气藏注CO2提高采收率及封存评价方法研究进展
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TE37

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国家自然科学基金联合基金重点项目(U23A2022);


Gas Reservoir CO2 Injection for Enhanced Recovery and Sequestration Evaluation Methods Research Progress
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    摘要:

    CO2利用与封存是CCUS的两个重要环节,其中CO2-EGR技术对于实现绿色碳减排与天然气增产的双重目标具有巨大的发展潜力。本文梳理了CO2提高天然气采收率及封存机理、CO2提高天然气采收率及封存的潜力与评价方法。结果表明:CO2提高天然气采收率机理主要为:物性差异、竞争吸附及筛滤置换作用、连续对流排驱作用、恢复气藏压力与抑制水侵作用以及储层溶蚀改造作用;CO2气藏封存机理包括构造封存、残余气封存、溶解封存以及矿化封存;CO2提高天然气采收率评价方法有数值模拟评价、理论评价、物理实验评价;气藏CO2封存评价方法为包括有效容积法、物质平衡法、数值模拟评价、理论评价等;尽管CO2提高天然气藏采收率及封存评价方法已初步建立,但适用范围仍较小,需要结合我国天然气藏地质特征进一步完善,提高封存评价准确性。

    Abstract:

    CO2-EGR technology, as a critical element within the framework of CCUS (CO2 capture, utilization, and storage), is recognized for its substantial potential in accomplishing the dual objectives of reducing carbon emissions and augmenting natural gas production. The mechanisms through which CO2 enhances natural gas recovery and storage are comprehensively outlined in this study, along with an examination of the associated potential and evaluation methodologies.Key findings indicate that CO2 improves natural gas recovery rates through mechanisms such as physical property differences, competitive adsorption, screening displacement, continuous convection displacement, restoration of gas reservoir pressure, and inhibition of water invasion. Additionally, the sealing mechanisms of CO2 in gas reservoirs encompass structural sealing, residual gas sealing, dissolution sealing, and mineralization sealing.The evaluation methods for CO2-enhanced natural gas recovery rates include numerical simulation, theoretical analysis, and physical experiments. Similarly, methods for assessing CO2 storage in gas reservoirs involve the effective volume method, material balance method, numerical simulation, and theoretical evaluation.While the potential of CO2 to enhance natural gas recovery is established, and preliminary evaluation methods are outlined, current applicability remains limited. Further refinement is deemed essential, particularly in consideration of the geological characteristics of natural gas reservoirs in China, to enhance the accuracy of storage assessments. Continuous research efforts are acknowledged as imperative to broaden the scope of application and optimize evaluation methodologies within this field.

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曹成,陈星宇,张烈辉,等. 气藏注CO2提高采收率及封存评价方法研究进展[J]. 科学技术与工程, 2024, 24(18): 7463-7475.
Cao Cheng, Chen Xingyu, Zhang Liehui, et al. Gas Reservoir CO2 Injection for Enhanced Recovery and Sequestration Evaluation Methods Research Progress[J]. Science Technology and Engineering,2024,24(18):7463-7475.

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  • 收稿日期:2023-12-20
  • 最后修改日期:2024-04-19
  • 录用日期:2024-03-21
  • 在线发布日期: 2024-07-05
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