Cristin-resultat-ID: 1615735
Sist endret: 21. februar 2020, 13:07
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

The Effect of Non-Uniform Wettability and Heterogeneity on Induction Time and Onset of Spontaneous Imbibition

Bidragsytere:
  • Tore Lyngås Føyen
  • Bergit Brattekås og
  • Martin Fernø

Tidsskrift

SPE Journal
ISSN 1086-055X
e-ISSN 1930-0220
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Volum: 24
Hefte: 3
Sider: 1192 - 1200

Importkilder

Scopus-ID: 2-s2.0-85066746045

Beskrivelse Beskrivelse

Tittel

The Effect of Non-Uniform Wettability and Heterogeneity on Induction Time and Onset of Spontaneous Imbibition

Sammendrag

Spontaneous imbibition is a capillary-dominated displacement process in which a nonwetting fluid is displaced from a porous medium by the inflow of a more-wetting fluid. Decades of core-scale experiments have concluded that spontaneous imbibition occurs by a uniformly shaped saturation front with a rate that scales with the square root of time. The imbibition rate during early stages of spontaneous imbibition (the onset period) has been reported to deviate from the square-root-of-time behavior, although its effect on the imbibition process is not well-understood. Controlled-imbibition tests, presented in this paper, demonstrate that restricted wetting-phase flow during the onset period gives irregular saturation fronts and deviation from the square-root-of-time behavior. The deviation was caused by local variation in porosity and permeability or by a nonuniform wettability distribution, and was directly visualized or imaged by positron-emission tomography (PET). Without knowledge of local flow patterns, the development of irregular saturation fronts cannot be observed; hence, the effect cannot be accounted for, and the development of spontaneous imbibition might be erroneously interpreted as a core-scale wettability effect. Restricted wetting-phase flow at the inlet affects Darcy-scale wettability measurements, scaling, and modeling; our observations underline the need for a homogeneous wettability preference through the porous medium when performing laboratory spontaneous-imbibition measurements.

Bidragsytere

Tore Lyngås Føyen

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk og teknologi ved Universitetet i Bergen
  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Bergit Brattekås

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk og teknologi ved Universitetet i Bergen

Martin Fernø

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk og teknologi ved Universitetet i Bergen
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