首页|Experimental study of the effects of a multistage pore-throat structure on the seepage characteristics of sandstones in the Beibuwan Basin:Insights into the flooding mode

Experimental study of the effects of a multistage pore-throat structure on the seepage characteristics of sandstones in the Beibuwan Basin:Insights into the flooding mode

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To investigate the relationship between grain sizes,seepage capacity,and oil-displacement efficiency in the Liushagang Formation of the Beibuwan Basin,this study identifies the multistage pore-throat structure as a crucial factor through a comparison of oil displacement in microscopic pore-throat ex-periments.The two-phase flow evaluation method based on the Li-Horne model is utilized to effectively characterize and quantify the seepage characteristics of different reservoirs,closely relating them to the distribution of microscopic pores and throats.It is observed that conglomerate sandstones at different stages exhibit significant heterogeneity and noticeable differences in seepage capacity,highlighting the crucial role played by certain large pore throats in determining seepage capacity and oil displacement efficiency.Furthermore,it was found that the displacement effects of conglomeratic sandstones with strong heterogeneity were inferior to those of conventional homogeneous sandstone,as evidenced by multiple displacement experiments conducted on core samples with varying granularities and flooding systems.Subsequently,core-based experiments on associated gas flooding after water flooding were conducted to address the challenge of achieving satisfactory results in a single displacement mode for reservoirs with significant heterogeneity.The results indicate that the oil recovery rates for associated gas flooding after water flooding increased by 7.3％-16.4％compared with water flooding alone at a gas-oil ratio of approximately 7000 m3/m3.Therefore,considering the advantages of gas flooding in terms of seepage capacity,oil exchange ratio,and the potential for two-phase production,gas flooding is recommended as an energy supplement mode for homogeneous reservoirs in the presence of sufficient gas source and appropriate tectonic angle.On the other hand,associated gas flooding after water flooding is suggested to achieve a more favorable development effect compared to a single mode of energy supplementation for strongly heterogeneous sandstone reservoirs.

Beibuwan BasinMultistage pore-throat structureMultistage seepage characteristicsMicroscopic visualizationHeterogeneityGas/water floodingFlooding mode

Lei Wang、Xiao Lei、Qiao-Liang Zhang、Guang-Qing Yao、Bo Sui、Xiao-Jun Chen、Ming-Wei Wang、Zhen-Yu Zhou、Pan-Rong Wang、Xiao-Dong Peng

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Zhanjiang Branch,China National Offshore Oil Corporation(CNOOC)Limited,Zhanjiang,524057,Guangdong,China

Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan,430074,Hubei,China

School of Resources and Safety Engineering,Chongqing University,Chongqing,400044,China

School of Engineering,University of Manchester,Manchester M13 9WJ,UK

Hainan Branch,China National Offshore Oil Corporation(CNOOC)Limited,Haikou,570311,Hainan,China

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Major Science and Technology Project of CNOOC Co.,Ltd.of ChinaMajor Science and Technology Project of CNOOC Co.,Ltd.of China国家自然科学基金中国博士后科学基金中国博士后科学基金Postdoctoral Innovation science Foundation of Hubei Province of ChinaScientific Research Project of Zhanjiang Branch of CNOOC国家留学基金委项目

CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJKJGG2021-0505420021712020TQ02992020M682520ZYKY-2022-ZJ-02

2024

10.1016/j.petsci.2023.12.018

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(2)
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