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- W2019156765 abstract "Multiphase flow is a central component in all flow assurance strategies in oil and gas production. The risk of plugging of flowlines due to hydrate formation is also one of the most prevailing flow assurance problems in subsea deepwater oil and gas operations. Hence, it is critical to develop a model to account for the inter-coupling of hydrates and multiphase flow. We present a new framework to model the effect of multiphase flow on hydrates and vice-versa. In the current work, we use a two-phase (gas/liquid) hydrodynamic slug flow model and explicitly incorporate hydrates as a third phase. The model is based on fundamental multiphase flow concepts and has the capability of predicting hydrodynamic slug formation and propagation in three-phase flow. The utility of this tool is demonstrated in the modeling of hydrate formation in gas-water and gas-oil-emulsified water systems by comparing the multiphase flow behavior in terms of flow regime, slug length distribution, number of slugs, and slug frequency. For the gas/oil system with emulsified water, we perform a systematic study on the aggregation of hydrate particles and the subsequent viscosification of the slurry, and its impact on the multiphase flow behavior of the system. The results reveal that hydrate formation has a significant effect on the slugging exhibited by the system, suggesting that one may be able to infer hydrate formation from the changes in the flow characteristics. As part of the validation of this model, we have performed an extensive comparison of the two-phase flow regime predictions of our model with available experimental data, as well as with a number of models available in literature. The results show that our model predictions are in good agreement with literature and the prediction accuracy of our model is higher than all the models compared. This establishes our model as a viable multiphase flow modeling tool to predict the flow behavior in oil and gas pipelines. Hence, in this work, we demonstrate the capabilities of the model to perform transient simulations of two-phase and three-phase flow. This is the first step in the development of the model, with the ultimate goal being completely understanding the interdependence of hydrates and multiphase flow, hence enabling flow assurance engineers to develop better hydrate management strategies." @default.
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- W2019156765 date "2015-05-04" @default.
- W2019156765 modified "2023-10-18" @default.
- W2019156765 title "Multiphase Flow Modeling for Gas Hydrates in Flow Assurance" @default.
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- W2019156765 doi "https://doi.org/10.4043/25729-ms" @default.
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