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0 20251013

DOI: https://doi.org/10.11698/PED.20250079

古龙页岩油注CO2吞吐扩散传质规律及原油动用机制

  • 韩啸 ,
  • 宋兆杰 ,
  • 邓森 ,
  • 鲜成钢 ,
  • 李斌会 ,
  • 李培宇 ,
  • 宋宜磊 ,
  • 姜佳彤 ,
  • 吕柄辰 ,
  • 张利超
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  • 1.中国石油大学（北京）油气资源与工程全国重点实验室,北京 102249;
    2.多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆 163712;
    3.中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆 163712;
    4.黑龙江省油层物理与渗学重点实验室,黑龙江大庆 163712;
    5.中国石油大学（北京）克拉玛依校区石油学院,新疆克拉玛依 834000
韩啸（1995-）,男,河北衡水人,中国石油大学（北京）非常规油气科学技术研究院在读博士,主要从事非常规油气相态和提高采收率技术研究。地址：北京市昌平区府学路18号,中国石油大学（北京）,邮政编码：102249。E-mail：hanx202211@163.com

收稿日期: 2025-02-14

  修回日期: 2025-08-29

  网络出版日期: 2025-09-16

基金资助

国家自然科学基金项目“页岩油储层纳微米孔喉中油-CO2-水多元体系相行为与流动机制研究”（520743198）; 黑龙江省“揭榜挂帅”科技攻关项目“古龙页岩油提高采收率关键问题研究”（DQYT-2022-JS-761）

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Diffusion, mass transfer and oil mobilization mechanisms of CO2 huff-n-puff in Gulong shale oil reservoir

  • HAN Xiao ,
  • SONG Zhaojie ,
  • DENG Sen ,
  • XIAN Chenggang ,
  • LI Binhui ,
  • LI Peiyu ,
  • SONG Yilei ,
  • JIANG Jiatong ,
  • LYU Bingchen ,
  • ZHANG Lichao
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  • 1. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249;
    2. State Key Laboratory of Continental Shale Oil, Daqing 163712;
    3. Exploration and Development Research Institute, Daqing Oilfield Limited Company, Daqing 163712;
    4. Heilongjiang Provincial Key Laboratory of Reservoir Physics & Fluid Mechanics in Porous Medium, Daqing 163712;
    5. School of Petroleum, China University of Petroleum (Beijing) at Karamay, Karamay 834000

Received date: 2025-02-14

  Revised date: 2025-08-29

  Online published: 2025-09-16

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摘要

针对纯页岩型页岩油储层注CO2吞吐过程中原油-CO2作用机制及原油动用规律尚不清晰的问题,开展古龙页岩油注CO2吞吐在线核磁共振实验,构建CO2动态扩散系数计算模型,揭示古龙页岩油储层注CO2吞吐原油流动机理和原油动用影响因素,阐明CO2在页岩内的扩散传质规律。结果表明：①注入阶段,CO2侵入注入端附近的大孔隙,将部分原油驱至岩心深部的小孔隙;焖井阶段,原油向注入端附近的大孔隙回流,在岩心内部重新分布;排采阶段,原油动用区域逐渐由采出端面（注入端面）向岩心深部扩展。排采结束后,采出原油中大、小孔隙的贡献比例约为8∶3。②焖井阶段CO2在页岩多孔介质内的扩散系数随扩散前缘推进逐渐降低。岩心孔渗物性越好,扩散前缘CO2浓度越高,CO2扩散系数越大,扩散递减速率越慢。③增加注CO2吞吐轮次可以有效提高洗油效率,但对原油动用范围影响不明显。纹层不发育的小层注CO2吞吐后小孔隙内原油难以动用,采出程度仅为12.72%;纹层发育的小层注CO2吞吐后大、小孔隙内原油均可动用,采出程度可达39.11%。

关键词： 古龙页岩油; 注CO2吞吐; CO2扩散传质; 扩散系数; 原油动用机制

本文引用格式

韩啸 , 宋兆杰 , 邓森 , 鲜成钢 , 李斌会 , 李培宇 , 宋宜磊 , 姜佳彤 , 吕柄辰 , 张利超 . 古龙页岩油注CO2吞吐扩散传质规律及原油动用机制[J]. 石油勘探与开发, 0 : 20251013 . DOI: 10.11698/PED.20250079

Abstract

To reveal the complex crude oil-CO2 interaction mechanism and oil mobilization behavior during CO2 huff-n-puff in shale-type shale oil reservoirs, CO2 huff-n-puff experiments with on-line nuclear magnetic resonance monitoring were conducted on Gulong shale cores, combined with the prediction model of CO2 dynamic diffusion coefficient, the flow mechanism and factors influencing oil mobilization during CO2 huff and puff in Gulong shale oil reservoir is studied, and the diffusion and mass transfer behavior of CO2 is investigated in shale. The results show that at the injection stage, CO2 invades into macropores near the injection end, and drives part of the crude oil to small pores in the deep part of the core. At the shut-in stage, the crude oil gradually reflows to macropores near the injection end and is redistributed in the core. At the production stage, the oil mobilization zone is gradually expanded from the production end (injection end) to the deep part of the core. The contribution ratio of produced oil from large and small pores is about 8:3 after production. The diffusion coefficient of CO2 in shale porous media gradually decreases with the advance of diffusion front at shut-in stage. The better the porosity and permeability of core samples, the higher the CO2 concentration at diffusion front, the greater the CO2 diffusion coefficient, and the slower the diffusion decline rate is. Increasing the huff and puff cycles could effectively enhance oil displacement efficiency, though its impact on the crude oil mobilization zone remains insignificant. The crude oil in small pores of the small layer with undeveloped laminae is difficult to be produced during CO2 huff and puff, and the oil recovery is only 12.72 %. The crude oil in macro- and small pores of the small layer with developed laminae can be effectively mobilized during CO2 huff and puff, and the oil recovery can reach 39.11%.

Key words： Gulong shale oil; CO2 huff and puff; CO2 diffusion and mass transfer; diffusion coefficient; oil mobilization mechanism

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