Carbon dioxide geological sequestration method based on mixed fluid self-detaching

A technology for geological storage and mixing fluids, applied in carbon dioxide storage, earth-moving drilling, storage devices, etc., can solve the problems of particularly high gas source capture requirements, difficult capture costs, and high storage costs, and achieve the requirements for reducing concentration, reducing costs, The effect of increasing early chances

Inactive Publication Date: 2008-06-04
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Above CO 2 Geological storage methods all use very high purity CO 2 gas (e.g. CO 2 Concentration>95%) for geological storage, so the CO 2 The requirements for gas source capture ...

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  • Carbon dioxide geological sequestration method based on mixed fluid self-detaching
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  • Carbon dioxide geological sequestration method based on mixed fluid self-detaching

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and embodiment the present invention is further described:

[0045] This method is for CO 2 The innovation of the geological storage method, some techniques in the traditional method are still applicable to the present invention.

[0046] 1. Regarding site selection and preparation

[0047] The present invention is applicable to CO2 in general deep saline formations 2 Geological storage, especially suitable for geological storage with good trap geological structure, fold structure or inclined stratum conditions. The deep saline strata to be stored have good cap rock (41) or roof, generally shale, mudstone, slate For dense, complete and continuous rock formations with low permeability, the permeability of cap rock (41) is required to be far lower than the permeability coefficient of saline aquifers, and cap rock (41) has a higher air intake value [the air intake value is greater than that through injection wells (10) The pr...

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Abstract

The invention discloses a method of carbon dioxide geological sealing based on the self-detaching of mixed fluid and relates to a method of carbon dioxide geological sealing. The invention comprises the following steps: (1) forming an injection well (10) and an emission well (20) in a selected geological sealing site; (2) injecting the mixed fluid containing CO2 continuously by a high pressure injection device into a geological sealing layer (43) through the injection well (10); (3) releasing the fluid moving to the emission well (20) through the emission well (20); (4) injecting the mixed fluid and releasing the emission well (20) continuously until the concentration of CO2 in the fluid discharged by the emission well (20) is larger than the economic concentration value. The invention is suitable for the field of CO2 geological sealing and for sealing CO2 in a deep brine layer, which is especially suitable for the CO2 geological sealing of the deep brine layer of the structure of inclined formation and dome.

Description

technical field [0001] The present invention relates to a carbon dioxide (CO 2 ) geological storage method, especially related to a CO based on mixed fluid self-separation 2 Geological storage methods, mainly for CO 2 CO in deep brine formations (deep aquifers) 2 Geological storage. Background technique [0002] Currently CO 2 The main types of site geological structures used in geological storage methods are: oil and natural gas reservoirs, deep brine formations (abbreviated as deep aquifers), unminable coal seams, basalt and other geological structures. In each type, CO 2 of geological storage will be CO 2 Compressed and injected into subterranean rock formations. Currently CO 2 The methods used in geological storage are: CO 2 -EOR(CO 2 enhanced oil recovery), CO 2 -ECBM (CO 2 enhanced coalbed methane mining method), CO 2 Natural gas displacement and gas field storage, CO 2 Deep aquifer storage, CO 2 Basalt storage, CO 2 Abandoned mine storage, CO 2 Rock s...

Claims

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Application Information

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IPC IPC(8): B65G5/00
CPCY02C10/14E21B41/0064Y02C20/40
Inventor 李小春魏宁
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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