A new approach for determination of carbonate rock electrostatic double layer variation towards wettability alteration

Ahmadi, Pouyan; Asaadian, Hamidreza; Khadivi, Armin; Kord, Shahin

doi:10.1016/j.molliq.2018.11.106

Cited by 45 publications

(13 citation statements)

References 30 publications

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“…The atomic analysis in the present work is consistent with the results of an experimental investigation of the influence of ions on the wettability state of carbonate rock [3]. The obtained results show that the lower structural energy of carbonate rock in comparison with that of sandstone surface represents a more stable thermodynamic condition for carbonate surface, so that the repulsive forces are more dominant in the presence of it in equal conditions (in terms of the number of other present atoms).…”

Section: Discussionsupporting

confidence: 89%

“…Figure 5 illustrates the detachment of asphaltene molecules under the influence of magnesium ions in the simulation cell for carbonate and silica surfaces using OVITO software (version 3.3.2). The superior role of these ions in facilitating the asphaltene detachment procedure is compatible with the experimental results of this molecular investigation [3]. Similar to the prior results, the detachment distance also has a minimum value for both cases (carbonate and sandstone surfaces), as long as all the ions simultaneously exist in the simulation cells.…”

Section: Detachment Of Asphaltene Molecule From Rock Surfaces Under T...supporting

confidence: 90%

“…Smart water flooding has been proven to be one of the most successful methods for improving oil recovery due to the impact of water chemistry and salinity on reservoir fluid-fluid and rock-fluid interactions [1][2][3][4][5]. It has been shown that the recovery of crude oil can be improved by manipulating the injection water [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Ion-mediated desorption of asphaltene molecules from carbonate and sandstone structures

Ahmadi

Aghajanzadeh

Asaadian

et al. 2022

Mater. Res. Express

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As more and more oil recovery scenarios use seawater, the need to identify the possible mechanisms of wettability state changes in oil reservoirs has never been greater. By using molecular dynamics simulations, this study sheds light on the effect of ions common to seawater (Ca2+, K+, Mg2+, Na+, Cl-, HCO3-, SO42-) on the affinity between silica and carbonate as the traditional rock types and asphaltene molecules as an important contributing factor of reservoir oil wetness. In the case of carbonate and silica being the reservoir rock types, the measured parameters indicate good agreement with each other, meaning that (HCO3- & SO42-) and (Na+ & Cl-) ions reached maximum bonding energies of (25485, 25511, 4096, and -4093 eV, respectively). As with the surface charge density measurements, the results of the non-bonding energies between the individual atomic structures agree with those from the simulation cell. In the presence of a silica surface, the radial distribution function (RDF) results determine that the peak of the maximum value for the distribution of the ions is 4.2. However, these values range from 3 to 6.6, suggesting that different ions perform better under the influence of carbonate rock. As these ions are distributed in the simulation box along the adsorption domain, the conditions for sequestering asphaltene from the rock surface are made ideal for dissolution and removal. At equal ion strength, measuring the distance between the center of mass of rocks and asphaltene structures reveals a maximum repulsion force of 22.1 Å and a maximum detachment force of 10.4 Å in the presence of SO42- and Na+ ions on carbonate and silica surfaces.

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Section: Discussionsupporting

confidence: 89%

Section: Detachment Of Asphaltene Molecule From Rock Surfaces Under T...supporting

confidence: 90%

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Ion-mediated desorption of asphaltene molecules from carbonate and sandstone structures

Ahmadi

Aghajanzadeh

Asaadian

et al. 2022

Mater. Res. Express

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“…These studies have ignored the effect of rock presence in the tests; thus, they do not mimic the reservoir conditions. It is important to note that rock particles and asphaltene molecules have electrostatic interactions, which can lead to asphaltene adsorption onto the rock surface. , This polarity feature causes the asphaltene particles to respond to the magnetic field. , On the other hand, various other researchers have shown that the surface charge of rock is altered during the LSWF process. − ,,, Therefore, it is expected that there would be salinity-dependent interactions between rock and asphaltene molecules. Moreover, as explained before, the rock presence is effective in emulsion stability.…”

