Functional compounds of crude oil during low salinity water injection

Mehraban, Mohammad Fattahi; Farzaneh, Seyed Amir; Sohrabi, Mehran

doi:10.1016/j.fuel.2020.119144

Cited by 15 publications

(2 citation statements)

References 72 publications

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“…The relative absorption intensity and the position of the absorption band in the FT-IR spectra can indicate the composition of functional groups, the bonding between functional groups, and their vibrational properties of the sample . Compared with the attribution results of characteristic absorption peaks generally involved in the analysis of coal tar and petroleum, , the FT-IR spectra fell into four regions, i.e., hydrogen bond region (I: 3650–3100 cm –1 ), aliphatic C–H stretching vibration region (II: 3000–2800 cm –1 ), C–O region (III: 1800–1000 cm –1 ), and aromatic C–H bending vibration region (IV: 900–600 cm –1 ), to investigate the functional group structure of the sample in depth. Figure presents the FT-IR spectra of heavy fractions at different CORs.…”

Section: Results and Discussionmentioning

confidence: 99%

Study on the Hydroconversion Law of Coal-Based Heavy Fractions with Different Catalyst Contents Based on an Improved Separation Method

et al. 2023

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Heavy fractions (e.g., asphaltene and resin) can easily be subjected to physical aggregation and chemical coking reaction through molecular force in the process of lightweight processing and use of coal tar (CT), such that the normal processing and use can be affected. In this study, hydrogenation experiments were performed by regulating the catalyst to oil ratio (COR), while the heavy fractions of the hydrogenated products were extracted based on a novel separation method (e.g., the resin with a poor separation effect and rare existing research). The samples were analyzed through Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. On that basis, the composition and structure characteristics of heavy fractions and the law of hydrogenation conversion were investigated. As indicated by the results, with the rise of the COR, the saturates, aromatics, resins, and asphaltenes (SARA) contents indicated the law of increasing the content of saturate, decreasing the content of other fractions, as well as sharply decreasing the content of asphaltene. Moreover, with the increase of the reaction condition, the relative molecular weight, the content of the hydrogen bonded functional groups and C–O groups, the carbon skeleton properties, the number of aromatic rings, and the stacking structure parameters were progressively reduced. In comparison with resin, asphaltene was characterized by large aromaticity and more aromatic rings, short and less alkyl side chains, as well as more complex heteroatoms on the surface of the heavy fractions. The results achieved in this study are expected to lay a solid basis for the relevant theoretical research and facilitate the industrial use process of CT processing.

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Section: Results and Discussionmentioning

confidence: 99%

Study on the Hydroconversion Law of Coal-Based Heavy Fractions with Different Catalyst Contents Based on an Improved Separation Method

et al. 2023

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“…It can be concluded that the oil phase must be crude oil, in which polar components play a critical role, including acids or bases. At the same time, acidic compounds with aliphatic nature and asphaltene molecules were proved to promote the spontaneous formation of W/O microdispersion and hence improve waterflood efficiency . Pore-level investigation results revealed that the oil recovery factor by LSW is logarithmically correlated with the oil polarity …”

Section: Prerequisites Of Lsementioning

confidence: 98%

Review on Underlying Mechanisms of Low Salinity Waterflooding: Comparisons between Sandstone and Carbonate

et al. 2022

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Low salinity effects (LSE) improved recovery could be obtained by reducing salinity and/or modifying the specific ions of injected brines. Low salinity waterflooding (LSW) is described as a certain low-cost and eco-friendly oil recovery technique, when referring the enhanced oil recovery (EOR) potential by laboratory observations and field pilots in recent decades. Various underlying mechanisms behind LSE were proposed, including saponification, multi-ionic exchange (MIE), electric double-layer (EDL) expansion, fines migration, salt in effect, osmotic effect, and so on. However, first, to our best knowledge, there is not yet a certain mechanism recognized by all experts. Second, LSE mechanisms of sandstones were always taken for granted to be applied directly to carbonates, without considering discrepancies in mineral compositions and pore structures. Third, spontaneous imbibition performances were usually concluded as the indication of wettability alteration, without considering the straightforward effects on imbibition caused by low salinity brine. Review results reveal LSE necessary conditions and influences. Necessary conditions should be satisfied to trigger LSE, including oil phase with polar components, connate water, injected brine key ions composition and low salinity, clay minerals, and initial wettability without the best performance. Their sole or mutual interactions influence LSE functions. Mechanisms could be classified into two types: solid–liquid and liquid–liquid. These (e.g., EDL expansion, MIE, fines migration) caused by solid–liquid could be attributed to wettability alteration, while microdispersion, osmosis effect, and snap-off belong to liquid–liquid interfacial factor. Sandstones mainly consist of quartz and clay, initially tending to behave as initial water wetness, while carbonates mainly consist of calcium carbonate or magnesium carbonate, mainly behaving as initial oil-wet. Therefore, LSE in carbonates are contributed to by mechanisms related with wettability alteration, while LSE in sandstones are mainly related to other factors. The findings of this study can help with better understanding of LSE and speeding up our further endeavors to explore its potential in EOR.

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Deformation and breakup mechanism of water droplet in acidic crude oil emulsion under uniform electric field: A molecular dynamics study

Sun

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Functional compounds of crude oil during low salinity water injection

Cited by 15 publications

References 72 publications

Study on the Hydroconversion Law of Coal-Based Heavy Fractions with Different Catalyst Contents Based on an Improved Separation Method

Study on the Hydroconversion Law of Coal-Based Heavy Fractions with Different Catalyst Contents Based on an Improved Separation Method

Review on Underlying Mechanisms of Low Salinity Waterflooding: Comparisons between Sandstone and Carbonate

Deformation and breakup mechanism of water droplet in acidic crude oil emulsion under uniform electric field: A molecular dynamics study

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