The second critical capillary number for chemical flooding in low permeability reservoirs: Experimental and numerical investigations

Li, Ying; Li, Haitao; Chen, Shengnan; Mbia, Ernest Ncha; Wu, Keliu

doi:10.1016/j.ces.2018.11.004

Cited by 47 publications

(13 citation statements)

References 45 publications

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“…Special apparatus (see Figures 4 and 5) designed to measure the dynamic capillary pressure of tight porous media was employed to examine the dynamic effect during the displacement process in the fractured tight column samples. 38 Two important parts of the apparatus are the modified pressure transducers (PTs) and the LCR meter (type TH2810D), respectively. As for the pressure transducers, semipermeable plates and probes are fixed in them, with the probes in contact with the rock sample sides.…”

Section: Apparatusmentioning

confidence: 99%

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Luo

et al. 2019

Energy Science & Engineering

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Dynamic capillarity commonly exists for multiphase flow in porous media, during which fluid viscosity varies and has strong influence. Displacement experiments are conducted on water-wet, fractured tight rock at in situ pressure and temperature of an oil reservoir via a specially designed apparatus to investigate the effects of fluid viscosity on the dynamic capillarity. The dynamic effect in the matrix is examined through the measurement and calculation of capillary pressure, the dynamic coefficient, and the fluid flow behavior. The results show that with a higher oil viscosity:(a) both the steady and the dynamic capillary pressures reverse their directions more quickly and behave as larger resistances in the matrix; (b) the difference between the steady and the dynamic capillary pressures becomes around 5%-19% more significant; (c) water saturation changes more slowly corresponding to the lower water relative permeability, while oil relative permeability quickly becomes lower than that during the basic displacement process; and (d) the dynamic coefficient becomes 2-3 times higher, and the dynamic contact angle becomes 10%-25% larger, showing a more variable interface. A contact angle advancement coefficient is proposed to identify the significance of contact angle advancement and the competition between capillary pressure and viscous force. The findings of this study can help for better understanding of multiphase flow in tight reservoirs and enhancing oil recovery.

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Section: Apparatusmentioning

confidence: 99%

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Luo

et al. 2019

Energy Science & Engineering

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“…During the displacement process, the P c – S w relationships are dynamic, and their dependence on the ∂S w / ∂t is regarded as the dynamic effect . This dynamic effect has been intensely discussed in the literature via experiments, analytical studies, and mathematical modeling . Several models have been developed to quantitatively demonstrate the dynamic effect on the P c – S w relationship .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks

Chen

et al. 2019

AIChE Journal

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This work investigates the dynamic capillary pressure during the displacement process in fractured tight rocks, through specially designed experiments on fractured and intact core samples. The dynamic capillarity coefficient of matrix and the multiphase flow behaviors are also obtained. Results have shown that the dynamic capillary pressure of the matrix becomes around 5-20% higher after the fracturing treatment. The lower and less variable values of dynamic capillarity coefficient of matrix illustrate a weakened dynamic effect and a more uniform displacement front. Moreover, time derivative of water saturation is increased significantly with fractures. Finally, oil relative permeability after fracturing is lower than its value of the intact core at high water saturations. A dynamic capillarity coefficient model for matrix, which includes the influence of fractures, is derived and verified with the average R 2 more than 0.95. This wok helps to understand and predict multiphase flow in fractured tight porous media.

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“…The experimental procedures are the same as our previously published papers (Li et al, , 2017(Li et al, , 2019. The original water and oil saturations were firstly achieved, and the experimental rig was prepared by vacuuming and saturating the semi-permeable plates.…”

Section: Methodsmentioning

confidence: 99%

“…The apparatus (Fig. 2) is specially designed to investigate the dynamic effect in capillary pressure and the fluid flow behavior during the displacement process in low to tight porous media under high pressure and high temperature (Li et al, 2019). The vital units are the pressure measurement unit and the fluid saturation measurement unit.…”

Section: Apparatusmentioning

confidence: 99%

The dynamic effect in capillary pressure during the displacement process in ultra-low permeability sandstone reservoirs

Cai

et al. 2018

Capillarity

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The second critical capillary number for chemical flooding in low permeability reservoirs: Experimental and numerical investigations

Cited by 47 publications

References 45 publications

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks

The dynamic effect in capillary pressure during the displacement process in ultra-low permeability sandstone reservoirs

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