Effect of different polar organic compounds on wettability of calcite surfaces

Al-Busaidi, Intisar K.; Al-Maamari, Rashid S.; Karimi, Mahvash; Naser, Jamil

doi:10.1016/j.petrol.2019.05.080

Cited by 40 publications

(32 citation statements)

References 30 publications

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“…According to the literature, the concentration of Ca 2+ ions increased when the pH was <10, resulting in a surface with a positive charge. 13,17 This is in line with the obtained results for fresh calcite (+6.4 mV) in the current study. However, adsorption of carbonate anions on the calcite surface results in alteration of the surface charge to negative when the pH is above 10.…”

Section: Impact Of Stearic Acid On Calcite Wettabilitysupporting

confidence: 92%

“…FTIR results are in good agreement with what has been reported previously. 12,13,18,38 Results of FTIR showed that the intensity of the peaks that were assigned to stearic acid adsorption on the calcite surface increased as the concentration of the acid increased.…”

Section: Impact Of Stearic Acid On Calcite Wettabilitymentioning

confidence: 99%

“…11 Moreover, the structure of acidic compounds including chain length and the number of benzene rings could influence wettability. 13 Out of many crude oil components causing wettability alteration of carbonates, long-chain fatty acids were reported to be the most responsible factors for wettability modification of carbonates toward more oilwetness. 16,17 Stearic acid was used in several studies to represent wettability alteration agents in crude oil.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Effect of Acid and Base on Wettability Alteration of a Calcite Surface

2021

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Wettability alteration toward a favorable wetting condition is one major mechanism of enhancing oil recovery in carbonates. Obtaining the desired wettability stipulates that a clear understanding of the original wetting properties of the rock surface be provided. In fact, the aim of this study is to elucidate the effect of acid and base upon the wettability alteration of a calcite surface by investigating the individual effects of an organic acid (stearic acid) and a base (N,N-dimethyldodecylamine, N,N-DMDA) at different concentrations as well as their combinations on calcite wetting properties. Contact angle, ζ-potential, Fourier transform infrared spectroscopy, and thermogravimetric analysis (TGA) were conducted to determine changes in wetting properties of the calcite surface. Moreover, interfacial tension (IFT) measurements were used to evaluate the interfacial activity of the model oil systems. Overall, the results revealed that by increasing the acid concentration, wettability of a calcite surface shifted toward more oil-wetness and adsorption of stearic acid on a calcite surface increased. Treating calcite surfaces with the base revealed that a low concentration of N,N-DMDA was able to shift the calcite wettability from a water-wet state to a slightly oil-wet state. In addition, TGA results showed low adsorption of the base with a high surface area occupied by the base molecule, indicating a horizontal orientation of the base on the calcite surface. For acid–base mixtures, at a constant acid concentration, the wettability alteration toward oil-wetness increased in the presence of the base, as the base-to-acid ratio increased up to 1, as a result of which oil-wetness decreased. Moreover, IFT measurements indicated lower IFT of acid–base mixtures compared to those of individual acidic and basic model oil solutions, which could be attributed to the synergistic effect between the acid and base by forming acid–base complexes. The presence of the base hindered acid adsorption on the calcite surface. However, the basic component could contribute to wettability alteration by forming acid–base complexes. These complexes could adsorb on the calcite surface and affect its wetting preferences. In addition, the base molecules may adsorb on the calcite surface at high base-to-acid ratios. The results suggested that the ratio of base to acid would determine the contribution of acid molecules, base molecules, and acid–base complexes in wettability alteration of calcite surfaces. Hence, possible mechanisms of wettability alteration by acid–base combinations were proposed at different base-to-acid ratios.

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Section: Impact Of Stearic Acid On Calcite Wettabilitysupporting

confidence: 92%

Section: Impact Of Stearic Acid On Calcite Wettabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Effect of Acid and Base on Wettability Alteration of a Calcite Surface

2021

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“…The ionized calcite surface in contact with water can react with complex organic ions or other inorganic ions in the medium, according to the following reactions: Due to the activation of calcite surface groups, H is provided to the free radicals during hydrocarbon cracking, promoting free-radical thermal cracking and inhibiting freeradical cross-linking (Figure 13). In the nC 16 H 34 -distilled water-calcite systems, more high-molecular hydrocarbons and polar molecules are adsorbed on the surface of calcite (Al-Busaidi et al, 2019;Marcano et al, 2019), which is in contact with the surface-active groups of calcite. On the one hand, it enhances the catalytic activity of the calcite surface groups.…”

Section: Interaction Mechanism Between Calcite and Hydrocarbon-bearing Fluidmentioning

confidence: 99%

Interactions between hydrocarbon-bearing fluids and calcite in fused silica capillary capsules and geological implications for deeply-buried hydrocarbon reservoirs

Jin

Yuan

Cao

et al. 2021

Sci. China Earth Sci.

