Wettability of Petroleum Pipelines: Influence of Crude Oil and Pipeline Material in Relation to Hydrate Deposition

Aspenes, Guro; Høiland, Sylvi; Borgund, Anna E.; Barth, Tanja

doi:10.1021/ef900809r

Cited by 23 publications

(17 citation statements)

References 38 publications

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“…The addition of surfactants into the system can lead to a reduction of liquid hydrocarbon–water and/or hydrate–liquid hydrocarbon interfacial tensions and can change the hydrate surface wettability by increasing the contact angle of a water droplet on the gas hydrate surface. ,− To study these effects, the interfacial tensiometer (IFT) was used to perform the pendent drop interfacial tension measurements. Because of the addition of AAs, all IFT values were obtained after the tests reached equilibrium, indicating the completion of the surfactant adsorption on the liquid hydrocarbon–water interface.…”

Section: Resultsmentioning

confidence: 99%

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Monteiro

et al. 2021

Langmuir

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Gas hydrate interparticle cohesive forces are important to determine the hydrate crystal particle agglomeration behavior and subsequent hydrate slurry transport that is critical to preventing potentially catastrophic consequences of subsea oil/gas pipeline blockages. A unique high-pressure micromechanical force apparatus has been employed to investigate the effect of the molecular structure of industrially relevant hydrate antiagglomerant (AA) inhibitors on gas hydrate crystal interparticle interactions. Four AA molecules with known detailed structures [quaternary ammonium salts with two long tails (R1) and one short tail (R2)] in which the R1 has 12 carbon (C12) and 8 carbon (C8) and saturated (C–C) versus unsaturated (CC) bonding are used in this work to investigate their interfacial activity to suppress hydrate crystal interparticle interactions in the presence of two liquid hydrocarbons (n-dodecane and n-heptane). All AAs were able to reduce the interparticle cohesive force from the baseline (23.5 ± 2.5 mN m–1), but AA-C12 shows superior performance in both liquid hydrocarbons compared to the other AAs. The interfacial measurements indicate that the AA with an R1 longer alkyl chain length can provide a denser barrier, and the AA molecules may have higher packing density when the AA R1 alkyl tail length is comparable to that of the liquid hydrocarbon chain on the gas hydrate crystal surface. Increasing the salinity can promote the effectiveness of an AA molecule and can also eliminate the effect of longer particle contact times, which typically increases the interparticle cohesive force. This work reports the first experimental investigation of high-performance known molecular structure AAs under industrially relevant conditions, showing that these molecules can reduce the interfacial tension and increase the gas hydrate–water contact angle, thereby minimizing the gas hydrate interparticle interactions. The structure–performance relation reported in this work can be used to help in the design of improved AA inhibitor molecules that will be critical to industrial hydrate crystal slurry transport.

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Section: Resultsmentioning

confidence: 99%

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Monteiro

et al. 2021

Langmuir

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“…In another study, Aspenes et al observed a similar relationship between surface free energy and hydrate deposition. 142 They found that surfaces with the lowest free energy, representing the strongest oil-wet property and having the lowest adhesion energy to water in crude oil, had the least hydrate deposition. They suggested a potential strategy for anti-hydrate deposition by using surfaces with strong interactions with additives in the fluids, which can result in absorption of the molecules on the surfaces and greatly lower the water adhesion energy and reduce hydrate deposition.…”

Section: Anti-hydrate Deposition Surfacesmentioning

confidence: 99%

Anti-gas hydrate surfaces: perspectives, progress and prospects

Wang

Xiao

et al. 2022

J. Mater. Chem. A

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“…The wettability of the system plays an important role in influencing hydrate plug formation. In other words, the oil-wet hydrate particles correlate with the lower hydrate plugging tendency …”

Section: Introductionmentioning

confidence: 99%

“…In other words, the oil-wet hydrate particles correlate with the lower hydrate plugging tendency. 7 Offshore oil and gas installations and transport systems are hugely expensive to develop and maintain, often costing more than US$ 1 billion 8 and costing US$ 1 million per mile for tackling hydrate plugging. 9 Thus, hydrate inhibition becomes a significant precursor to mitigate the issues associated with flow assurance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

2021

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Proper understanding of the interaction of individual components of crude oil with hydrate formation and dissociation is essential to design an effective mitigation strategy for hydrate blockage, especially in offshore flowlines. In this study, various isothermal methane hydrate formation and dissociation kinetics experiments have been carried out in oil-in-water dispersion systems to understand the effect of liquid hydrocarbons (such as n-heptane and toluene) and asphaltenes with varying concentrations at 8 MPa and 275.15 K. To correlate the results obtained from the kinetics experiments, solubility tests and interfacial tension measurements have also been carried out. It was observed that aromatic hydrocarbons (e.g., toluene) in the system led to less dissolution of methane gas as compared to alkanes (e.g., n-heptane). This, along with the more developed oil− water interface due to the lower density difference with water, made the system more vulnerable to hydrate formation, and it displayed secondary hydrate induction. The presence of asphaltenes in the oil−water system showed higher gas consumption during hydrate formation at lower concentrations, possibly due to flocculated asphaltene molecules at the oil−water interface acting as nucleation sites for hydrate formation. As the concentration of asphaltene increases, the growth of hydrate crystals is found to be limited, as more asphaltene molecules tend to restrict the gas diffusion toward the water phase, controlling the growth kinetics during hydrate formation. The hydrate dissociation experiments suggest that the presence of flocculated asphaltenes in the system has delayed the dissociation of methane hydrate crystals for some time. The findings of this study will help gain an insight into the interaction of asphaltene, alkanes, and aromatics on the kinetics of methane hydrate formation and dissociation suitable for flow assurance applications.

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Wettability of Petroleum Pipelines: Influence of Crude Oil and Pipeline Material in Relation to Hydrate Deposition

Cited by 23 publications

References 38 publications

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Structural Effects of Gas Hydrate Antiagglomerant Molecules on Interfacial Interparticle Force Interactions

Anti-gas hydrate surfaces: perspectives, progress and prospects

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

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