Effect of the Ethylene Vinyl Acetate Copolymer on the Induction of Cyclopentane Hydrate in a Water-in-Waxy Oil Emulsion System

Peng, Zeheng; Wang, Wei; Cheng, Lin; Yu, Weijie; Li, Kai; Liu, Yingming; Wang, Mengxin; Xiao, Fan; Huang, Huirong; Liu, Yang; Ma, Qianli; Shi, Bohui

doi:10.1021/acs.langmuir.1c01734

Cited by 5 publications

(5 citation statements)

References 56 publications

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“…Additionally, the PMSQ microspheres were also compared to EVA and PVP, as the representatives of commercial PPDs and hydrate inhibitors, respectively, as illustrated in Figure . The results indicated that the addition of EVA alone had no evident inhibition effect on the hydrate formation in the 5 wt % wax-containing oil–water system without the help of surfactants Span 80 . On the other hand, 1000 ppm of PVP almost failed to inhibit CP hydrate nucleation, due to only withstanding a subcooling degree less than 10 K. In contrast, for the oil–water system absent from wax, adding 1000 ppm PMSQ microspheres also evidently delayed the induction time but was not as strong as that for the waxy oil–water system.…”

Section: Resultsmentioning

confidence: 94%

“…The results indicated that the addition of EVA alone had no evident inhibition effect on the hydrate formation in the 5 wt % wax-containing oil−water system without the help of surfactants Span 80. 30 On the other hand, 1000 ppm of PVP almost failed to inhibit CP hydrate nucleation, due to only withstanding a subcooling degree less than 10 K. In contrast, for the oil−water system absent from wax, adding 1000 ppm PMSQ microspheres also evidently delayed the induction time but was not as strong as that for the waxy oil−water system. This reflected the inhibition synergistic effect of PMSQ and wax on the hydrate nucleation, meaning an optimistic application potential in the flow safety of the oil and gas field.…”

Section: Effect Of Pmsq Microspheres On Hydrate Induction Timementioning

confidence: 97%

“…Instead, small hydrate crystals formed separately at the interface. 29 Peng et al 30 first reported adding different concentrations of poly(ethylene-co-vinyl acetate) (EVA) as a pour point depressant (PPD) combined with Span 80 could prolong the induction time of CP hydrate in waxy oil (D130 oil-CP)-water system.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Polymethylsilsesquioxane (PMSQ) Microspheres on Cyclopentane Hydrate Formation in Waxy Oil–Water Systems

Zhang,

Long,

et al. 2024

Energy Fuels

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Wax deposition and hydrate formation are two unwelcome problems that can threaten the safety of pipeline transportation in the oil and gas industry. The existing prevention methods mainly aim at the flow blockage resulting from single solid phase, but rarely take into account multi-solid-phase systems, such as hydrate-wax, hydrate-sand, etc. Recently, it has been proposed that adding pour point depressants (PPDs) can not only improve the rheological property of waxy oil but also have potential to inhibit hydrate formation. In this study, a series of PPD polymethylsilsesquioxane (PMSQ) microspheres were synthesized by a two-step sol− gel method. First, the effect of PMSQ microspheres on wax deposition in waxy mineral oil was tested by differential scanning calorimetry (DSC). Then, the influence of PMSQ microspheres on the cyclopentane (CP) hydrate formation in waxy oil−water systems at the atmospheric pressure and temperature of −3 °C was investigated by using a selfassembly high-pressure reactor. The experimental results showed that the addition of PMSQ microspheres could reduce the wax appearance temperature (WAT) of waxy oil and prolong the nucleation time of the CP hydrate. Powder X-ray diffraction and laser confocal micro-Raman data indicated that the presence of PMSQ did not affect the sII crystal structure of the CP hydrates. A possible inhibition mechanism of PMSQ microspheres by the steric hindrance effect was proposed.

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Section: Resultsmentioning

confidence: 94%

Section: Effect Of Pmsq Microspheres On Hydrate Induction Timementioning

confidence: 97%

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Effect of Polymethylsilsesquioxane (PMSQ) Microspheres on Cyclopentane Hydrate Formation in Waxy Oil–Water Systems

Zhang,

Long,

et al. 2024

Energy Fuels

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“…Gas hydrates are molecular inclusion compounds that trap small gas molecules, such as CH 4 , C 2 H 6 , and CO 2 , within polyhedral hydrogen-bonded water cavities under a high pressure and a low temperature, and there are three types of gas hydrate structures, i.e., structure I (sI), structure II (sII), and structure H (sH), depending on the type of guest molecule. Although gas hydrates are well-known as a new clean energy resource, studies on the prevention of nucleation and adhesion of hydrate particles from the surface of a specific substrate have recently attracted extensive attention in academia and industry to address issues, such as pipeline flow safety, because undesired hydrates adhered toughly on the oil and gas pipes generally lead to severe blockage or even shutdown of the pipeline system .…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Amphiphobic Coating toward Ultralow Interfacial Adhesion of Hydrates

