Microstructural Investigation of Stress-Dependent Permeability in Tight-Oil Rocks

King, H. E.; Sansone, Michael; Kortunov, Pavel; Xu, Yun; Callen, Nicole; Chhatre, Shreerang S.; Sahoo, Hemant; Buono, Antonio

doi:10.30632/pjv59n1-2018a3

Cited by 9 publications

(11 citation statements)

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“…The difference in the bead sizes results in a large difference in the absolute permeabilities of the strata; we estimate these using the Kozeny-Carman equation previously validated for bead packings, 57], where i ∈ {c, f } denotes the stratum, yielding k c ≈ 120 µm 2 and k f = 1.9 µm 2 . The permeability ratio is then k c /k f ≈ 60, comparable to the permeability ratio characterizing many naturally-occurring strata [40].…”

Section: Experimental Methodsmentioning

confidence: 90%

“…For example, these results could provide insight into the pathways taken by fluids during oil/gas recovery from a stratified reservoir or from microporous media [37,38,40,81,82]-an increasingly important application given society's rising energy demands. Another operationally similar application of our work will be to inform strategies for injecting fluid to recover nonaqueous contaminants from a stratified porous groundwater aquifer [37,83]-another critical application due to the increasing need for water security.…”

Section: Discussionmentioning

confidence: 99%

“…However, in many cases, porous media are not homogeneous. Instead, they can have parallel strata, characterized by different mean pore sizes, oriented along the direction of macroscopic fluid flow [37][38][39][40]; these can further impact the interfacial dynamics in complex ways [37][38][39][40][41][42][43][44]. Being able to predict and control imbibition in stratified porous media is therefore both fundamentally interesting and of critical practical importance.…”

Section: Introductionmentioning

confidence: 99%

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Forced Imbibition in Stratified Porous Media

Lu,

Pahlavan,

Browne

et al. 2020

Preprint

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Imbibition plays a central role in diverse energy, environmental, and industrial processes. In many cases, the medium has multiple parallel strata of different permeabilities; however, how this stratification impacts imbibition is poorly understood. We address this gap in knowledge by directly visualizing forced imbibition in three-dimensional (3D) porous media with two parallel strata. We find that imbibition is spatially heterogeneous: for small capillary number Ca, the wetting fluid preferentially invades the fine stratum, while for Ca above a threshold value, the fluid instead preferentially invades the coarse stratum. This threshold value depends on the medium geometry, the fluid properties, and the presence of residual wetting films in the pore space. These findings are well described by a linear stability analysis that incorporates crossflow between the strata. Thus, our work provides quantitative guidelines for predicting and controlling flow in stratified porous media.

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Section: Experimental Methodsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forced Imbibition in Stratified Porous Media

Lu,

Pahlavan,

Browne

et al. 2020

Preprint

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“…Thus, we anticipate that this work will help guide imbibition processes in energy, environmental, and industrial applications that seek to control both t b and S O . Two prominent examples include pump-andtreat remediation of contaminated groundwater aquifers [40,82] and enhanced oil/gas recovery [40,41,43,83,84]; in both cases, injected wetting fluids are used to displace nonwetting fluid from heterogeneous subsurface media as quickly and effectively as possible. Other examples include controlling moisture wicking in building materials [21][22][23], layered microporous fabrics [85][86][87], and paper microfluidics [20,[88][89][90],…”

Section: E Comparison To An Averaged Modelmentioning

confidence: 99%

“…However, in many cases, porous media are not homogeneous. Instead, they can have parallel strata, characterized by different mean pore sizes, oriented along the direction of macroscopic fluid flow [40][41][42][43]; these can further impact the interfacial dynamics in complex ways [40][41][42][43][44][45][46][47]. Being able to predict and control imbibition in stratified porous media is therefore both fundamentally interesting and of critical practical importance.…”

Section: Introductionmentioning

confidence: 99%

Forced Imbibition in Stratified Porous Media: Fluid Dynamics and Breakthrough Saturation

Lu,

Amchin,

Datta

2021

Preprint

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Imbibition, the displacement of a nonwetting fluid by a wetting fluid, plays a central role in diverse energy, environmental, and industrial processes. While this process is typically studied in homogeneous porous media with uniform permeabilities, in many cases, the media have multiple parallel strata of different permeabilities. How such stratification impacts the fluid dynamics of imbibition, as well as the fluid saturation after the wetting fluid breaks through to the end of a given medium, is poorly understood. We address this gap in knowledge by developing an analytical model of imbibition in a porous medium with two parallel strata, combined with a pore network model that explicitly describes fluid crossflow between the strata. By numerically solving these models, we examine the fluid dynamics and fluid saturation left after breakthrough. We find that the breakthrough saturation of nonwetting fluid is minimized when the imposed capillary number Ca is tuned to a value Ca * that depends on both the structure of the medium and the viscosity ratio between the two fluids. Our results thus provide quantitative guidelines for predicting and controlling flow in stratified porous media, with implications for water remediation, oil/gas recovery, and applications requiring moisture management in diverse materials.

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Laboratory Study of the Petrophysical Effect of Natural Fractures on Gas Flow Through Naturally Fractured Tight Cores

Zhou

et al. 2019

Proceedings of the International Field Exploration and Development Conference 2018

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Microstructural Investigation of Stress-Dependent Permeability in Tight-Oil Rocks

Cited by 9 publications

References 0 publications

Forced Imbibition in Stratified Porous Media

Forced Imbibition in Stratified Porous Media

Forced Imbibition in Stratified Porous Media: Fluid Dynamics and Breakthrough Saturation

Laboratory Study of the Petrophysical Effect of Natural Fractures on Gas Flow Through Naturally Fractured Tight Cores

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