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In situ characterization of mixed-wettability in a reservoir rock at subsurface conditions.

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Title: In situ characterization of mixed-wettability in a reservoir rock at subsurface conditions.
Authors: Alhammadi, AM
AlRatrout, A
Singh, K
Bijeljic, B
Blunt, MJ
Item Type: Journal Article
Abstract: We used X-ray micro-tomography to image the in situ wettability, the distribution of contact angles, at the pore scale in calcite cores from a producing hydrocarbon reservoir at subsurface conditions. The contact angle was measured at hundreds of thousands of points for three samples after twenty pore volumes of brine flooding.We found a wide range of contact angles with values both above and below 90°. The hypothesized cause of wettability alteration by an adsorbed organic layer on surfaces contacted by crude oil after primary drainage was observed with Scanning Electron Microscopy (SEM) and identified using Energy Dispersive X-ray (EDX) analysis. However, not all oil-filled pores were altered towards oil-wet conditions, which suggests that water in surface roughness, or in adjacent micro-porosity, can protect the surface from a strong wettability alteration. The lowest oil recovery was observed for the most oil-wet sample, where the oil remained connected in thin sheet-like layers in the narrower regions of the pore space. The highest recovery was seen for the sample with an average contact angle close to 90°, with an intermediate recovery in a more water-wet system, where the oil was trapped in ganglia in the larger regions of the pore space.
Issue Date: 7-Sep-2017
Date of Acceptance: 17-Aug-2017
URI: http://hdl.handle.net/10044/1/50831
DOI: https://dx.doi.org/10.1038/s41598-017-10992-w
ISSN: 2045-2322
Publisher: Nature Publishing Group
Journal / Book Title: Scientific Reports
Volume: 7
Issue: 1
Copyright Statement: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2017
Sponsor/Funder: Abu Dhabi Company for Onshore Petroleum Operations (ADCO)
Funder's Grant Number: 16312.01
Publication Status: Published online
Open Access location: http://www.nature.com/articles/s41598-017-10992-w
Article Number: 10753
Appears in Collections:Earth Science and Engineering



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