Zhang

Fan

et al. 2023

Langmuir

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Hydrate adhesion is a challenging issue in some practical applications. However, most current anti-hydrate coatings fail to maintain their properties when subject to crude oil and corrosive contaminants. In addition, the effect of surface properties on the nucleation of hydrates is still unexplored from a microscopic perspective. In this study, a multifunctional amphiphobic PF/ZSM-5 coating consisting of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane modified ZSM-5 zeolite (F/ZSM-5) and adhesive polyethersulfone was fabricated by the spraying method. The interfacial nucleation and adhesion of hydrates on substrates were studied from a microscopic perspective. The coating exhibited excellent repellencies to various liquids, including water, edible oil, liquid paraffin, vacuum pump oil, n-hexadecane, and crude oil. The tetrabutylammonium bromide (TBAB) hydrate is readily nucleated on the bare Cu surface. In contrast, the coated substrate effectively inhibited the hydrate nucleation on the surface and even reduced the adhesion force to 0 mN/m. Furthermore, this coating was fouling- and corrosion-resistant and can maintain an ultralow hydrate adhesion force even after immersion in crude oil or TBAB solution for 20 and 300 d, respectively. The durable anti-hydrate performance of the coating was attributed mainly to the unique architecture and excellent amphiphobic properties enabling stable air cushions between the solid–liquid interface.

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“…(a) Many scholars have published microimages of wax crystal morphology. However, especially under specific conditions or the action of PPDs, the development of wax crystal morphology is complex, and its contribution to changes in system fluidity is not completely clear. − (b) An increasing number of scholars have observed that, in addition to the influence of wax crystal morphology, the interaction between wax crystals is critical in determining macroscopic rheological properties of oil. − However, current research methods cannot effectively explore these properties and mechanics performance. (c) Scholars pay much attention to the simultaneous measurement of waxy crude oil rheology and microstructure.…”

Section: Introductionmentioning

confidence: 99%

Application of Rheo-optic In Situ Measurement Technology to Study Waxy Crude Oil Rheology

Dong

Zhao

et al. 2022

ACS Omega

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The micromechanism of waxy crude oil gelling is the interaction between wax crystals to form a certain intensity flocculation structure, which significantly increases the cost of production and transmission. In this paper, rheo-optic in situ measurement technology is applied to the rheological study of waxy crude oil for the first time and also to the rheological response of typical waxy crude oil to thermal history, the micromechanism of shear-thinning, and the dynamic behavior of wax crystal. Through the new experimental technique and analysis method, it is found that two types of wax crystals can be formed under certain thermal historical conditions, which have opposite performances in microscopic morphology, mechanic properties, and flocculation tendency, and the change of its proportion in crude oil is the root cause of the initial cooling temperature affecting the fluency of waxed crude oil. It was found that the microscopic behavior of waxy crude oil with the increase of shear rate went through the following whole process: the waxy crude oil system changes from static to dynamic, the wax crystal flocculation network undergoes deformation, cracks, and ruptures, and wax crystal aggregates break, small aggregates orient along the flow field, and small aggregates continues to deform and break. When the shear rate is below 5 s –1 , the crack of the flocculation structure plays a leading role. It is only after the shear rate exceeds 5 s –1 that the deformation of the wax crystal and its flocs begins to function. Furthermore, according to the microscopic images of the wax crystals motion sequence, the micromorphology of different types of flocs and the dynamic behaviors under shearing are systematically analyzed by dynamic micro-object capture technology.

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Effect of the Ethylene Vinyl Acetate Copolymer on the Induction of Cyclopentane Hydrate in a Water-in-Waxy Oil Emulsion System

Cited by 5 publications

References 56 publications

Effect of Polymethylsilsesquioxane (PMSQ) Microspheres on Cyclopentane Hydrate Formation in Waxy Oil–Water Systems

Effect of Polymethylsilsesquioxane (PMSQ) Microspheres on Cyclopentane Hydrate Formation in Waxy Oil–Water Systems

Multifunctional Amphiphobic Coating toward Ultralow Interfacial Adhesion of Hydrates

Application of Rheo-optic In Situ Measurement Technology to Study Waxy Crude Oil Rheology

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