Experimental study and modelling on methane hydrates crystallization under flow from a water-oil dispersion at high water cut ; Etude expérimentale et modélisation de la cristallisation d'hydrates de méthane en écoulement a partir d'une dispersion eau-huile a fort pourcentage d'eau
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Media type:
E-Book
Title:
Experimental study and modelling on methane hydrates crystallization under flow from a water-oil dispersion at high water cut ; Etude expérimentale et modélisation de la cristallisation d'hydrates de méthane en écoulement a partir d'une dispersion eau-huile a fort pourcentage d'eau
imprint:
[Erscheinungsort nicht ermittelbar]: HAL CCSD, 2018
Language:
English
Origination:
University thesis:
Dissertation, HAL CCSD, 2018
Footnote:
Description:
Production of crude oil with natural gas and water at low temperature and high pressure favors conditions for gas hydrate formation which might cause many troubles in flow assurance, up to blockage of pipelines. To prevent plugging, varieties of methods are applied to flowlines by addition of thermodynamic inhibitors (THIs), kinetic hydrate inhibitors (KHIs) and anti-agglomerants (AAs). Recently, AAs are more widely used due to not only their high performance at severe conditions but also the reduction in costs of operation at low dosage (AA-LDHIs). Mostly, previous studies on gas hydrate formation and transport have focused on low water cuts and without anti-agglomerants. On the contrary, at high water cuts, the gas hydrate formation and transport in the presence of AA-LDHI and/or salt in pipelines are not widely understood. The principal objective of this study is a better understanding on hydrate formation and plugging by testing the role of commercial additives to avoid plugging. In details, this work deals with hydrate kinetics of crystallization and agglomeration together with hydrate slurry transport and deposition under flowing conditions (especially at high water cuts). Effects of various parameters were studied, including the amount of commercial anti-agglomerants (AA-LDHIs), water volume fraction, and water salinity in a mixture of Kerdane® oil and water. The experiments were performed in the Archimède" 80 bar - pilot scale flowloop which reproduces the conditions in oil and gas transport in subsea pipelines. The experimental apparatus is equipped with a FBRM (Focused Beam Reflectance Measurement) and a PVM (Particle Video Microscope) probe and temperature, pressure drop, flowrate and density sensors. The flow was induced through Moineau pump and/or a "gas-lift" system. The results revealed that with gas-lift protocol