Mechanistic understanding of asphaltenes surface behavior at oil/water interface: An experimental study

Moghadasi, Ramin; Kord, Shahin; Moghadasi, Jamshid; Dashti, Hossein

doi:10.1016/j.molliq.2019.04.123

Cited by 15 publications

(13 citation statements)

References 70 publications

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“…When two immiscible fluids, such as water and oil, are mixed, an emulsion is formed in which the droplets of one fluid are suspended in the bulk of the other fluid . Over the past few years, researchers have found that asphaltene contributes to the formation and stability of emulsions by participating at the water–oil interface. , Several studies have revealed that asphaltene forms a viscoelastic surface layer around the emulsion droplets, preventing them from joining each other. , Similarly, Tchoukov et al believe that asphaltene prevents droplets from sticking together by self-associating and forming a three-dimensional network in its structure. In addition, research has shown that the onset of asphaltene precipitation plays an important role in the stabilization of water in oil emulsions .…”

Section: Introductionmentioning

confidence: 99%

“…8 Over the past few years, researchers have found that asphaltene contributes to the formation and stability of emulsions by participating at the water−oil interface. 9,10 Several studies have revealed that asphaltene forms a viscoelastic surface layer around the emulsion droplets, preventing them from joining each other. 11,12 Similarly, Tchoukov et al believe that asphaltene prevents droplets from sticking together by self-associating and forming a three-dimensional network in its structure.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Brine Effect on Asphaltene Precipitation and Deposition during Water Injection in Porous Media Using Static and Dynamic Systems

Alizadeh

Soulgani

2021

Energy Fuels

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Asphaltene precipitation and deposition in porous media damages formation by reducing permeability and altering wettability, resulting in a significant reduction in reservoir oil production. Although the effects of some factors such as temperature, pressure, and composition have been studied over time, the effects of others, such as emulsified brine, remain uncertain and the available data in this area is limited. Most importantly, the effect of brine injection on deposition has never been studied in previous research. In this study, a number of systematic experiments were designed and conducted to investigate the effect of the aqueous phase. Several variables, including the water content, salt type, and salt concentration were studied in both the static and dynamic systems, and the evidence of consistent changes in asphaltene precipitation and deposition has been obtained. The results revealed that when the water amount reaches 50 wt %, asphaltene precipitation increases close to 10 wt %. However, as the amount of water increased, the intensity of asphaltene precipitation decreased. Furthermore, various salts have shown different behaviors in the static system and dual effects have been observed with increasing concentration. The optimum concentration of different salts was found to be between 25 000 and 40 000 ppm, MgCl2 producing the most asphaltene precipitation and KCl producing the least. MgCl2 at a concentration of about 40 000 ppm resulted in the precipitation of 7.8 wt % asphaltene and while this was 6.4 wt % for KCl 25 000 ppm. Also, for these salt concentrations, the interfacial tension reached 20.5 and 22.5 mN/m, respectively. Although the presence of water in the flooding system reduced the permeability up to 60% by depositing the asphaltene, unlike the static test, the presence of salt had no significant effect on the permeability reduction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Brine Effect on Asphaltene Precipitation and Deposition during Water Injection in Porous Media Using Static and Dynamic Systems

Alizadeh

Soulgani

2021

Energy Fuels

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“… 6 Any changes in these parameters in the crude oil could disturb the stability of asphaltene, leading to asphaltene aggregation, precipitation, and deposition. 13 , 14 …”

