CO2作垫层气的枯竭气藏型储气库混气实验研究

doi:10.11885/j.issn.1674-5086.2024.05.24.01

西南石油大学学报(自然科学版) ›› 2026, Vol. 48 ›› Issue (2): 90-97.DOI: 10.11885/j.issn.1674-5086.2024.05.24.01

CO₂作垫层气的枯竭气藏型储气库混气实验研究

胡书勇¹, 杨小辰¹, 邓熠², 郑兴明³

1. 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川成都 610500;
2. 润智科技有限公司, 广东中山 528400;
3. 中国石化重庆涪陵页岩气勘探开发有限公司, 重庆涪陵 408000

收稿日期:2024-05-24 发布日期:2026-04-30
通讯作者: 胡书勇，E-mail:hushuyong@swpu.edu.cn
作者简介:胡书勇，1973年生，男，汉族，四川南充人，教授，博士，主要从事油气田开发、地下储气库方面的研究。E-mail:hushuyong@swpu.edu.cn
杨小辰，1997年生，男，满族，辽宁丹东人，硕士，主要从事油气田开发、地下储气库方面的研究。Email:1051390320@qq.com
邓熠，1993年生，男，汉族，黑龙江大庆人，硕士，主要从事油气田开发、地下储气库方面的研究。Email:dengyi0226@126.com
郑兴明，1985年生，男，汉族，四川自贡人，高级工程师，主要从事页岩气开发管理工作。E-mail:724257623@qq.com
基金资助:
新型油气勘探开发国家科技重大专项（2025ZD1406800）

An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO₂ as Cushion Gas

HU Shuyong¹, YANG Xiaochen¹, DENG Yi², ZHENG Xingming³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Runzhi Technology Co. Ltd., Zhongshan, Guangdong 528400, China;
3. Chongqing Fuling Shale Gas Exploration and Development Co. Ltd., SINOPEC, Fuling, Chongqing 408000, China

Received:2024-05-24 Published:2026-04-30

摘要/Abstract

摘要： CO₂作为地下储气库的垫层气，可以维持储气库内压力的稳定，阻止工作气从边底部的逸散，防止边、底水入侵，为采气提供动力。但注入的CO₂会与天然气混合，由于储气库强注强采的特性，会引起CO₂和CH₄混合带的波动进而影响采出气体的纯度。开展了填砂容器混气实验、CH₄和CO₂多次注采实验，研究了CO₂与天然气的混气特征及不同的工作周期、工作制度对混合带的影响，最后结合数值模拟结果与室内实验相互论证。实验结果表明：同一生产制度下，随着注采周期的增加，取样气中CO₂的摩尔分数也逐渐增加，但是增加的幅度很小，混合带缓慢上移；取样气中CO₂的摩尔分数随着采气速度的增加而降低，采气速度会对混合带的发展产生影响，但影响程度不大。

关键词: 垫层气, 混气, 混合带, 多次注采实验, 采气速度

Abstract: When used as the cushion gas of underground gas storage, CO₂ can maintain the stability of pressure inside the gas storage, prevent working gas from escaping from the bottom edge, prevent edge and bottom water from invading, and provide power for gas production. However, the injected CO₂ will mix with natural gas, and the strong injection and production in the gas reservoir may cause the fluctuation of CO₂ and CH₄ mixing zone, thus affecting the purity of produced gas. In this paper, mixed gas experiment of sand filling vessel and multiple injection and production experiment of CH₄ and CO₂ were carried out to study the mixed gas characteristics of CO₂ and natural gas as well as the influence of different working cycle and working system on the mixed zone. The numerical simulation results were tested with laboratory experiment results. The experimental results show that under the same production system, with the increase of injection-production cycle, the mole fraction of CO₂ in the sampling gas also increases gradually at very small scale and the mixing zone moves up slowly. The mole fraction of CO₂ in the sample gas decreases with the increase of the gas production rate. The gas production rate will have an impact on the development of the mixing zone, but the impact is not significant.

Key words: cushion gas, gas mixture, mixed zone, multiple injection and production experiment, gas velocity

中图分类号:

胡书勇, 杨小辰, 邓熠, 郑兴明. CO₂作垫层气的枯竭气藏型储气库混气实验研究[J]. 西南石油大学学报(自然科学版), 2026, 48(2): 90-97.

HU Shuyong, YANG Xiaochen, DENG Yi, ZHENG Xingming. An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO₂ as Cushion Gas[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(2): 90-97.

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CO₂作垫层气的枯竭气藏型储气库混气实验研究

An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO₂ as Cushion Gas

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