Wettability Alteration and Enhanced Oil Recovery Induced by Proximal Adsorption of Na+, Cl–, Ca2+, Mg2+, and SO42– Ions on Calcite

Liu, Jian; Wani, Omar B.; Alhassan, Saeed M.; Pantelides, Sokrates T.

doi:10.1103/physrevapplied.10.034064

Title: Wettability Alteration and Enhanced Oil Recovery Induced by Proximal Adsorption of Na+, Cl^–, Ca²⁺, Mg²⁺, and SO₄^2– Ions on Calcite

Journal Article · Thu Sep 27 00:00:00 EDT 2018 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.10.034064· OSTI ID:1544203

Liu, Jian ^[1]; Wani, Omar B. ^[2]; Alhassan, Saeed M. ^[2]; Pantelides, Sokrates T. ^[1]

Vanderbilt Univ., Nashville, TN (United States)
Khalifa Univ. of Science and Technology, Abu Dhabi (United Arab Emirates)

The underlying wettability alteration mechanism responsible for enhanced oil recovery (EOR) in carbonate reservoirs is a long-standing issue for which no consensus has yet been reached. In this paper, we report extensive quantum molecular dynamics simulations to reveal the roles of wettability modifiers Na⁺, Cl^–, Ca²⁺, Mg²⁺, and SO₄^2– ions in EOR. Characterizing wettability by contact angle using the work-of-adhesion approach, we find that the calcite surface is strongly hydrophilic, with the first two wetting layers hindering all ions from reaching the surface, i.e., ions are only “proximally adsorbed.” Na⁺ and Cl^– ions settle closer to the surface and actually disturb the interfacial water structure of the first two wetting layers, which renders the surface less water-wet and thus inhibits oil recovery, as observed. Ca²⁺, Mg²⁺ and SO₄^2– ions, on the other hand, settle farther from the surface and retain the interfacial water structure, but render the surface more water-wet by modifying the effective charge on the surface, which enhances oil recovery, as observed. The impact of the ions is more pronounced at high temperatures as proximal adsorption is enhanced. In addition to theory, we report new core flooding measurements that corroborate the theoretical results. We report the present study brings new insights into the wettability alteration mechanism in EOR at the atomic scale.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC); Abu Dhabi National Oil Company (ADNOC); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; ACI-1053575

OSTI ID:: 1544203

Alternate ID(s):: OSTI ID: 1474199

Journal Information:: Physical Review Applied, Vol. 10, Issue 3; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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Title: Wettability Alteration and Enhanced Oil Recovery Induced by Proximal Adsorption of Na+, Cl^–, Ca²⁺, Mg²⁺, and SO₄^2– Ions on Calcite