A variable working condition produced gas carbon dioxide capture system and process method

By using a variable-condition produced gas carbon dioxide capture system that combines pressure swing adsorption and membrane separation technologies and employs a special carbon molecular sieve membrane, the problem of CO2 concentration and volume changes during oilfield extraction has been solved, achieving efficient and energy-saving CO2 capture, and is suitable for small-scale carbon source capture.

CN119098020BActive Publication Date: 2025-11-07PETROCHINA CO LTD
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Patent Information

Application Number
CN202310664823.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-07
Publication Date
2025-11-07
Estimated Expiration
2043-06-07

AI Technical Summary

Technical Problem

During the oilfield extraction process, the content of associated gas and the concentration of CO2 change with the extraction time. Existing technologies cannot effectively solve the problem of capturing different amounts of associated gas and CO2 concentrations, resulting in high energy consumption, complex processes, and unsuitability for small-scale carbon source capture.

Method used

A variable operating condition produced gas carbon dioxide capture system is adopted, which combines a secondary capture method of pressure swing adsorption and membrane separation with a combustor, and uses a carbon molecular sieve membrane prepared with carboxylated polyimide with special properties to realize the development of the CCUS industry chain through equipment coupling.

Benefits of technology

It achieves efficient CO2 capture at different concentrations and volumes, reduces equipment maintenance, simplifies the process, saves energy and reduces carbon emissions, is suitable for small-scale carbon source capture, and improves separation efficiency and environmental benefits.

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Abstract

The present application belongs to the technical field of ground engineering CCUS, and particularly relates to a variable working condition produced gas carbon dioxide capture system and process method. The capture system comprises an oilfield associated gas source outlet, a pressure swing adsorption compressor, a first-stage pressure swing adsorption unit, a second-stage pressure swing adsorption unit, a membrane separation unit and a vacuum pump. The preparation method comprises the following steps: first, carrying out first-stage pressure swing adsorption on the CO2-containing mixed gas; then, carrying out second-stage pressure swing adsorption; finally, carrying out membrane separation to obtain a gas with a carbon dioxide purity of ≥95%. The present application adopts a variable working condition produced gas carbon dioxide capture membrane and PSA coupling process method, mainly solves the problems that the CO2 concentration and gas volume in associated gas are changing, has strong applicability, at the same time, the front stage adopts a pressure swing adsorption device, which can reduce the maintenance amount of the membrane, and the series-parallel connection can also adapt to the change of gas volume. The present application reduces the purification process, realizes technical coupling, saves energy and reduces carbon, and achieves the purpose of green development.
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Citation Information

Patent Citations

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  • Methods and systems of enhanced carbon dioxide recovery

    US20160001219A1