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EXTENDED MODELLING OF MULTIPHASE FLOW IN OIL AND NATURAL GAS PIPE SYSTEMS

Ziel

The aim of the project is to extend the existing knowledge of multiphase flow analysis in hydrocarbons fluid systems, and to develop this knowledge, in order to provide the Natural Gas and Oil Industry improved predictive tools, such as modelling methods, data banks and computational support.
The innovative aspect of the proposed project is that it will attempt to apply a sounder scientific approach to a difficult and complex subject such as three-phase flow modelling and two-phase steady or transient flow analysis in pipelines and pipe networks.L%
Results of specific test cases available. Already validated codes ready for industrial applications.
The project work has been divided into five main phases :
1. Three-phase oil-water-gas flow.
2. Three-phase gas-liquid-solids flow.
3. Transient two-phase flow.
4. Two-phase flow in pipe networks.
5. Project Assessment, Documentation and Management.
PHASE I THREE-PHASE OIL-WATER-GAS FLOW
Work under this phase of the project has reached its conclusion. Existing and current work on three-phase flows has been reviewed. From this work, a database of three-phase flow data has been constructed, covering a wide range of conditions. The database has been supplemented by an experimental programme of study of three-phase flow carried out using the WASP multiphase flow facility at London. Models for specific features of three-phase flows have been developed and, have been incorporated in a code for prediction of three-phase flow behaviour.
PHASE 2 THREE-PHASE GAS-LIQUID-SOLIDS FLOW
Two of the most suitable models and correlations have been coded and tested against experimental and publisheddata. Thus the work in this phase has been extended towards considerable modifications of the algorithms, while the validation of the developed codes has been performed through appropriate test cases. Both models along with the self-developed model worked out in this project have been included into an validated integrated code. Future trials regarding the solids influence on three-phase systems have been assessed and a new code has been generated. The physico-mathematical modelling leads to a system of differential equations which are solved numerically.
PHASE 3 TRANSIENT TWO-PHASE FLOW
This phase of the project concerns the development of a numerical code for the prediction of transient two-phase flows in pipelines. The skeleton numerical solver of the code is derived from the nuclear safety code TRAC but application to two-phase flows in hydrocarbon pipelines has required the development of several features of the code. In particular, a thermophysical properties package for hydrocarbon properties has been integrated with the code, the models for description of the two-phase flow pattern maps and friction factors have been improved and models have been added for the calculation of phase change and critical flow.
PHASE 4 TWO-PHASE FLOW IN PIPE NETWORKS
The structure of the code for fluid dynamic analysis of two-phase flow in complex pipe networks has been created, using the methodology and the global structure of an already completed code for realistic single-phase pipe networks. The one-dimensional, isothermal steady and transient pipeline flow has been extended into the application range of two-phase oil- gas flow systems. The extension was partly performed using two-phase flow analysis tools, such as experimental derived correlations or models for the prediction of the two-phase flow pattern and pressure drop. Regarding the unsteady two phase flow a code has been developed for annular, stratified and bubble flow analysis. The validation process has beencompletd.

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ALFAPI SA
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Institute of computational engineering vasileos georgiou avenue 41
11634 Athens
Griechenland

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