Theoretical investigation of heterogeneous wettability in porous media using NMR.

Abstract:

:It is highly important to understand the heterogeneous wettability properties of porous media for enhanced oil recovery (EOR). However, wettability measurements are still challenging in directly investigating the wettability of porous media. In this paper, we propose a multidimensional nuclear magnetic resonance (NMR) method and the concept of apparent contact angles to characterize the heterogeneous wettability of porous media. The apparent contact angle, which is determined by both the wetting surface coverage and the local wettability (wetting contact angles of each homogeneous wetting regions or wetting patches), is first introduced as an indicator of the heterogeneous wettability of porous media using the NMR method. For homogeneously wetting patches, the relaxation time ratio T1/T2 is employed to probe the local wettabiity of wetting patches. The T2 - D is introduced to obtain the wetting surface coverage using the effective relaxivity. Numerical simulations are conducted to validate this method.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang J,Xiao L,Liao G,Zhang Y,Guo L,Arns CH,Sun Z

doi

10.1038/s41598-018-31803-w

subject

Has Abstract

pub_date

2018-09-07 00:00:00

pages

13450

issue

1

issn

2045-2322

pii

10.1038/s41598-018-31803-w

journal_volume

8

pub_type

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