Experimental and mathematical model evaluation of asphaltene fractionation based on adsorption in porous media: Part 1. calcite reservoir rock

Taheri-Shakib, Jaber; Keshavarz, Vahid; Kazemzadeh, Ezzatallah; Hosseini, Seyed Ahmad; Rajabi-Kochi, Mahyar; Salimidelshad, Yaser; Hasan, Najmul; Bakhtiari, Hesam Aloki

doi:10.1016/j.petrol.2019.02.032

Cited by 30 publications

(7 citation statements)

References 62 publications

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“…Fractionation experiments of asphaltenes deposited in other porous mediums, such as silica, calcite, dolomite, and sandstone, were also carried out [4,137]. Asphaltenes were fractionated into four fractions, bulk, normally adsorbed, hard-adsorbed, and irreversibly adsorbed, with a Soxhlet extraction step added before dissolving the calcium carbonate [137][138][139]. A new experimental model of asphaltene deposition was developed on the basis of the deposition analysis of these asphaltene fractions in porous media under dynamic conditions, which resulted in good correlation for the asphaltene classifications in the porosity and permeability reduction model [138,139].…”

Section: Adsorption Onto Porous Mediummentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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Asphaltenes, as the heaviest and most polar fraction of petroleum, have been characterized by various analytical techniques. A variety of fractionation methods have been carried out to separate asphaltenes into multiple subfractions for further investigation, and some of them have important reference significance. The goal of the current review article is to offer insight into the multitudinous analytical techniques and fractionation methods of asphaltene analysis, following an introduction with regard to the morphologies of metals and heteroatoms in asphaltenes, as well their functions on asphaltene aggregation. Learned lessons and suggestions on possible future work conclude the present review article.

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Section: Adsorption Onto Porous Mediummentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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“…Pore structure and mechanical properties are the two most important aspects of rock macroscopic properties [10]. The pore structure is closely related to the adsorption and seepage of the fluids in the reservoir rock [11,12], while the mechanical properties contribute to the stability assessment and reinforcement measures of the rock constructions [13,14]. Many researchers have studied the variation of macroscopic rock properties after high-temperature heat treatment and achieved some progress.…”

Section: Introductionmentioning

confidence: 99%

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

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In deep geoengineering, including geothermal development, deep mining, and nuclear waste geological disposal, high temperature significantly affects the mineral properties of rocks, thereby changing their porous and mechanical characteristics. This paper experimentally studied the changes in mineral composition, pore structure, and mechanical characteristics of pyroxene granite heated to high temperature (from 25 °C to 1200 °C). The results concluded that (1) the high-temperature effect can be roughly identified as three stages: 25–500 °C, 500–800 °C, 800–1200 °C. (2) Below 500 °C, the maximum diffracted intensities of the essential minerals are comparatively stable and the porous and mechanical characteristics of granite samples change slightly, mainly due to mineral dehydration and uncoordinated thermal expansion; additionally, the failure mechanism of granite is brittle. (3) In 500–800 °C, the diffraction angles of the minerals become wider, pyroxene and quartz undergo phase transitions, and the difference in thermal expansion among minerals reaches a peak; the rock porosity increases rapidly by 1.95 times, and the newly created pores caused by high heat treatment are mainly medium ones with radii between 1 μm and 10 μm; the P-wave velocity and the elastic modulus decrease by 62.5% and 34.6%, respectively, and the peak strain increases greatly by 105.7%, indicating the failure mode changes from brittle to quasi-brittle. (4) In 800–1200 °C, illite and quartz react chemically to produce mullite and the crystal state of the minerals deteriorate dramatically; the porous and mechanical parameters of granite samples all change significantly and the P-wave, the uniaxial compressive strength (UCS), and the elastic modulus decrease by 81.30%, 81.20%, and 92.52%, while the rock porosity and the shear-slip strain increase by 4.10 times and 11.37 times, respectively; the failure mechanism of granite samples transforms from quasi-brittle to plastic, which also was confirmed with scanning electron microscopy (SEM).

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“…The sulfur mass percentage composition decreases to 0.04, 0.50, and 0.35% after cleaning the quartz surfaces with toluene, heptane, and acetone, respectively. The confirmation of the adsorption of crude oil components, particularly asphaltene, can be inferred from the presence of sulfur, as mentioned by Taheri-Shakib et al 86,87 Sulfur is not only a constituent of crude oil, but it is also present in the asphaltenic component of crude oil, which is referred to as asphaltenic sulfur according to previous studies. 88,89 The wettability trend, which was discussed in Section 3.1, can be attributed to crude oil/sulfur adsorption.…”

Section: Xrf Compositional Analysesmentioning

confidence: 79%

Influence of Surface Cleaning on the Wettability of Quartz/Oil/Brine Systems

et al. 2023

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Wettability is the measure of a liquid’s ability to adhere to or spread on a solid surface. The contact angle is a quantitative measure of wettability but can be affected by surface cleaning processes. The systematic investigation of wettability modification caused by surface cleaning is lacking. This study employs pure quartz substrates to examine the effect of rock surface cleaning on the wettability of rock/oil/brine systems. The nonporous substrates were polished and aged in solvents and formation fluids before being cleaned with different agents. Wettability was assessed using the contact angle technique at elevated pressures (0.1–50 MPa) and temperatures (353 K). The study also examined adsorption, surface morphology, roughness, and changes in rock strength using scanning electron microscopy (SEM), scanning probe microscopy (SPM), and nanoindentation. Fourier transform infrared spectroscopy (FTIR) and X-ray fluorescence (XRF) analyses were also performed before and after exposure to fluids. The results showed that interactions between quartz–brine, quartz–oil, and quartz–solvents significantly influence the wetting behavior. Our findings suggest that cleaning agents may not completely remove all adsorbed salts and crude oil components from the rock surfaces and may also adsorb onto the surfaces themselves, altering wettability. The presence of oxygen-containing groups, such as hydroxyl groups (O–H), increased the surface energy and promoted hydrophilic behavior, making the surface more water-wet. While the presence of nonpolar functional groups, like alkyl groups (−CH3), aromatic C–H, and methylene (CH2) groups, makes the surface more oil-wet. Interestingly, an increase in pressure has little or no effect on the contact angle of the n-decane/brine/rock system, but exposure to fluids did modify rock surface roughness and strength. Overall, this study provides valuable insights into rock surface cleaning and its influence on the wettability of rock/oil/brine systems. Understanding these interactions is crucial for various applications in the oil and gas industry.

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Experimental and mathematical model evaluation of asphaltene fractionation based on adsorption in porous media: Part 1. calcite reservoir rock

Cited by 30 publications

References 62 publications

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Influence of Surface Cleaning on the Wettability of Quartz/Oil/Brine Systems

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