Transport of hydrate slurry at high water cutReport as inadecuate

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* Corresponding author 1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels 2 PROPICE-ENSMSE - Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements 3 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel 4 CSTJF - Centre scientifique et Technique Jean Feger

Abstract : Oil transportation in pipelines at the end of field production life implies to flow high quantities of water which represents the dominant phase. The process of crystallization of gas hydrates in this system needs to be studied and compared to the opposite one widely studied in the literature where water is the dispersed phase. The laboratory is equipped with the Archimede flow loop where the hydrate crystallization and transport are monitored. The flow loop is equipped with pressure and temperature probes, to observe the transport with differential pressure drop probes, with an FBRM probe Focused Beam Reflectance Measurements, an ATR probe IR measurement and a PVM probe Particle Video Microscope. We have performed a parametric study based on the water content 60% - 90%, and liquid flow rates 200L-h and 400L-h in order to observe the crystallization of methane hydrates from an emulsion of liquid Kerdane C11 - C14 and liquid water. A set of experiments without and with commercial AA-LDHI Anti- Agglomerant - Low Dosage Hydrate Inhibiter were compared. For experiments without AALDHI, when the amount of hydrates reaches a critical zone, flow is stopped by either impossibility to transport too viscous slurry or hydrates sticking to the flow loop walls. In experiments with AA-LDHI we observe the benefice of adding a chemical dispersant to maintain flow and prevent instabilities.

Keywords : AA-LDHI pipelines high water cut dispersant gas hydrates flow assurance

Author: Aline Melchuna - Ana Cameirão - Jean-Michel Herri - Yamina Ouabbas - Philippe Glenat -



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