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During the burial processes of deep/ultra-deep hydrocarbon reservoirs, the interactions between hydrocarbon-bearing fluids and reservoirs significantly affect the quality evolution of hydrocarbons and reservoirs; thus, this topic requires further investigation. In this study, the continuous evolution and the coupling mechanisms in various anhydrous and hydrous nC 16 H 34 -(water)-(calcite) systems in fused silica capillary capsules (FSCCs) were investigated using laser Raman spectroscopy, fluorescence color analysis, and fluorescence spectroscopy, and the mineral alterations were analyzed using scanning electron microscopy (SEM). The experimental results show that extensive organic-inorganic interactions occur in the systems if water is present, and different inorganic components have different effects on hydrocarbon degradation. Distilled water promotes freeradical thermal cracking and steps oxidation, forming more low-molecular-weight hydrocarbons, CO 2 , and organic acids (e.g., acetic acids) but suppresses the free-radical cross-linking, generating less high-molecular-weight hydrocarbons. However, in the presence of CaCl 2 water, the yields of hydrocarbon gases are lower than in the distilled water system because high concentrations of Ca ions inhibit the generation of free radicals. Calcites, which exhibit different surface reactivities in different fluid conditions, affect hydrocarbon degradation in different ways. In the anhydrous nC 16 H 34 -calcite system, calcites promote the generation of both hydrocarbon gases and high-molecular-weight hydrocarbons. In contrast, in the hydrous nC 16 H 34 -distilled (CaCl 2 ) watercalcite system, calcites promote the generation of hydrocarbon gases and suppress the generation of high-molecular-weight hydrocarbons. Calcite also reacts with organic acids via surface reactions to form secondary pores. Therefore, except for the formation temperature and pressure, organic-inorganic interactions are controlled by multiple factors, such as the water saturation, water type, water salinity, and the mineral content, resulting in different evolutions of the hydrocarbon degradation and reservoir properties.

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“…The reason may be that the unsaturated acid molecules mainly adsorb on the solid-liquid interface by van der Waals force with lower concentration. Meanwhile, in contrast to SA, the presence of C=C double bond makes unsaturated acids molecules more polar, reactive, and bent [58], which may increase the non-linear tendency of molecules, and reduce the adsorption space and amount of unsaturated fatty acid molecules on the surface of rhodochrosite [59]. On the other hand, the values of Γ SL are smaller than Γ LG in stage 2 for OA, LA, and ALA from the results in Figure 7, suggesting the dominant adsorption of acids on liquid-air interface.…”

Section: Morphology Of Adsorbed Fatty Acid On Rhodochrosite Surfacementioning

confidence: 99%

Adsorption Behavior and Wettability of Rhodochrosite Surface: Effect of C18 Fatty Acid Unsaturation

Zhang

Li³

et al. 2020

Minerals

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Mineral surface wettability and its regulation by the adsorption of collectors have an important influence on the flotation performance. The adsorption behavior of C18 fatty acid with different unsaturation and its effect on rhodochrosite wettability was investigated with surface tension, contact angle, and atomic force microscopy (AFM) measurements. The results indicated that rhodochrosite hydrophobicity increased with the increasing concentration of fatty acid, along with the maximum contact angle (θmax) between hemimicelle concentration (HMC) and critical micelle concentration (CMC). Oleic acid (OA), linoleic acid (LA), and α-linolenic acid (ALA) had a higher θmax than stearic acid (SA), but the value decreased with the increase of C=C bond number. Besides, preferential adsorption of unsaturated fatty acids on the liquid-air interface can be attributed to the molecule’s steric hindrance resulting from C=C double bond, and the θ kept almost invariant with a higher value of ΓLG than ΓSL until HMC. The oriented monolayer and bilayer structure of fatty acids formed gradually on rhodochrosite surface with increasing concentration. However, the θmax may not necessarily correspond to the beginning of bilayer formation. Cylindrical monolayer and bilayer micelles of SA molecules were observed on rhodochrosite surface at HMC and CMC, respectively. While bilayer structures of unsaturated fatty acids formed before complete coverage of monolayer on rhodochrosite surface because of surface heterogeneity. This work provided a good understanding on the adsorption mechanism of fatty acid on rhodochrosite for flotation.

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Effect of different polar organic compounds on wettability of calcite surfaces

Cited by 40 publications

References 30 publications

Experimental Investigation of the Effect of Acid and Base on Wettability Alteration of a Calcite Surface

Experimental Investigation of the Effect of Acid and Base on Wettability Alteration of a Calcite Surface

Interactions between hydrocarbon-bearing fluids and calcite in fused silica capillary capsules and geological implications for deeply-buried hydrocarbon reservoirs

Adsorption Behavior and Wettability of Rhodochrosite Surface: Effect of C18 Fatty Acid Unsaturation

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