Section: Introductionmentioning

confidence: 99%

“…6 Any changes in these parameters in the crude oil could disturb the stability of asphaltene, leading to asphaltene aggregation, precipitation, and deposition. 13,14 The application of CO 2 in the petroleum industry has gained considerable interest especially in enhanced oil recovery (EOR). 9,10,15−17 It has been shown that when CO 2 is dissolved in oil, it reduces oil's viscosity, and it tends to be completely miscible with crude oil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Dioxide on Paraffinic Bitumen Froth Treatment: Asphaltene Precipitation from a Commercial Bitumen Froth Sample

et al. 2021

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In this study, the effect of carbon dioxide in assisting paraffinic bitumen froth treatment was investigated. The work was divided into two parts, the effect of water addition on CO 2 -assisted asphaltene precipitation from a dry and clean bitumen sample by n -heptane and the effect of CO 2 injection to a mixture of n -heptane and a commercial bitumen froth sample. It was found that water addition to the dry and clean bitumen improved the beneficial effect of CO 2 on promoting asphaltene precipitation by n -heptane, where asphaltene precipitation increased by 2.5 percentage points (or 19%) with the presence of water and CO 2 . The asphaltene precipitation enhancement may be due to chemical reactions between injected CO 2 and water in the formation of carbonic acid in the aqueous phase, which destabilized asphaltene. On the other hand, no improvement was detected under the control tests (N 2 ). Similar results were observed in the case of CO 2 injection to paraffinic solvent ( n -heptane) treatment of the commercial bitumen froth sample. The results indicated that when the commercial bitumen froth sample was mixed with n -heptane at a solvent/bitumen ratio of 1.08, the injection of 1.7 MPa CO 2 increased the amount of precipitated asphaltene from 10.0 ± 0.1% (without CO 2 ) to 15.2 ± 0.2% (with 1.7 MPa CO 2 ) at 90 °C, indicating a potential reduction of solvent usage by about 66%.

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“…Previous reports indicate that the process of asphaltene deposition near the wellbore region primarily depends on the rate of the process [54]. The slow kinetics of asphaltene deposition is an obstacle to understanding asphaltene behaviour [55][56][57][58]. It is reported that the kinetics of asphaltene precipitation near the onset of instability is very slow.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic study to investigate the effects of different gas injection scenarios on the rate of asphaltene deposition: An experimental approach

Dashti

Zanganeh

Kord

et al. 2020

Fuel

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Asphaltene deposition during enhanced oil recovery (EOR) processes is one of the most problematic challenges in the petroleum industry, potentially resulting in flow blockage. Our understanding of the deposition mechanism with emphasis on the rate of the asphaltene deposition is still in its infancy and must be developed through a range of experiments and modelling studies. This study aims to investigate the rate of asphaltene deposition through a visual study under different gas injection scenarios. To visualise the asphaltene deposition, a high-pressure setup was designed and constructed, which enables us to record high-quality images of the deposition process over time. Present research compares the effects of nitrogen (N2), carbon dioxide (CO2) and methane (CH4) on the rate of asphaltene deposition at different pressures. The experimental results in the absence of gas injection revealed that the rate of asphaltene deposition increases at higher pressures. The results showed that the rate of asphaltene deposition in the case of CO2 injection is 1.2 times faster than CH4 injection at 100 bar pressure. However, N2 injection has less effect on the deposition rate. Finally, it has been concluded that the injection of CO2 leads to more asphaltene deposition in comparison with CH4 and N2. Moreover, the experimental results confirmed that gas injection affects the mechanism of asphaltene flocculation and leads to the formation of bigger 2 flocculated asphaltene particles. The findings of this study can help for a better understanding of the mechanism of the asphaltene deposition during different gas-EOR processes.

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Mechanistic understanding of asphaltenes surface behavior at oil/water interface: An experimental study

Cited by 15 publications

References 70 publications

Experimental Investigation of the Brine Effect on Asphaltene Precipitation and Deposition during Water Injection in Porous Media Using Static and Dynamic Systems

Experimental Investigation of the Brine Effect on Asphaltene Precipitation and Deposition during Water Injection in Porous Media Using Static and Dynamic Systems

Effect of Carbon Dioxide on Paraffinic Bitumen Froth Treatment: Asphaltene Precipitation from a Commercial Bitumen Froth Sample

Mechanistic study to investigate the effects of different gas injection scenarios on the rate of asphaltene deposition: An experimental approach

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