A comprehensive study of asphaltene fractionation based on adsorption onto calcite, dolomite and sandstone

Taheri-Shakib, Jaber; Rajabi-Kochi, Mahyar; Kazemzadeh, Ezzatallah; Hasan, Najmul; Salimidelshad, Yaser; Esfahani, Mohammad Reza

doi:10.1016/j.petrol.2018.08.024

Cited by 42 publications

(4 citation statements)

References 45 publications

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Section: Adsorption Onto Porous Mediummentioning

confidence: 99%

“…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%

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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%

Section: Adsorption Onto Porous Mediummentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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“…The spectra range of 650-900 cm −1 is called the low-frequency region. The presence of broad and slightly sharp peaks indicates aromaticity, compounds of carboxylic acid dimers, amines, and amides in the molecular structure 86 . Figure 6b,c indicate dolomite adsorbent after aging in mesophilic and moderate thermophilic bacteria.…”

Section: Investigating the Effect Of Bacteria On Dolomite Adsorbent B...mentioning

confidence: 99%

An experimental study of the effects of bacteria on asphaltene adsorption and wettability alteration of dolomite and quartz

Soleimani,

Mohammadi,

Schaffie

et al. 2023

Sci Rep

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The adsorption of asphaltene on the rock surface and the changes in its wettability are very relevant issues in flow assurance and oil recovery studies, and for carbonate reservoirs, they are even more important. During microbial enhanced oil recovery (MEOR) processes, wettability alteration is considered a crucial mechanism leading to improved oil recovery. Therefore, it is essential to understand the mechanisms of surface wettability changes by bacteria and biosurfactants and find new and reliable methods to prevent asphaltene adsorption. Hence, the main aim of this research was to investigate the effect of a mixture of thiobacillus thiooxidans and thiobacillus ferooxidans microorganisms with an optimum effective temperature of around 30 °C (referred to as mesophilic bacteria), as well as a mixture of two moderate thermophiles Sulfobacillus thermosulfidooxidans for operating temperatures around 50 °C (referred to as moderately thermophilic bacteria) on the adsorption of asphaltene samples isolated from two different crude oils onto main reservoir minerals (i.e., quartz and dolomite). The results indicated that after two weeks of mineral aging in moderate thermophilic bacteria, the adsorption of asphaltene on both minerals increased between 180 and 290%. Fourier-transform infrared spectroscopy (FTIR) analysis for quartz and dolomite samples demonstrated that after aging in bacterial solution, bonds related to the adsorption of bacterial cells and biosurfactant production appear, which are the main factors of change in wettability. Alteration in wettability towards hydrophilicity expands hydrogen bonds on the surface, thus improving asphaltene adsorption due to polar interaction. Asphaltene 1 changed the contact angle of dolomite from 53.85° to 90.51° and asphaltene 2 from 53.85° to 100.41°. However, both strains of bacteria caused a strong water-wetting effect on the dolomite rock samples. The influence of moderate thermophilic bacteria on surface wettability is more significant than that of mesophilic bacteria, which may be caused by the high protein content of these bacteria, which expands hydrogen bonding with the surface. Adsorption of asphaltenes on dolomite rocks previously aged with bacteria showed that the wetted rock samples retained their water-wet state. This study highlights the dual impact of the used microorganisms. On one hand, they significantly reduce contact angles and shift wettability towards a strongly water-wet condition, a crucial positive factor for MEOR. On the other hand, these microorganisms can elevate the adsorption of asphaltenes on reservoir rock minerals, posing a potential challenge in the form of formation damage, particularly in low-permeability reservoirs.

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“…Furthermore, Shi et al [20] used geochemical and trace element analysis methods to classify the SB of the Longwangmiao and Dengying gas reservoirs into two types: high-maturity and low-maturity SB. Taheri-Shakib et al [21] studied the physicochemical properties of SB in the adsorbed and non-adsorbed components of sandstone, dolomite, and calcite rock powders by spectroscopy, elemental analysis, and SEM. Meanwhile, Gao et al [22] and Mastalerz et al [23] analyzed the characteristics of SB in dissolved pores, intergranular pores, and sutures with optical microscopy and SEM.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

Chen

Yang

et al. 2020

Energies

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A variable sedimentary environment and accumulation process leads to a complex pore structure in deep carbonate gas reservoirs, and the physical properties are quite different between layers. Moreover, some pores and throats are filled with solid bitumen (SB), which not only interferes with reservoir analysis, but also affects efficient development. However, previous studies on SB mainly focused on the accumulation process and reservoir analysis, and there are few reports about the influence on development. In this paper, through scanning electron microscope analysis, SB extraction, gas flow experiments and depletion experiments, and a similar transformation between experimental results and reservoir production, the production characteristics of carbonate gas reservoirs with different pore structures were studied, and the influence of SB on pore structure, reservoir analysis and development were systematically analyzed. The results show that permeability is one of the key factors affecting gas production rate and recovery, and the production is mainly contributed by high-permeability layers. Although the reserves are abundant, the gas production rate and recovery of layers with a low permeability are relatively low. The SB reduces the pore and throat radius, resulting in porosity and permeability being decreased by 4.73–6.28% and 36.02–3.70%, respectively. With the increase in original permeability, the permeability loss rate decreases. During development, the loss rate of gas production rate is much higher than that of permeability. Increasing the production pressure difference is conducive to reducing the influence. SB also reduces the recovery, which leads to the loss rate of gas production being much higher than that of porosity. For reservoirs with a high permeability, the loss rates of gas production rate and the amount produced are close to those of permeability and porosity. Therefore, in the reservoir analysis and development of carbonate gas reservoirs bearing SB, it is necessary and significant to analyze the influence of reservoir types.

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A comprehensive study of asphaltene fractionation based on adsorption onto calcite, dolomite and sandstone

Cited by 42 publications

References 45 publications

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

An experimental study of the effects of bacteria on asphaltene adsorption and wettability alteration of dolomite and quartz

Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

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