Natural gas hydrate formation and inhibition in gas/crude oil/aqueous systems

Daraboina, Nagu; Pachitsas, Stylianos; Solms, Nicolas von

doi:10.1016/j.fuel.2015.01.103

Cited by 115 publications

(70 citation statements)

References 39 publications

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“…Luvicap-Bio, a biodegradable commercial kinetic hydrate inhibitor, was used in a set of experiments containing 30% crude oil (fractional composition of crude by SARA analysis (0.8515 g/cc) was paraffins 51; aromatics 9; resins 4 and asphaltenes 36) (Pachitsas, 2014) and natural gas as the hydrate former. The results of these tests indicated that the nucleation inhibition strength of Luvicap-Bio decreased in the presence of crude oil compared to the same non-crude containing sample (Daraboina et al, 2015). In another study conducted by Sharifi et al (2013), a similar result was also attained upon the addition of n-heptane (liquid hydrocarbon) to solutions of PVP and PVCap (Sharifi et al, 2013).…”

Section: Accepted Manuscriptmentioning

confidence: 82%

“…Although no other studies to date have shown initial uninhibited hydrate growth with KHI's, some studies have shown a decrease in nucleation efficiency (reduction of nucleation inhibitor strength). In a study conducted by Daraboina et al (2015), a rocking cell was used in order to determine natural gas hydrate formation and inhibition effects using a gas/crude oil/aqueous system (Daraboina et al, 2015). Luvicap-Bio, a biodegradable commercial kinetic hydrate inhibitor, was used in a set of experiments containing 30% crude oil (fractional composition of crude by SARA analysis (0.8515 g/cc) was paraffins 51; aromatics 9; resins 4 and asphaltenes 36) (Pachitsas, 2014) and natural gas as the hydrate former.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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The effect of high driving force on the methane hydrate-polyvinylpyrrolidone system

Posteraro

Verrett

Marić

et al. 2016

Journal of Natural Gas Science and Engineering

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Section: Accepted Manuscriptmentioning

confidence: 82%

Section: Accepted Manuscriptmentioning

confidence: 99%

The effect of high driving force on the methane hydrate-polyvinylpyrrolidone system

Posteraro

Verrett

Marić

et al. 2016

Journal of Natural Gas Science and Engineering

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“…Clathrate hydrate crystals consist of cages composed of water molecules, stabilized by other, small, molecules trapped inside the cages as guest molecules [1][2][3][4] . If a guest molecule is too large to fit in a cage, semi-clathrates may be formed by connecting ionic guests and water molecules as hosts and with the cation embedded into the cages as a guest.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Growth Kinetics of Tetra-n-butylammonium Bromide Hydrate Formation in Small Spaces

et al. 2019

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Kinetics of tetra-n-butylammonium bromide (TBAB) hydrate formation orientated within the space of a small dimension tube is investigated through microscopic experiments in the temperature range-5.5 o C to-9.7 o C. Based on the experimental data, a kinetic model in small dimensional space is proposed to describe formation process. Hydrate crystals are observed uniformly growing in small dimensional space. The experimental results show that the nucleation time of TBAB hydrate increases from 9 min to 25 min and linear growth rate decreases from 16.36 m/s to 9.66 m/s with increasing temperature. Crystal morphologies show that the tube wall has less effect on the inner crystal growth, when the temperature is lower. Furthermore, the number of nucleation sites increase under even lower temperature. The varying degree of brightness of the crystals indicates that there is a variation of facets of hydrate crystal formed at different temperatures. Hydrate crystals under lower temperature exhibit more growth points and the linear growth rate of crystals in tube is larger than that in bulk because of heat-transfer effects. A negative activation energy during hydrate formation in this study is obtained according to kinetic equation to be-58.27 kJ/mol.

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“…Also, the application of computational fluid dynamics (CFD) increased and a prediction model is proposed to evaluate the particle deposition on the pipeline walls during gas hydrates formation 19 . The development and proposal of hydrodynamic models to predict the gas hydrates formation in multiphase pipelines eased the path for advanced research studies 20 . There is an upsurge in the experimental investigation and analysis as most of the numerical modelling as well as simulations by commercial software's are to be validated by experimental data or real time field data 21 .…”

mentioning

confidence: 99%

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Sayani

Pedapati

Lal

2020

Sci Rep

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This research is focused on understanding the phase behavior of gas hydrate formation in the gas dominant multiphase pipelines containing mixed gas with high CO2, crude oil, and deionized water. The experimental conditions are in the pressure range of 3–7 MPa with water cut as 20% of the volume. Initially, the effect of high CO2 content in natural gas on the phase boundary conditions of hydrates is studied through simulation (CSMGEM software) and experiments. Later, an additional phase of crude oil was introduced, with 15% of the volume to study the multiphase system. From the experimental analysis, thermodynamic equilibrium conditions were found, and the hydrate-liquid–vapor-equilibrium (HLVE) curves were drawn. The phase behavior is comprehended by comparing the HLVE curves of pure and multiphase systems. It is found that the high CO2 content tends to promote the gas hydrate formation. Based on the results, temperature variance and enthalpy of formation were calculated for the multiphase system. With a difference of 1.32 average temperature variance, the multiphase system exhibits inhibition. A basic statistical regression model was made to predict the gas hydrate formation in multiphase transmission pipelines. This work helps in understanding the effect of a new phase on gas hydrate formation.

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Natural gas hydrate formation and inhibition in gas/crude oil/aqueous systems

Cited by 115 publications

References 39 publications

The effect of high driving force on the methane hydrate-polyvinylpyrrolidone system

The effect of high driving force on the methane hydrate-polyvinylpyrrolidone system

Investigation of the Growth Kinetics of Tetra-n-butylammonium Bromide Hydrate Formation in Small Spaces

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

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