As a result of the problem of hydrate in multiphase pipelines in offshore production is becoming
more and more severe with the increasing of the water depth, the study on oil-gas-water-hydrate
has became a hot point of multiphase flow. In this paper, the hydrate particle and liquid phase was
treated as pseudo-fluid, the steady hydraulic, thermodynamical and phase equilibrium calculation
method of gas-hydrate slurry was developed. Comparison was carried out between calculated data
and experimental data from flow loop in our laboratory.
With strict flash calculation the following items were determined: the amount of hydrate; phase
number; the location that hydrate appeared; flowrate and molar component of gas phase and
liquid phase. Then thermodynamic quantities were carried out with proper relational expression.
When Compositional model is used to simulate two phase flow, it is required to couple mass,
momentum, energy equation and equation of state. In the other word, the parameters in these four
equations are interacted. However they are all the functions of p, T and z. In steady condition, it’s
assumed that the composition of fluid is unchangeable along the pipeline and the flow can be
described by pressure and temperature. In this paper, calculation method of gas-liquid two phase
flow which respectively was improved. Liquid holdup and pressure drop were calculated by
momentum equation. Enthalpy balance equation was substituted by explicit formulation of
temperature calculation which meant that the loop of temperature was not required.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/1107 |
| Date | 07 1900 |
| Creators | Gong, Jing, Zhao, Jian-Kui |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
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