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日用化学工业（中英文） ›› 2025, Vol. 55 ›› Issue (12): 1526-1533.doi: 10.3969/j.issn.2097-2806.2025.12.004

• 基础研究 • 上一篇    下一篇

CO2溶解气驱动用裂缝性致密油藏基质原油实验研究

刘凯1,2,魏登峰1,2,刘瑛1,2,姚振杰1,2,杨海峰3,杨红1,2,4,*(),周亚楠4   

  1. 1 陕西省CO2封存与提高采收率重点实验室， 陕西 西安 710065
    2 陕西延长石油（集团）有限责任公司研究院， 陕西 西安 710065
    3 陕西延长石油（集团）有限责任公司， 陕西 西安 710065
    4 西北大学 地质学系， 陕西 西安 710000
  • 收稿日期:2025-07-25 修回日期:2025-12-17 出版日期:2025-12-22 发布日期:2026-01-23
  • 基金资助:
    国家重点研发计划“二氧化碳提高油藏采收率与地质封存一体化关键技术及应用示范”(2022YFE0206700);延长石油项目“靖边油田天赐湾中-高含水油藏CO2驱提高采收率技术研究”(YCSY2025YYJC-B-18)

Experimental study on recovering the matrix oil in fractured tight reservoirs by CO2 solution gas drive

Kai Liu1,2,Dengfeng Wei1,2,Ying Liu1,2,Zhenjie Yao1,2,Haifeng Yang3,Hong Yang1,2,4,*(),Yanan Zhou4   

  1. 1 Shaanxi Key Laboratory of CO2 Sequestration and Enhanced Oil Recovery, Xi’an, Shaanxi 710065, China
    2 Research Institute of Shaanxi Yanchang Petroleum（Group）Co., Ltd., Xi’an, Shaanxi 710065, China
    3 Shaanxi Yanchang Petroleum （Group）Co., Ltd., Xi’an, Shaanxi 710065, China
    4 Department of Geology, Northwestern University, Xi’an, Shaanxi 710000, China
  • Received:2025-07-25 Revised:2025-12-17 Online:2025-12-22 Published:2026-01-23
  • Contact: *E-mail: yh_cup2011@sina.com.

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摘要： 致密油藏多压裂投产，为典型的裂缝-基质双重介质油藏，基质原油动用程度决定了最终采收率的高低。CO2驱可通过溶解气驱作用动用基质原油，但CO2在基质原油中的溶解扩散规律及对基质原油的排驱特征仍不明确。该研究开展了基质岩心恒压溶解扩散和吞吐实验、长模型CO2吞吐实验，研究了溶解气驱排驱效率、排驱深度等特征。结果表明：驱替时CO2恒压溶解扩散对基质原油动用能力有限，采收率在11.8%~48%；压力越低、岩心长度越大，效果越差。CO2吞吐可提高采收率30.8%~71.3%，排驱深度大于16 cm；压力越高、岩心长度越大，效果越好。长模型CO2吞吐在基质原油中的排驱深度随吞吐轮次和压力的增大而增大，模型长度75 cm，20 MPa下吞吐7轮次后排驱深度可达60 cm以上。通过对CO2溶解气驱动用裂缝性致密油藏基质原油规律的研究，可以为致密油藏开发方式优选及CO2驱工作制度优化提供一定借鉴。

关键词: 致密油藏, CO2溶解气驱, 基质原油, 排驱特征

Abstract:

Tight oil reservoirs are typically developed through multi-stage fracturing, forming fracture-matrix dual-medium systems where the mobilization efficiency of matrix oil determines the ultimate recovery factor. CO2 flooding can mobilize matrix oil via solution gas drive; however, the dissolution-diffusion behavior of CO2 in matrix oil and its displacement characteristics remain unclear. In this work, constant-pressure dissolution-diffusion experiments and huff-n-puff tests on matrix cores were conducted, along with long-model CO2 huff-n-puff experiments, to investigate the efficiency and drainage depth of solution gas drive. The results indicated that the CO2 dissolution-diffusion under constant pressure during displacement exhibited limited effectiveness in mobilizing matrix oil, with recovery factors in the range of 11.8%-48%; lower pressures and longer core lengths would further reduce the efficiency. In contrast, CO2 huff-n-puff significantly enhanced the recovery by 30.8%-71.3%, with drainage depths exceeding 16 cm; higher pressures and longer core lengths could improve its performance. Additionally, in long-model huff-n-puff tests, the drainage depth within matrix oil increased with the number of cycles and the pressure. Specifically, for a 75 cm model at 20 MPa, the drainage depth exceeded 60 cm after 7 huff-n-puff cycles. Through the research on the mechanisms of CO2 solution gas drive for mobilizing the matrix oil in fractured tight reservoirs, this work could provide some insights for optimizing the development strategies and CO2 flooding operational parameters in such reservoirs.

Key words: tight oil reservoir, CO2 dissolved gas drive, matrix oil, displacement characteristic

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  • TE348