Determination of relative permeability curve under combined effect of polymer and surfactant

Zhang, Wenlong; Hou, Jian; Liu, Yongge; Zhou, Kang; Li, Zhenquan; Du, Qiangguo

doi:10.1016/j.petrol.2022.110588

Cited by 2 publications

(1 citation statement)

References 38 publications

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“…Recovery rate prediction has always posed a challenge to oil fields. Current recovery prediction techniques include relative permeability curves − and core analysis methods − that traditionally predict recovery rates from the reservoir to core scale. However, few studies have focused on the prediction of the relative change of oil phase occupancy ( RCPOC ) specifically in the pore space on a pore scale.…”

Section: Introductionmentioning

confidence: 99%

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning

Zhang,

Lin,

Ren

2023

Energy Fuels

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Carbon dioxide (CO 2 ) enhanced oil recovery (EOR) is an important technology to achieve carbon neutrality by sequestering CO 2 underground while simultaneously recovering crude oil. Reservoir pore structure is a key factor influencing CO 2 EOR. In this study, we utilized advanced online in situ CT scanning and digital rock techniques to obtain, for the first time, evolution profiles of the finger area during water flooding and CO 2 flooding processes, quantitatively assessing the differences in fluid patterns. Additionally, we first introduced an innovative approach using advanced machine learning techniques, especially XGBoost and SHAP, to construct a predictive model of the relative change of oil phase occupancy (RCPOC) based on pore structure parameters and evaluated the importance of each pore structure parameter. Importantly, our results revealed that CO 2 can significantly increase the sweep efficiency area while substantially reducing residual oil saturation, in stark contrast to the relatively uniform water front observed during water flooding. Furthermore, we elucidated the critical role of capillary forces, demonstrating that water flooding primarily extracts trapped oil from small pores, while CO 2 flooding effectively extracts oil from larger pores. During CO 2 flooding, there is a positive correlation between coordination number, mean throat radius (MeanTR), and mean throat length (MeanTL) and the change in oil occupancy, whereas their influence during water flooding is limited. In summary, this study contributes to the understanding of flow patterns and pore structure effects on residual oil during water flooding and the CO 2 flooding processes. It also provides a novel approach based on pore structure parameters to predict RCPOC and assess the importance of influencing factors, thereby expanding our research perspective on this issue.

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Section: Introductionmentioning

confidence: 99%

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning

Zhang,

Lin,

Ren

2023

Energy Fuels

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Study on the influence of steam state on seepage, production, migration and deposition of offshore heavy oilfields

Zhang,

Chen,

Zheng

et al. 2024

Energy

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Determination of relative permeability curve under combined effect of polymer and surfactant

Cited by 2 publications

References 38 publications

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning

Study on the influence of steam state on seepage, production, migration and deposition of offshore heavy oilfields

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Determination of relative permeability curve under combined effect of polymer and surfactant

Cited by 2 publications

References 38 publications

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO2 Flooding: In Situ CT Scanning

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO2 Flooding: In Situ CT Scanning

Study on the influence of steam state on seepage, production, migration and deposition of offshore heavy oilfields

Contact Info

Product

Resources

About

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning

Flow Patterns and Pore Structure Effects on Residual Oil during Water and CO₂ Flooding: In Situ CT Scanning