In this work a new simulation tool named MAST (Multiphase flow Analysis and Simulation of Transitions) is used for the analysis of gas-liquid and gas-liquid-liquid pipeline flow under unsteady or transient flow conditions. The two-phase, isothermal version of the code is described in details in a preceding paper. The present version of the code considers the presence of three phases (gas-liquid-liquid) and six flow fields (dispersed and continuous gas and liquid phases) and is based on the numerical integration by an explicit method of the mass, momentum and energy conservation equations. The main characteristic of the MAST code is its capability of describing the different flow patterns (Stratified, Slug, Bubble and Annular) and the transitions among them as fully dynamic processes governed by the conservation equations and the closure relations adopted. This feature of the code represents a deep change with respect to the pseudo-steady state description of the various flow regimes, coupled with the use of empirical flow transition rules adopted by the available commercial codes. In this paper, the dynamic features of the code are validated against a set of measurements relative to gas-liquid slug flow in a 400 m long, 0.2 m ID pipe and the code is used to interpret field data relative to an existing pipeline 27.5 km long, 0.4 m ID operating in a pressure range between 70 and 35 bar, used for the transportation of well fluids (gas, oil and water) from the producing wells to the separation unit.
Advanced simulation of gas-liquid pipelines
Verbesserte Simulation von Gas-Flüssig-Pipelines
2008
15 Seiten, 5 Bilder, 1 Tabelle, 23 Quellen
Conference paper
English
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