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Issue 2, 2019
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Natural gas vaporization in a nanoscale throat connected model of shale: multi-scale, multi-component and multi-phase

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Abstract

Production of hydrocarbons from shale is a complex process that necessitates the extraction of multi-component hydrocarbons trapped in multi-scale nanopores. While advances in nanofluidics have allowed researchers to probe thermodynamics and transport in single, discrete nanochannels, these studies present a highly simplified version of shale reservoirs with homogeneous pore structures and/or single-component fluid compositions. In this study, we develop and apply a 30 000-pore nanomodel that captures the inherent heterogeneity in reservoir pore sizes (100 nm pores gated by 5 nm-pores) to study vaporization of a representative natural gas hydrocarbon mixture. The nanomodel matches major North American formations in the volumetric and number contributions of the pore sizes, porosity (10.5%), and ultra-low permeability (44 nD). Combined experimental and analytical results show 3000× slower vaporization owing to the nanoscale throat bottlenecks. At low temperatures, mixture effects reduce rates further with stochastic vaporization of light components in large pores dominating. Collectively this approach captures the coupled complexity of multicomponent, multiphase fluids in multiscale geometries that is inherent to this resource.

Graphical abstract: Natural gas vaporization in a nanoscale throat connected model of shale: multi-scale, multi-component and multi-phase

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Article information


Submitted
04 Oct 2018
Accepted
10 Dec 2018
First published
10 Dec 2018

Lab Chip, 2019,19, 272-280
Article type
Paper

Natural gas vaporization in a nanoscale throat connected model of shale: multi-scale, multi-component and multi-phase

A. Jatukaran, J. Zhong, A. Abedini, A. Sherbatian, Y. Zhao, Z. Jin, F. Mostowfi and D. Sinton, Lab Chip, 2019, 19, 272
DOI: 10.1039/C8LC01053F

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