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 Repjournal_title
Scientific reportsauthors
Wang J,Xiao L,Liao G,Zhang Y,Guo L,Arns CH,Sun Zdoi
10.1038/s41598-018-31803-wsubject
Has Abstractpub_date
2018-09-07 00:00:00pages
13450issue
1issn
2045-2322pii
10.1038/s41598-018-31803-wjournal_volume
8pub_type
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