 张亮崔国栋李欣任韶然
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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