Study on the association driving force of low temperature coal tar asphaltenes

Du, Chongpeng; Li, Dong; Shi, Chao Lin; Du, Zonggang; Han, Wei; Yu, Zhu; Dong, Huan; Fan, Xiaodong; Wang, Chong

doi:10.1016/j.molstruc.2022.132361

Cited by 5 publications

(3 citation statements)

References 21 publications

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“… 20 , 32 , 33 , 48 , 49 According to the results of these investigations, the mineral–brine interface must be positively charged for asphaltene adsorption to occur because the electrostatic interaction is said to be the primary regulating mechanism. 50 This consequently changes the wettability. Although various wettability alteration mechanisms have been identified in the literature studies, 51 − 53 several factors, such as oilfield operations and ion-specific interactions, affect reservoir wettability.…”

Section: Wettability Alteration and The ζ-Potentialmentioning

confidence: 99%

“…Since asphaltene is believed to be predominately negatively charged, mineral surfaces must be positively charged for asphaltene adsorption to occur . We have previously discussed the various minerals found in the reservoir, their surface charges, the composition of the brine, and the forms of salts that can create a mineral surface that can act as a precursor to asphaltene adsorption. ,,,, According to the results of these investigations, the mineral–brine interface must be positively charged for asphaltene adsorption to occur because the electrostatic interaction is said to be the primary regulating mechanism . This consequently changes the wettability.…”

Section: Wettability Alteration and The ζ-Potentialmentioning

confidence: 99%

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Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

et al. 2022

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Scale formation and deposition in the subsurface and surface facilities have been recognized as a major cause of flow assurance issues in the oil and gas industry. Sulfate-based scales such as sulfates of calcium (anhydrite and gypsum) and barium (barite) are some of the commonly encountered scales during hydrocarbon production operations. Oilfield scales are a well-known flow assurance problem, which occurs mainly due to the mixing of incompatible brines. Researchers have largely focused on the rocks’ petrophysical property modifications (permeability and porosity damage) caused by scale precipitation and deposition. Little or no attention has been paid to their influence on the surface charge and wettability of calcite minerals. Thus, this study investigates the effect of anhydrite and barite scales’ presence on the calcite mineral surface charge and their propensity to alter the wetting state of calcite minerals. This was achieved vis-à-vis zeta-potential (ζ-potential) measurement. Furthermore, two modes of the scale control (slug and continuous injections) using ethylenediaminetetraacetic acid (EDTA) were examined to determine the optimal control strategy as well as the optimal inhibitor dosage. Results showed that the presence of anhydrite and barite scales in a calcite reservoir affects the colloidal stability of the system, thus posing a threat of precipitation, which would result in permeability and porosity damage. Also, the calcite mineral surface charge is affected by the presence of calcium and barium sulfate scales; however, the magnitude of change in the surface charge via ζ-potential measurement is insignificant to cause wettability alteration by the mineral scales. Slug and continuous injections of EDTA were implemented, with the optimal scale control strategy being the continuous injection of EDTA solutions. The optimal dosage of EDTA for anhydrite scale control is 5 and 1 wt % for the formation water and seawater environments, respectively. In the case of barite, in both environments, an EDTA dosage of 1 wt % suffices. Findings from this study not only further the understanding of the scale effects on calcite mineral systems but also provide critical insights into the potential of scale formation and their mechanisms of interactions for better injection planning and the development of a scale control strategy.

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Section: Wettability Alteration and The ζ-Potentialmentioning

confidence: 99%

Section: Wettability Alteration and The ζ-Potentialmentioning

confidence: 99%

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

et al. 2022

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“…However, existing research − has suggested that considerable heavy fractions in coal tar (e.g., asphaltene and resin) are easy to produce aggregates or trigger free radical reaction through molecular force for their highly condensed and multi heteroatom structure. As a result, heavy fractions are incompletely converted into light components in the processing process.…”

Section: Introductionmentioning

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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Alternation of asphaltene binding arrangement in the presence of chemical inhibitors: Molecular dynamics simulation strategy

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Rezaei

Zendehboudi

2023

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Study on the association driving force of low temperature coal tar asphaltenes

Cited by 5 publications

References 21 publications

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

Effect of Sulfate-Based Scales on Calcite Mineral Surface Chemistry: Insights from Zeta-Potential Experiments and Their Implications on Wettability

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

Alternation of asphaltene binding arrangement in the presence of chemical inhibitors: Molecular dynamics simulation strategy

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