Investigation of gas hydrate formation and inhibition in oil-water system containing model asphaltene

Zi, Mucong; Wu, Guozhong; Wang, Jiang; Chen, Daoyi

doi:10.1016/j.cej.2021.128452

Cited by 25 publications

(14 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Asphaltenes solely were adsorbed at the surface of the water droplet due to the interfacial activity. It was reported that a fraction of asphaltenes formed hydrogen bonds with water molecules, which disturbed the hydrogen-bond network between water molecules, thus preventing the transformation of part of water into hydrate structures and inhibiting hydrate formation . Therefore, waxy emulsions containing a low content of asphaltene were less favorable for hydrate formation, specifically by increasing the induction period as well as by reducing the conversion ratio of water.…”

Section: Resultsmentioning

confidence: 99%

Influence of Asphaltenes on Hydrate Formation and Decomposition in Water-in-Waxy Oil Emulsions

et al. 2022

View full text Add to dashboard Cite

The formation of hydrate increases the uncertainty of the flow system in subsea multiphase transportation pipelines. Waxes and asphaltenes have been found to influence hydrate formation, but the detailed mechanism of their interaction remains unclear. A labscale high-pressure stirring reactor was used to analyze the influence of asphaltenes on CO 2 hydrate evolution behavior in waxy water-inoil (W/O) emulsions. Results demonstrated that waxes inhibited CO 2 hydrate nucleation. The addition of asphaltenes promoted the inhibition effect of waxes, and the enhancement effect was nonmonotonic with the asphaltene contents increased. Based on microscopic observation and wax precipitation characteristics, this behavior could be interpreted as the competitive effect of increased adsorption of wax crystals on the surface of the droplets and reduced amount of wax precipitation. Moreover, asphaltenes were found to facilitate the decomposition process of CO 2 hydrates in waxy systems by decreasing the wax precipitation amount and stabilizing the emulsion. This work can provide potential engineering guidance for flow assurance applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Influence of Asphaltenes on Hydrate Formation and Decomposition in Water-in-Waxy Oil Emulsions

et al. 2022

View full text Add to dashboard Cite

show abstract

“…One of is the fugacity of the gas phase, which can be calculated by RK EOS, SRK EOS, PR EOS, PT EOS or BWRS EOS, see Appendix A1. The other is the Langmuir constant of gas, which can be calculated using eqn ( 5), (8) or (10). The specic calculation steps are as follows, and the solution ow is shown in Fig.…”

Section: Model Solutionmentioning

confidence: 99%

“…[3][4][5] However, in the oil-gas eld, the formed natural gas hydrates will cause device blockage and pose a serious threat to oil-gas production, transportation, and processing. [6][7][8][9][10] Therefore, accurate and reliable hydrate phase equilibrium prediction is necessary for natural gas hydrate exploitation and essential for improving natural gas separation technology and preventing blockage of oil and gas pipelines.…”

Section: Introductionmentioning

confidence: 99%

Applicability research of thermodynamic models of gas hydrate phase equilibrium based on different equations of state

Zhang

Liu

et al. 2022

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Gas hydrate is a solid crystal with an extremely high capacity for gas storage and a unit volume of gas hydrate can store 160-180 unit volumes of gas at standard temperature and pressure [3][4][5][6][7]. Gas hydrate has wide application in many fields, such as energy storage, gas transportation, gas separation, carbon dioxide storage, and seawater desalination [2,[8][9][10][11]. In addition, gas hydrate is also a crucial unconventional energy source with huge reserves, and the total amount of natural gas contained in hydrate reservoirs currently distributed on the seabed and permafrost is 1-120 × 10 15 m 3 [3,12,13].…”

Section: Introductionmentioning

confidence: 99%

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Liu

Zhan

et al. 2022

Water

View full text Add to dashboard Cite

The formation process, structure, and distribution of gas hydrate in sediments have become focal points in exploring and exploiting natural gas hydrate. To better understand the dynamic behavior of gas hydrate formation in sediments, transverse relaxation time (T2) of nuclear magnetic resonance (NMR) is widely used to quantitatively characterize the formation process of gas hydrate and the change in pore characteristics of sediments. NMR T2 has been considered as a rapid and non-destructive method to distinguish the phase states of water, gas, and gas hydrate, estimate the saturations of water and gas hydrate, and analyze the kinetics of gas hydrate formation in sediments. NMR T2 is also widely employed to specify the pore structure in sediments in terms of pore size distribution, porosity, and permeability. For the recognition of the advantages and shortage of NMR T2 method, comparisons with other methods as X-ray CT, cryo-SEM, etc., are made regarding the application characteristics including resolution, phase recognition, and scanning time. As a future perspective, combining NMR T2 with other techniques can more effectively characterize the dynamic behavior of gas hydrate formation and pore structure in sediments.

show abstract

Investigation of gas hydrate formation and inhibition in oil-water system containing model asphaltene

Cited by 25 publications

References 28 publications

Influence of Asphaltenes on Hydrate Formation and Decomposition in Water-in-Waxy Oil Emulsions

Influence of Asphaltenes on Hydrate Formation and Decomposition in Water-in-Waxy Oil Emulsions

Applicability research of thermodynamic models of gas hydrate phase equilibrium based on different equations of state

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Contact Info

Product

Resources

About