Investigation of Macroscopic Interfacial Dynamics between Clathrate Hydrates and Surfactant Solutions

Song, Jung Hun; Couzis, Alexander; Lee, Jae Woo

doi:10.1021/la103193m

Cited by 59 publications

(77 citation statements)

References 33 publications

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“…The impact of different concentrations of KHIs on interfacial tension/surface tension has been studied and no changes due to the concentration were observed. It has been reported that for the nonionic surfactants (PVP and PVCap) the interfacial tension remains almost constant independent of the concentration (Song et al, 2010). They observed almost constant contact forces for all concentrations (100 ppme5000 ppm) between cyclopentane hydrates and the surfactant solution.…”

Section: Contact Anglesmentioning

confidence: 95%

Oil and gas pipelines with hydrophobic surfaces better equipped to deal with gas hydrate flow assurance issues

Perfeldt

Sharifi

Solms

et al. 2015

Journal of Natural Gas Science and Engineering

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Section: Contact Anglesmentioning

confidence: 95%

Oil and gas pipelines with hydrophobic surfaces better equipped to deal with gas hydrate flow assurance issues

Perfeldt

Sharifi

Solms

et al. 2015

Journal of Natural Gas Science and Engineering

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“…22,[25][26][27][28] Hun et al also studied the interaction between hydrate particles and water in a temperature-controlled hydrocarbon environment utilizing an apparatus fabricated with a microbalance and z-axis stage. [29][30] Both groups explained the trends observed in the measured adhesion forces in terms of a capillary bridge formed between the contacting hydrate particles and/or hydrate particles and liquid droplets. More recently, Aspenes et al studied the adhesion forces between hydrate particles and a number of solid surfaces with various surface energies in the presence of water and/or other petroleum acids in an oil phase.…”

mentioning

confidence: 92%

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Sojoudi¹,

Walsh

Gleason³

et al. 2015

Langmuir

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Blockage of pipelines by formation and accumulation of clathrate hydrates of natural gasses (also called gas hydrates) can compromise project safety and economics in oil and gas operations, particularly at high pressures and low temperatures such as those found in subsea or arctic environments. Cyclopentane (CyC5) hydrate has attracted interest as a model system for studying natural gas hydrates, because CyC5, like typical natural gas hydrate formers, is almost fully immiscible in water; and thus CyC5 hydrate formation is governed not only by thermodynamic phase considerations but also kinetic factors such as hydrocarbon/water interfacial area and mass & heat transfer, as for natural gas hydrates. We present a macroscale investigation of the formation and adhesion strength of CyC5 hydrate deposits on bilayer polymer coatings with a range of wettabilities. The polymeric bilayer coatings are developed using initiated chemical vapor deposition (iCVD) of a mechanically-robust and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 densely-cross-linked polymeric base layer (poly-divinyl benzene or pDVB) that is capped with a covalently-attached thin hydrate-phobic fluorine-rich top layer (polyperfluorodecylacrylate or pPFDA). The CyC5 hydrates are formed from CyC5-in-water emulsions, and differential scanning calorimetry (DSC) is used to confirm the thermal dissociation properties of the solid hydrate deposits. We also investigate the adhesion of the CyC5 hydrate deposits on bare and bilayer polymer-coated silicon and steel substrates.Goniometric measurements with drops of CyC5-in-water emulsions on the coated steel substrates exhibit advancing contact angles of 148.3º ± 4.5º and receding contact angles of 142.5º ± 9.8º, indicating the strongly emulsion-repelling nature of the iCVD coatings. The adhesion strength of the CyC5 hydrate deposits reduced from 220±45 kPa on rough steel substrates to 20±17 kPa on the polymer-coated steel substrates. The measured strength of CyC5 hydrate adhesion is found to correlate very well with the work of adhesion between the emulsion droplets used to form the CyC5 hydrate and the underlying substrates.

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“…4 These four steps to plug formation include: (i) water entrainment in the oil phase, (ii) hydrate shell growth at the water-oil interface, (iii) hydrate aggregation, and (iv) accumulation/plugging of hydrate particles and aggregates. [14][15][16] This work aims to investigate the interaction between water droplets and cyclopentane hydrate particles using a micromechanical force (MMF) apparatus. 1 Specifically, Fidel-Dufour 5 proposed a conceptual mechanism for agglomeration, which suggests that the interactions between unconverted water droplets and hydrate particles will play an important role at the early stage of the agglomeration.…”

Section: Introductionmentioning

confidence: 99%

Direct measurements of the interactions between clathrate hydrate particles and water droplets

Liu

Zhang

et al. 2015

Phys. Chem. Chem. Phys.

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Clathrate hydrate particle agglomeration is often considered to be one of the key limiting factors in plug formation. The hydrate particle-water interaction can play a critical role in describing hydrate agglomeration, yet is severely underexplored. Therefore, this work investigates the interactions between water droplets and cyclopentane hydrate particles using a micromechanical force (MMF) apparatus. Specifically, the effect of contact time, temperature/subcooling, contact area, and the addition of Sorbitane monooleate (Span 80) surfactant on the water droplet-hydrate particle interaction behavior are studied. The measurements indicate that hydrate formation during the measurement would increase the water-hydrate interaction force significantly. The results also indicate that the contact time, subcooling and concentration of cyclopentane, which determine the hydrate formation rate and hydrate amount, will affect the hydrate-water interaction force. In addition, the interaction forces also increase with the water-hydrate contact area. The addition of Span 80 surfactant induces a change in the hydrate morphology and renders the interfaces stable versus unstable (leading to coalescence), and the contact force can affect the hydrate-water interaction behavior significantly. Compared with the hydrate-hydrate cohesion force (measured in cyclopentane), the hydrate-water adhesion force is an order of magnitude larger. These new measurements can help to provide new and critical insights into the hydrate agglomeration process and potential strategies to control this process.

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Investigation of Macroscopic Interfacial Dynamics between Clathrate Hydrates and Surfactant Solutions

Cited by 59 publications

References 33 publications

Oil and gas pipelines with hydrophobic surfaces better equipped to deal with gas hydrate flow assurance issues

Oil and gas pipelines with hydrophobic surfaces better equipped to deal with gas hydrate flow assurance issues

Investigation into the Formation and Adhesion of Cyclopentane Hydrates on Mechanically Robust Vapor-Deposited Polymeric Coatings

Direct measurements of the interactions between clathrate hydrate particles and water droplets

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