The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform

Colin D. Wood - One of the best experts on this subject based on the ideXlab platform.

  • Raman spectroscopic and kinetic analysis of hydrate shell formation on hydrogel particles containing monoethylene glycol
    Journal of Natural Gas Science and Engineering, 2017
    Co-Authors: J.h. Park, Hyunho Kim, Yutaek Seo, Wendy Tian, Colin D. Wood
    Abstract:

    Abstract Hydrate shell growth on hydrogel particles incorporating monoethylene glycol (MEG) was investigated using Raman spectroscopy and a high pressure autoclave apparatus. Surface images of hydrogel particles covered by a hydrate shell are presented and the obtained Raman spectra indicate MEG molecules were excluded from the formation of the hydrate shell. The Raman spectra and surface imaging of the particles demonstrate that the particles remain intact after the dissociation of the shell. In subsequent hydrate formation cycles, the hydrate fraction in the Liquid Phase was determined from gas consumption measurements in a high pressure autoclave. The hydrate fraction reached only 0.11 for hydrogels containing MEG while a high hydrate fraction of 0.41 was observed for a control system consisting of bulk water and decane mixture. The growth rate in the presence of hydrogel particles was suppressed in the early stages of hydrate formation, suggesting that the increasing MEG concentration inside the hydrogel core may limit the further inward hydrate growth. After hydrate formation the hydrogel particles were analyzed by thermogravimetric analysis (TGA), suggesting the possibility of recovering hydrogel polymer through conventional heating methodologies. These results demonstrate that injecting hydrogel particles containing high concentration of MEG may be feasible to manage the risk of hydrate plug formation as they will absorb the free water resulting in the dispersed hydrogel particles among the Hydrocarbon Liquid Phase.

Arne Olav Fredheim - One of the best experts on this subject based on the ideXlab platform.

  • Phase equilibrium calculations for unprocessed well streams containing hydrate inhibitors
    Fluid Phase Equilibria, 1996
    Co-Authors: Karen Schou Pedersen, Michael Locht Michelsen, Arne Olav Fredheim
    Abstract:

    Abstract It is shown that the Phase distribution of methanol and water between a Hydrocarbon gas Phase, a Hydrocarbon Liquid Phase and an aqueous Phase can be represented using the Soave-Redlich-Kwong equation with a non-conventional mixing rule for the a -parameter suggested by Huron and Vidal. Model parameters are estimated from data for binaries of the type methanolHydrocarbon and waterHydrocarbon. New experimental data are presented for two reservoir fluids and for one model system. The paper further presents a Phase equilibrium algorithm for calculating the Phase boundaries and the equilibrium compositions at the Phase boundary for a system consisting of a gas, a Liquid and a mixed aqueous Phase.

J.h. Park - One of the best experts on this subject based on the ideXlab platform.

  • Raman spectroscopic and kinetic analysis of hydrate shell formation on hydrogel particles containing monoethylene glycol
    Journal of Natural Gas Science and Engineering, 2017
    Co-Authors: J.h. Park, Hyunho Kim, Yutaek Seo, Wendy Tian, Colin D. Wood
    Abstract:

    Abstract Hydrate shell growth on hydrogel particles incorporating monoethylene glycol (MEG) was investigated using Raman spectroscopy and a high pressure autoclave apparatus. Surface images of hydrogel particles covered by a hydrate shell are presented and the obtained Raman spectra indicate MEG molecules were excluded from the formation of the hydrate shell. The Raman spectra and surface imaging of the particles demonstrate that the particles remain intact after the dissociation of the shell. In subsequent hydrate formation cycles, the hydrate fraction in the Liquid Phase was determined from gas consumption measurements in a high pressure autoclave. The hydrate fraction reached only 0.11 for hydrogels containing MEG while a high hydrate fraction of 0.41 was observed for a control system consisting of bulk water and decane mixture. The growth rate in the presence of hydrogel particles was suppressed in the early stages of hydrate formation, suggesting that the increasing MEG concentration inside the hydrogel core may limit the further inward hydrate growth. After hydrate formation the hydrogel particles were analyzed by thermogravimetric analysis (TGA), suggesting the possibility of recovering hydrogel polymer through conventional heating methodologies. These results demonstrate that injecting hydrogel particles containing high concentration of MEG may be feasible to manage the risk of hydrate plug formation as they will absorb the free water resulting in the dispersed hydrogel particles among the Hydrocarbon Liquid Phase.

Alireza Bahadori - One of the best experts on this subject based on the ideXlab platform.

  • estimation of hydrate inhibitor loss in Hydrocarbon Liquid Phase
    Petroleum Science and Technology, 2009
    Co-Authors: Alireza Bahadori
    Abstract:

    The amount of hydrate inhibitor to be injected in the gas processing and transmission system to avoid hydrate formation not only must be sufficient to prevent freezing of the inhibitor in the water Phase but also must be sufficient to provide for the equilibrium vapor Phase content of the inhibitor and the loss of the inhibitor in any Liquid Hydrocarbon. In this article, a new numerical algorithm is developed for estimation of loss of methanol in paraffinic Hydrocarbons at various temperatures and methanol concentrations in the water Phase The predicted values showed good agreement with the reported data. The solubility of methanol in paraffin Hydrocarbons is calculated for temperatures in the range of 240° to 320°K and methanol concentrations up to 70% in the water Phase, where the average absolute deviation is around 4%.

Abbas Firoozabadi - One of the best experts on this subject based on the ideXlab platform.

  • anti agglomeration of natural gas hydrates in Liquid condensate and crude oil at constant pressure conditions
    Fuel, 2016
    Co-Authors: Huangjing Zhao, Abbas Firoozabadi
    Abstract:

    Abstract An effective anti-agglomerant (AA) can reduce capillary force between hydrate particles to prevent them from sticking together, therefore preventing the blockage in pipelines. In recent studies, we have reported an AA formulation which shows high effectiveness at low dosage in methane/natural gas hydrates over the entire water-cut range. All our past work, however, was conducted in a closed rocking cell system with n -octane as the Hydrocarbon Liquid Phase. In this work, we investigate the effectiveness of an improved formulation in various systems at constant high pressure (∼100 bar natural gas) and high cooling rate (−8 °C/h) over the water-cut range of 30–80%. Condensate Liquid and crude oil are used as the Hydrocarbon Liquid Phase. Because of the impact of the acidic gases in natural gas, a small amount of lithium hydroxide is included in the new formulation. Lithium hydroxide is more efficient than sodium hydroxide which was used in our previous studies. The dosage is reduced by ∼40% by mass. We demonstrate the effectiveness of improved AA formulation in an extensive set of measurements. The effect of salinity on the AA effectiveness is also investigated. It is found that increasing salinity can decrease the dosage of base chemical in the formulation significantly.