Characteristics of imbibition in tight oil reservoirs from the perspective of physical experiments and theory

Cao, Renyi; Wu, Zhiyu; Liu, Xiaowei; Cheng, Linsong; Xu, Zhongyi; Guan, Yun; Guo, Zhuoliang; Jia, Zhihao

doi:10.1002/ese3.762

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…The presence of nanopores in tight sandstones has also been captured in NMR analysis. 16 Lyu et al 27 also revealed 10 nm pores in their study.…”

Section: Methodsmentioning

confidence: 68%

“…This confirms the observations in earlier studies that sandstone samples can contain pore sizes as small as nanometers. The presence of nanopores in tight sandstones has also been captured in NMR analysis . Lyu et al .…”

Section: Resultsmentioning

confidence: 99%

“…Other studies on boundary conditions give more consideration to capillary imbibition than diffusion imbibition 10,15 and only a few studies have mentioned the influence of other forces such as diffusion, osmosis, or surface hydration. 8,16 A low flowback rate suggests that the overall imbibition process may also be greatly influenced by diffusion imbibition, which is slower because capillary imbibition mainly occurs at the early stage of the imbibition process while diffusion takes over as capillary forces decrease at the later stage of the imbibition process. The contribution of both capillary and diffusion imbibition mechanisms has not been simultaneously explored under different boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of boundary conditions on spontaneous imbibition in oil saturated sandstones was investigated by Lyu et al They observed the highest imbibition recovery rate in samples subjected to all-face-open (AFO) boundary conditions. Other studies on boundary conditions give more consideration to capillary imbibition than diffusion imbibition , and only a few studies have mentioned the influence of other forces such as diffusion, osmosis, or surface hydration. , …”

Section: Introductionmentioning

confidence: 99%

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NMR Investigation of Brine Imbibition Dynamics in Pores of Tight Sandstones under Different Boundary Conditions

Umeobi

et al. 2021

Energy Fuels

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This study explores imbibition dynamics and flowback of fracturing fluids in Penglaizhen sandstones by imbibition experiment and nuclear magnetic resonance analysis. A gas–water system was considered and samples were subjected to different boundary conditions and fully immersed in the wetting phase for imbibition. A close range of the pore radius was observed between 0.1 nm and 9.3 μm for all samples. Basic features of the imbibition phases were represented by the imbibition profile, and imbibition parameters were quantified in terms of gas recovery, imbibition capacity, imbibition index and pore connectivity, diffusion ability, and imbibition potential under the respective boundary conditions. The study reveals that capillary imbibition (mainly in all-face-open (AFO) and two-end-closed (TEC)) and diffusion imbibition (mainly in two-end-open (TEO) and one-end-open (OEO)) are the major mechanisms by which fracture fluids flow into the formation matrix. There is high gas recovery in all samples (>79%), which can be attributed to the high water-wet nature of the samples, while the residual gas saturation is very low with the highest value in OEO at 0.17 and the lowest in AFO at 0.01. The strong capillary force in AFO and TEC boundary conditions is the key factor for higher gas recovery than TEO and OEO samples. However, the low diffusion ability of AFO and TEC samples depict a low gas displacement effect. On the other hand, TEO and OEO boundary conditions show an increased gas displacement effect through increased diffusion ability. The imbibition index (which represents pore connection) and imbibition potential from the highest to the lowest also correspond to the diffusion ability from the highest to the lowest.

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“…The presence of nanopores in tight sandstones has also been captured in NMR analysis. 16 Lyu et al 27 also revealed 10 nm pores in their study.…”

Section: Methodsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

NMR Investigation of Brine Imbibition Dynamics in Pores of Tight Sandstones under Different Boundary Conditions

Umeobi

et al. 2021

Energy Fuels

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Study on the microscopic percolation mechanism of different aqueous media huff‐n‐puff with cores in Fengxi tight oil reservoirs of Qinghai Oilfield

Dou,

Yang,

et al. 2024

Energy Science & Engineering

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Huff‐n‐puff (HnF) is a crucial technology for effectively enhancing the oil recovery (EOR) of tight oil reservoirs. Soaking period is the primary platform for injection medium interacting with formation fluid and reservoir rock in HnF. Elucidating the micro‐percolation mechanism of the soaking period is immensely significant for guiding oilfield production practices. The present study established a physical simulation method combining HnF experiments with nuclear magnetic resonance to reveal the microscopic percolation mechanisms, including water, fracturing fluid, and surfactant. Furthermore, the impacts of soaking time, HnF cycles, wettability, and pore structure on oil recovery degree were quantified. The results demonstrate the crucial significance of wettability and pore structure in the soaking period. The dominant mechanism during water HnF in reservoirs characterized by well‐connected pore networks and minimal clay pores is micropore imbibition, while conversely, macropore displacement plays a predominant role. The oil recovery degree of fracturing fluid HnF primarily relies on mitigating solid‐fluid forces within macropores. The surfactant HnF in preferential water‐ and oil‐wet reservoirs is primarily governed by oil films stripped from macropore walls and micropore imbibition, respectively. Specifically, water and fracturing fluid HnF are suitable for shorter soaking time and fewer HnF cycles, whereas the surfactant HnF exhibits an inverse relationship.

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Experimental Study on the Two-Phase Seepage Law of Tight Sandstone Reservoirs in Ordos Basin

Xiao-dong²,

Zhu

et al. 2021

J. Energy Eng.

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Characteristics of imbibition in tight oil reservoirs from the perspective of physical experiments and theory

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 3 publications

References 28 publications

NMR Investigation of Brine Imbibition Dynamics in Pores of Tight Sandstones under Different Boundary Conditions

NMR Investigation of Brine Imbibition Dynamics in Pores of Tight Sandstones under Different Boundary Conditions

Study on the microscopic percolation mechanism of different aqueous media huff‐n‐puff with cores in Fengxi tight oil reservoirs of Qinghai Oilfield

Experimental Study on the Two-Phase Seepage Law of Tight Sandstone Reservoirs in Ordos Basin

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