Section: Introductionmentioning

confidence: 99%

The Simultaneous Effect of Brine Salinity and Dispersed Carbonate Particles on Asphaltene and Emulsion Stability

2023

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The oil recovery improvement by low-salinity waterflooding (LSWF) must be achieved with minimal formation damage. The asphaltic fractions of crude oil can be destabilized when in contact with incompatible injection brines resulting in organic formation damage. Due to the lack of fundamental understanding about the potential effect of rock presence on this phenomenon, in this study, the simultaneous effect of brine salinity and calcite rock presence on asphaltene instability in an emulsified system was investigated by developing a new experimental protocol. In this method, calcite rock is dispersed in different brines with total salinity ranging from 0−189,365 ppm and then mixed with oil to find the rock and brine effect on asphaltene and emulsion stability. UV−vis spectroscopy is performed on the supernatant oil phase before and after contact with brine to assess quantitatively asphaltene instability. Oil/water IFT measurements before and after contact and microscopic analysis of the water droplet size were conducted to evaluate the water/oil interface behavior. Besides, the zeta-potential for suspended calcite particles in different brines was measured to evaluate the electrokinetics of rock-oil interaction. The results show increased asphaltene instability when oil makes contact with the brine in an emulsified system. This highly depends on the brine type, and the maximum precipitation occurred at an intermediate salinity with two-times diluted seawater. While the trend of before-contact IFT and the water-in-oil emulsion size at different salinities is consistent, the UV−vis absorbance of bulk oil shows a reverse tendency with the after-contact IFT. Asphaltene deposition generally increased when solid calcite particles were present in the emulsified system, and at higher salinities, more asphaltene adsorption on the rock surface occurred due to a larger attractive force between rock and asphaltene. This trend is consistent with the results of the zeta-potential measurements. These novel findings can help avoid unrepresentative results regarding organic damage in LSWF.

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“…An understanding of the liquid/solid interface charge described by the zeta potential and its relationship to rock surface wettability can reduce the uncertainty associated with wettability measurement methods [13][14][15][16][17][18][19][20]. The zeta potential is the electro-kinetic potential measured at the slipping plane located in the diffuse layer that separates the charged surface of the electrolyte solution, and it is considered to be a vital parameter in the monitoring of geophysical sub-surfaces, wettability control, and the adsorption of polar components in aquifers and oil reservoirs [19,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A New Framework to Quantify the Wetting Behaviour of Carbonate Rock Surfaces Based on the Relationship between Zeta Potential and Contact Angle

et al. 2020

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This study introduces a new framework to quantify the wettability of powdered carbonate rock from existing correlations between zeta potential and contact angle. The new framework has the potential to be faster and cheaper than conventional approaches and could increase confidence in surface wetting quantification, since the results are insensitive to the inherent heterogeneity of rock surfaces. The obtained results from experiments were used to develop a set of equations for determining the carbonate rock contact angle from streaming potential data. The equations were validated for the evaluation of changes in the wettability of carbonate rock using different stearic acid oily solutions. The contact angles calculated from the proposed equations were then compared with measured values on the calcite surface. The results show that the proposed framework was able to quantify the wettability of carbonate rock with an acceptable range of error of about 4%–14%.

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A new approach for determination of carbonate rock electrostatic double layer variation towards wettability alteration

Cited by 45 publications

References 30 publications

Ion-mediated desorption of asphaltene molecules from carbonate and sandstone structures

Ion-mediated desorption of asphaltene molecules from carbonate and sandstone structures

The Simultaneous Effect of Brine Salinity and Dispersed Carbonate Particles on Asphaltene and Emulsion Stability

A New Framework to Quantify the Wetting Behaviour of Carbonate Rock Surfaces Based on the Relationship between Zeta Potential and Contact Angle

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