Wettability Alteration and Enhanced Oil Recovery Induced by Proximal Adsorption of 
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Liu, Jian; Wani, Omar Bashir; Alhassan, Saeed M.; Pantelides, Sokrates T.

doi:10.1103/physrevapplied.10.034064

Cited by 49 publications

(32 citation statements)

References 66 publications

(122 reference statements)

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“…The development of such an EDL close to a neutral surface supports the idea that a double layer does not necessarily require the surface to be charged. 25,50 The sharp density peak of Na + ions, as shown in Figure 1d,e, The Journal of Physical Chemistry B Article exceeds that of the Cl − ions in the same layer, resulting in a net positively charged layer in proximity to the calcite surface. Such a compact layer of ions resembles the concept of a Stern layer that would form adjacent to a charged surface.…”

Section: ■ Resultsmentioning

confidence: 96%

The Impact of Salinity on the Interfacial Structuring of an Aromatic Acid at the Calcite/Brine Interface: An Atomistic View on Low Salinity Effect

et al. 2019

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This study aims to elucidate the impact of salinity on the interactions governing the adsorption of polar aromatic oil compounds onto calcite. To this end, molecular dynamics simulations were employed to assess adsorption of a model polar organic molecule (deprotonated benzoic acid, benzoate) on the calcite surface in NaCl brines of different concentration levels, namely, deionized water (DW), low-salinity water (LS, 5000 ppm), and sea water (SW; 45,000 ppm). Calcite was found to be completely covered by several wellordered water layers. The top hydration layer is very compact and prevents direct adsorption of benzoates onto the substrate. Instead, Na + ions form a distinct positively charged layer by adhering on the calcite substrate through inner-sphere complexion mode. Cl − ions mostly lodge on top of the adsorbed sodium cations, forming a negatively charged layer. The distribution of ions at the calcite/brine interface thus exhibits the features of an electrical double layer, composed of a Stern-like positive layer followed by a negative one. The positive charged layer attracts benzoates toward the surface. As such, the sodium ions attached onto the calcite can act as adsorption sites to connect benzoates to the surface. By increasing the salinity, more Na + ions adsorb onto the calcite surface, and the density of benzoate molecules at the interface is enhanced as a result of more Na + bridging ions. The monotonic salinity-dependent adsorption of benzoate molecules on calcite offers a mechanism driving additional oil recovery upon injection of diluted brine into subsurface carbonate reservoirs.

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Section: ■ Resultsmentioning

confidence: 96%

The Impact of Salinity on the Interfacial Structuring of an Aromatic Acid at the Calcite/Brine Interface: An Atomistic View on Low Salinity Effect

et al. 2019

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“…Many recent studies emphasize how the reduction of salinity [4][5][6]14,15 and presence of Mg 2+ and SO 4 2− 2,3,16-23 affect the rock-brine interaction by means of core-scale experiments, including spontaneous imbibition [2][3][4]24,25 and core flooding 5,11,12,17,19,25,26 tests. Moreover, fundamental studies have included zeta potential measurements 12,15,[27][28][29] , contact angle measurements 25,30,31 , density function theory calculations 20,21 and molecular dynamic simulation 14 . Brine composition is typically varied, with the corresponding changes in oil recovery or interfacial properties examined.…”

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confidence: 99%

Evaluating physicochemical properties of crude oil as indicators of low-salinity–induced wettability alteration in carbonate minerals

Song

Rezaee

Guo

et al. 2020

Sci Rep

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the injection of low-salinity brine enhances oil recovery by altering the mineral wettability in carbonate reservoirs. However, the reported effectiveness of low-salinity water varies significantly in the literature, and the underlying mechanism of wettability alteration is controversial. In this work, we investigate the relationships between characteristics of crude oils and the oils' response to low-salinity water in a spontaneous imbibition test, aiming (1) to identify suitable indicators of the effectiveness of low-salinity water and (2) to evaluate possible mechanisms of low-salinity-induced wettability alteration, including rock/oil charge repulsion and microdispersion formation. Seven oils are tested by spontaneous imbibition and fully characterized in terms of their acidity, zeta potential, interfacial tension, microdispersion propensity, water-soluble organics content and saturate-aromatic-resinasphaltene fractionation. For the first time, the effectiveness of low-salinity water is found to positively correlate with the oil interfacial tension in low-salinity water. Oils with higher interfacial activity are found to respond more positively to low-salinity water. Moreover, cryogenic transmission electron microscopy images suggest that microdispersion is essentially macroemulsion, and its formation is an effective indicator-but not the root cause-of wettability alteration. The repulsive zeta potential for the rock and the oil in low-salinity water is found to be an insufficient condition for wettability alteration in carbonate minerals.

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“…This is injected to trigger dissolution/precipitation effects from the Ca-Mg exchange (Madland et al 2009(Madland et al , 2011 and adsorption effects of magnesium ions on the calcite surface (Ahsan and Fabricius 2010;Alam et al 2010;Nermoen et al 2018;Liu et al 2018).…”

Section: Description Of Fluidsmentioning

confidence: 99%

Effect of Initial Wettability on Rock Mechanics and Oil Recovery: Comparative Study on Outcrop Chalks

et al. 2020

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Brines containing surface-active divalent ions such as Ca 2+ , Mg 2+ and SO 4 2− impact the stiffness, strength and time-dependent deformation of water wet Mons outcrop chalk. This study documents how stiffness and strength of wettability-altered oil and water-saturated (mixed wet) Mons chalk compare to water-saturated and water wet samples during hydrostatic loading and creep. During hydrostatic creep, the strain rate response to magnesium chloride (MgCl 2 ) brine injection is compared for water wet and mixed wet samples. For the mixed wet samples, the oil production was estimated during compaction and non-equilibrium MgCl 2 flow. The results presented here were then compared to a similar test series on Kansas outcrop chalk. The differences were interpreted in terms of difference in physical parameters such as porosity and pore size. Two Mons samples were wettability-altered and tested in parallel to two completely water wet samples from the same chalk block at hydrostatic conditions and 130 °C. It was found that beyond the experimental uncertainty, the stiffness and yield strength measurements showed insignificant differences for water wet and mixed wet Mons samples. This is contrary to Kansas chalk where mixed wet samples were systematically stronger and stiffer than water wet samples. In the following creep phase, both water wet and wettability-altered Mons chalk samples gave trends comparable to each other during a stagnant phase and a following MgCl 2 injection phase at varying flow rates. Similar observations were reported for water wet and wettability-altered Kansas chalks as well. Further, the same chemical reactions were observed for Kansas and Mons chalks and were found to be insensitive to the initial wettability and oil/water saturations. The oil production observations from Mons chalk showed that 43% of the total oil was recovered during early-stage compaction with no flow, whereas Kansas chalk did not produce any oil at no-flow conditions. After the oil recovery from the first 2-3 pore volumes of brine flow, no further oil production was observed due to compaction or non-equilibrium brine flow in any of the two chalk types.

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Wettability Alteration and Enhanced Oil Recovery Induced by Proximal Adsorption of Na+ , Cl− ,

Cited by 49 publications

References 66 publications

The Impact of Salinity on the Interfacial Structuring of an Aromatic Acid at the Calcite/Brine Interface: An Atomistic View on Low Salinity Effect

The Impact of Salinity on the Interfacial Structuring of an Aromatic Acid at the Calcite/Brine Interface: An Atomistic View on Low Salinity Effect

Evaluating physicochemical properties of crude oil as indicators of low-salinity–induced wettability alteration in carbonate minerals

Effect of Initial Wettability on Rock Mechanics and Oil Recovery: Comparative Study on Outcrop Chalks

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