Spontaneous imbibition in tight porous media with different wettability: Pore-scale simulation

Lin, Wei; Xiong, Shengwu; Liu, Yang; He, Ying; Chu, Shasha; Liu, Siyu

doi:10.1063/5.0042606

Cited by 79 publications

(29 citation statements)

References 41 publications

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“…The increasingly many examples of the use of 3D imaging pertain frequently to spontaneous liquid imbibition in sandstone structures, related generally to wettability owing to its important role in the development of oil/gas reservoir dynamics. Prior art illustrates the employment of non-destructive X-ray tomography, for example in combination with lattice Boltzmann multiphase modelling (Lin et al 2021). However, the spatial resolution in tomography is somewhat limited, reaching down to 0.07-0.1 μm only after lengthy exposure of 24-30 h at high voltage (~ 8 kV) (Maire and Withers 2014), which can lead to material changes.…”

Section: Transitioning From Bulk Flow Analysis To Pore-scale Phenomena: Future Workmentioning

confidence: 99%

Surface Patterning Increases Fluid Sorption Efficiency in Porous Reactive Coatings: A Model for Optimised Surface-Flow Filtration

et al. 2021

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A novel surface-flow filter has been designed to take advantage of a combination of both diffusion and lateral flow permeation, since active coatings, even if porous, tend to be far less permeable than through-flow constructs. The formation of a continuous coating layer virtually excludes any fluid transport into the coating other than by planar diffusion for gases or capillarity for liquids. This study considers the additional potential advantage of creating a pixelated/patterned coating, applied using a pin coater to form printed dots onto a highly permeable cellulose fibrous paper-like substrate. The coating—fine particulate calcium carbonate combined with micro-nanofibrillated cellulose as binder and humectant—reacts on exposure to NO2 gas to form calcium nitrate. Experimental results show an effective doubling of nitrate-forming efficiency using pixelated coating compared with a reference continuous layer coating. To establish an understanding of the comparative mechanisms of gas-coating contact, computational fluid dynamic modelling is used to generate surface pressure profiles combined with a pore network model of the coating to estimate theoretical fluid permeability and gas diffusion coefficients. Although pressure-driven permeation was calculated to be approximately two orders of magnitude less than the diffusive flow, it is concluded that patterned aerofoil pressure differential effects can reduce the impact of surface stagnant layering and so aid fluid transfer, boosting the diffusive transport, which in turn delivers greater contact efficiency based on the increased accessibility to the active coating.

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Section: Transitioning From Bulk Flow Analysis To Pore-scale Phenomena: Future Workmentioning

confidence: 99%

Surface Patterning Increases Fluid Sorption Efficiency in Porous Reactive Coatings: A Model for Optimised Surface-Flow Filtration

et al. 2021

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“…Reservoir permeability and original water saturation are important factors affecting the production capacity of gas reservoirs (Lin et al 2021), but there is still a lack of laboratory simulation experiments for quantitative study. Therefore, according to three types of permeability levels (K > 1 mD, 1 mD > K > 0.1 mD, K < 0.1 mD), 10 carbonate plunger cores with similar permeability of 2.5 cm in diameter in T 2 l 1 1 gas reservoirs of Moxi gas field were selected, and the head and tail were spliced as long core group.…”

Section: Experimental Designmentioning

confidence: 99%

Experimental study on production performance and reserves utilization law in carbonate gas reservoirs

Zhou

Zhang

et al. 2021

J Petrol Explor Prod Technol

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Carbonate gas reservoirs in China are rich in reserves. In the development process, there are many reserves with low permeability, low efficiency and low recovery degree. It is difficult to stabilize gas well production and prolong its life cycle. Under the condition of original water saturation (Sw) of 0%, 20%, 40%, 55% and 65%, respectively, the physical simulation experiment of gas reservoirs depletion development was carried out by using long core multi-point embedded pressure measuring system. The long cores with average gas permeability of 2.300 mD, 0.485 mD and 0.046 mD (assembled from 10 carbonate cores) were used to carry out this experiment. During the experiment, the pressure dynamics at different positions inside the long core and the gas production dynamics at the outlet were recorded in real time to reveal the production performance and reserves utilization law of carbonate gas reservoirs. The results show that the stable production period of tight reservoir in carbonate gas reservoirs is short, and the low production period is relatively long. The stable production time and recovery rate of gas reservoir increase with the increase of reservoir permeability and decrease with the increase of water saturation. The production of tight carbonate gas reservoirs with permeability less than 0.1 mD is greatly affected by pore water, and the reservoir pressure distribution shows a steep pressure drop funnel, and the reserves far from well are rarely used. Therefore, the reserves far from well should be utilized by closing well to restore formation pressure balance, densifying well pattern or transforming reservoir. The variation range of water saturation in the development of carbonate gas reservoirs is influenced by reservoir permeability and water saturation, and closely related to formation pressure gradient in production process. It decreases with the increase of reservoir permeability and increases with the increase of original water saturation. The research results provide a theoretical basis for understanding the relationship between physical properties of carbonate gas reservoirs and production performance, reserves utilization law, and realizing balanced utilization, efficient development and long-term stable production of carbonate gas reservoirs.

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“…Imbibition occurs under the action of the capillary force, which cannot be ignored in tight reservoirs [31]. In the imbibition process, the capillary force supplies the power to replace the oil in the secondary and tertiary pores with the water in the primary pores [32].…”

Section: Imbibition Modelmentioning

confidence: 99%

Division Method and Seepage Law of Seepage Channels in a Tight Reservoir

Fang

et al. 2021

Geofluids

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Tight oil reservoirs are characterized by a low porosity, low permeability, and strong heterogeneity. The macropores, throats, and microcracks in reservoirs are the main seepage channels, which affect the seepage law in the reservoirs. In particular, oil-water two-phase flow in different types of pores requires further study. In this study, two groups of online NMR displacement experiments were designed to study the seepage characteristics of tight oil reservoirs. It was found that the main seepage channels for oil-water two-phase flow are the microcracks, large pores, and throats in the reservoir. The large pores are mainly micron and submicron scale in size. The oil in the small pores is only transferred to the large pores through imbibition to participate in the flow, and there is no two-phase flow. Based on the influence of different pore structures on the seepage law of a tight reservoir, the pores were divided into seepage zones, and a multistage seepage model for tight reservoirs was established. Based on this model, the effects of the imbibition, stress sensitivity, threshold pressure gradient, and Jamin effect on model’s yield were studied. The results show that imbibition is no longer effective after a while. Owing to the stress sensitivity, the threshold pressure gradient, and the Jamin effect, oil production will be reduced. As the parameter value increases, the oil production decreases. The production decreases rapidly in the early stage of mining while decreases slowly in the later stage, exhibiting a trend of high yield in the early stage and stable yield in the later stage.

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Spontaneous imbibition in tight porous media with different wettability: Pore-scale simulation

Cited by 79 publications

References 41 publications

Surface Patterning Increases Fluid Sorption Efficiency in Porous Reactive Coatings: A Model for Optimised Surface-Flow Filtration

Surface Patterning Increases Fluid Sorption Efficiency in Porous Reactive Coatings: A Model for Optimised Surface-Flow Filtration

Experimental study on production performance and reserves utilization law in carbonate gas reservoirs

Division Method and Seepage Law of Seepage Channels in a Tight Reservoir

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