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Dong, Mingzhe; Dullien, F. A. L.

doi:10.1023/a:1006580207133

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…The effect is that the menisci in the larger tubes advance faster than the ones in the smaller tubes. Dong and Dullien [8] developed a capillary model for studying counter-current flow, the model consisted of two capillary tubes connected by two short capillaries at the ends of the tubes. Only the two capillaries were involved.…”

Section: Introductionmentioning

confidence: 99%

Co-current and counter-current imbibition in independent tubes of non-axisymmetric geometry

Ünsal

Mason

Morrow

et al. 2007

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Co-current and counter-current imbibition in independent tubes of non-axisymmetric geometry

Ünsal

Mason

Morrow

et al. 2007

Journal of Colloid and Interface Science

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“…There are only a few analytical models of waterflooding (Yortsos and Fokas 1983; Arthur 2011) available, which are limited to semi-infinite models of a domain for which certain capillary pressure function and viscous terms are assumed in the governing equation. Numerical simulations are usually used to model waterflooding (Douglas et al 1958;Kyte and Rapoport 1958). Here, we use the theoretical framework proposed by Whitaker (1986) in the form of a frontal advanced model with capillary pressure effects.…”

Section: Mathematical Modelmentioning

confidence: 99%

Pressure Evolution and Production Performance of Waterflooding inn-Heptane-Saturated Fired Berea Cores

Rezaei

Firoozabadi

2014

SPE Journal

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This work presents experimental results and interpretation of injection pressure and recovery performance of waterflooding in strongly water-wet fired Berea cores saturated with n-heptane. The experiments were conducted at constant injection rate at room conditions, and the effects of injection rate and initial water saturation on the oil-recovery performance and dynamic-injection pressure were investigated. Elements of surprise were observed in the injection-pressure data. The pressure profiles showed four distinct regimes, each governed by capillary or viscous forces. At low capillary numbers (Ca¼ul/r<10 -6 ), capillarity governed two pressure regimes, corresponding to the core inlet and outlet. In the early part of waterflooding, pressure stayed constant for a considerable time before hydrodynamic pressure gradient could overcome the capillary pressure gradient. After viscous forces dominated, a linear increase in injection pressure over time was observed up to breakthrough time. A sudden pressure rise was observed close to breakthrough because of capillary retention at the core outlet. The pressure became constant after the breakthrough when the waterand oil-saturation distributions were stabilized. Changing the injection rate by an order of magnitude in the range from 2.2 to 22.2 pore volumes (PV)/D (equivalent to Ca ¼ 10 -7 to 10 -6 ) did not appreciably change the oil-recovery performance; similar breakthrough time and final oil recovery were observed. The effect of initial water saturation was also investigated. When lowering the initial water saturation beyond that established in oil flooding, production performance and injection pressure were similar to those of a core without the initial water saturation. The injection pressure at breakthrough was found to decrease with increase of the initial water saturation. Waterflooding was modeled by including the capillary pressure and excellent agreement was obtained with experimental results of production and injection pressure. We find that in the absence of in-situ saturation measurements, the injection pressure is a better variable for tuning the model parameters compared with the production history alone.

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“…Firoozabadi [6] and Pooladi-Darvish and Firoozabadi [7] proposed that co-current imbibition may be the dominating process during oil recovery in fractured reservoirs, where the matrix blocks are partially contacted by both brine and oil. An alternative boundary condition, termed Two Ends Open-Free Spontaneous Imbibition (TEOFSI), was suggested by Dong, Dullien et al [8]. Their setup features two open ends, where one is contacted by the wetting phase and the other by the non-wetting phase, and favours co-current flow due to zero capillary pressure at the end face contacted by the non-wetting phase.…”

Section: Introductionmentioning

confidence: 99%

Dos and Don’ts When Developing a System to Investigate Spontaneous Imbibition in Unconsolicdated Porous Media

et al. 2019

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This paper describes the development of a consistent model system to measure spontaneous imbibition and determine saturation functions in unconsolidated porous media. Sand grains or glass beads were packed in up to 0.5 m long, transparent glass tubes with optical access to local saturation development during spontaneous imbibition processes. The Two Ends Open-Free spontaneous imbibition (TEOFSI) boundary condition was used, where one end face is exposed to the wetting ﬂuid and the other end to the non-wetting ﬂuid. Dynamic measurement of the advancing displacement front and volumetric production from each open end-face enabled estimation of capillary pressure and relative permeability for the system. A range of wetting- and non-wetting phase viscosities and viscosity ratios was used during spontaneous imbibition in unconsolidated sand or glass packs. Wetting phase (water) viscosity was increased using water soluble glycerol or polymers. Air or mineral oil of varying composition provided a wide range of non-wetting phase viscosities. High permeable systems are extremely sensitive to laboratory properties, which may dominate the viscous resistance and determine ﬂow behaviour. Systematic discrepancies observed in early testing indicated that end effects were present, even in long systems, in the ﬁlters at each end of the glass tube to maintain the grains or beads in place. Different ﬁlters were tested (no ﬁlter, glass, paper and micro-porous discs) to determine the impact of the ﬁlter on spontaneous imbibition. In addition to slower oil recovery than anticipated, developmentof a non-uniform displacement front was observed, demonstrating the large inﬂuence from minute heterogeneities within the packs, and at the end faces. A standard sand grain packing procedure, using a custom-designed packing device, was therefore developed to ensure homogeneous properties throughout theporous media, and limited the spread in porosity and permeability values. Homogeneous sand packs with reproducible properties are necessary, to systematically investigate ﬂow parameters and changes in wettability in unconsolidated porous media.

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Cited by 21 publications

References 16 publications

Co-current and counter-current imbibition in independent tubes of non-axisymmetric geometry

Co-current and counter-current imbibition in independent tubes of non-axisymmetric geometry

Pressure Evolution and Production Performance of Waterflooding inn-Heptane-Saturated Fired Berea Cores

Dos and Don’ts When Developing a System to Investigate Spontaneous Imbibition in Unconsolicdated Porous Media

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