Synergism of thermodynamic hydrate inhibitors on the performance of poly (vinyl pyrrolidone) in deepwater drilling fluid

Zhao, Xin; Qiu, Zhengsong; Zhou, Guowei; Huang, Weian

doi:10.1016/j.jngse.2014.12.031

Cited by 69 publications

(32 citation statements)

References 29 publications

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“…With these observations, it can be safely concluded that mixed formulations of Inhibex 501 and MEG at these dosed concentrations appear to possess a certain additive effect with enhanced inhibition of hydrate nucleation. The results were consistent with other studies 11,32,40 and once again proved that MEG can act as a synergist for KHIs to promote the overall inhibition effect. The reason is probably that MEG would lower the fugacity coefficient of water 29 and change the hydrate phase boundary to a lower temperature via hydrogen bonding with water.…”

Section: Resultssupporting

confidence: 92%

“…Researchers ,, proposed using MEG as a synergist for KHIs to promote the overall inhibition effect for hydrate prevention. When mixing KHIs with MEG, the observed synergistic effect with reduced MEG dosage and maintained inhibition power could be seen as a joint effort from both sides.…”

Section: Resultsmentioning

confidence: 99%

“…A more practical and potentially cheaper solution for hydrate prevention or remediation is the injection of chemicals. This involves two major categories: thermodynamic hydrate inhibitors (THIs), such as methanol and glycol, − and low dosage hydrate inhibitors (LDHIs) covering mainly kinetic hydrate inhibitors (KHIs) and antiagglomerates (AAs). THIs are still widely used in industry with the ability of directly lowering the hydrate–liquid–vapor equilibrium (HLVE) temperature or increasing the HLVE pressure.…”

Section: Introductionmentioning

confidence: 99%

“…In industry, mixing varied petrochemicals can be useful to generate more effective formulations for different applications or circumstances. , In the aspect of avoiding hydrate formation and growth, many researchers mixed THIs with KHIs to reduce the amount of THIs used in operation; meanwhile, keeping an acceptable inhibitive effect. ,, Glycol ether compounds are one of the most studied types of synergists of KHIs . Kim et al found that the mixture of PVCap and MEG could reduce the concentration of MEG required for preventing hydrate formation with simulation and experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Mozaffar combined PVCap with THIs (MEG, methanol, and ethanol) and found that PVCap at increased concentrations had a synergistic effect with MEG for hydrate prevention. Zhao experimentally evaluated the influence of NaCl, glycol, and glycerol on the performance of PVP. The results indicated that NaCl could act as a synergist for PVP, while glycol and glycerol showed no obvious synergistic effect on the performance of PVP.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Yang¹,

Zhao³

et al. 2020

Energy Fuels

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Thermodynamic hydrate inhibitors (THIs) and kinetic hydrate inhibitors (KHIs) are widely studied and used in the oil & gas industry for hydrate prevention. In this experimental study, we applied an isothermal procedure and tested four different KHIspoly(vinylpyrrolidone) (PVP), Inhibex 501, Luvicap EG, and VC-713KHI−KHI mixtures, and KHI−MEG (monoethylene glycol) mixtures to evaluate their inhibitive performance on structure II methane−propane hydrate formation in stirred reactors. Two liquid systems (pure water and brine−oil−water), two cooling rates (6 and 4.5 K/h), and two subcooling levels (12.8 and 7.8 K) were examined. The results showed that, with single KHI dosing, Inhibex 501 has the best inhibitive effect in the pure water system, while Luvicap EG and VC-713 performed better in the brine−oil−water system. The performance of KHI−KHI mixtures was found to be similar to that of the single KHI composition of lower molecular weight. In experiments with KHI−MEG mixtures, MEG contributed to the combined inhibitive effect mostly for its thermodynamic effect on the system equilibrium; on the other hand, low concentration KHIs in the mixed formulations showed a synergistic effect that could not only reduce the dosage of MEG but also maintain the overall inhibitive effect on hydrate formation. The addition of NaCl and mineral oil may also prevent hydrate growth owing to water−salt ion interactions and interfacial barrier effects of the mineral oil.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Yang¹,

Zhao³

et al. 2020

Energy Fuels

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Heat transfer study in the exploitation of argillaceous‐silt natural gas hydrate reservoirs

Jiang

Song

Liu

et al. 2022

Energy Science & Engineering

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The paper investigates the heat transfer in the exploitation of offshore argillaceous-silt natural gas hydrate reservoirs considering sand control. The temperature prediction model is established in this investigation. The coupled pressure-temperature model of the flowing fluid inside the wellbore is also presented. The sand control for argillaceous-silt natural gas hydrate reservoirs mainly brings two effects into the temperature and pressure profiles simulation, including the moderate sand control and the Joule-Thompson effect. The moderate sand control is reflected by the volume and particle size of produced sand into the wellbore in the mathematical derivation. The Joule-Thompson is considered in the model due to the small diameter of sand control screens. The experiment is designed to measure the pressure drop caused by various mesh diameters of sand control screens. Subsequently, the regression relationship between the pressure drop and the mesh diameter is concluded to calculate the temperature change at the sand control screen. The simulation of heat transfer helps to analyze secondary hydrate formation risk in the wellbore. The proposed model identifies the high-risk location of the secondary hydrate formation. The sand control effect and well geometry effect are discussed quantitatively. The strict sand control in the argillaceous-silt natural gas hydrate (NGH) sediment exploitation reduces the risk of secondary hydrate formation significantly; however, it also has a negative effect on natural gas production. To balance the sand control and the prevention of secondary hydrate formation risk, it is suggested to install the heating electrode in the high-risk location to ensure flow safety with acceptable sand control precision. The heat provided by heat electrodes is calculated by the model presented in this paper. The model can be used to determine the proper arrangement of heat electrodes. The paper also describes the secondary hydrate formation by adjusting the well geometry. The formation depth of the NGH reservoir and the sea interval should be considered in the risk analysis of

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Gas Hydrate Inhibitors

Khan

Lal

Bustam

2019

Green Energy and Technology

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Synergism of thermodynamic hydrate inhibitors on the performance of poly (vinyl pyrrolidone) in deepwater drilling fluid

Cited by 69 publications

References 29 publications

Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Experimental Evaluation of Kinetic Hydrate Inhibitors and Mixed Formulations with Monoethylene Glycol for Hydrate Prevention in Pure Water and Brine–Oil Systems

Heat transfer study in the exploitation of argillaceous‐silt natural gas hydrate reservoirs

Gas Hydrate Inhibitors

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