A computer program called the 'Trunkline Monitoring System' has been developed to track the evolution of a mixture of wet gas feedstock compositions and associated condensate by-products that travel through a two-phase offshore trunkline to onshore gas processing facilities. The program helps operators of gas processing facilities control the quality of sales gas and keep it within contractual limits. That is typically perfomred by adjusting the flow rates of one or more producer platforms in a timely fashion to compensate for unexpected and-or unavoidable flow fluctuations in other producing platforms. The tool provides operators with the necessary information to decide the best operational action and the optimum timing for its implementation. The tool is a 'soft' sensor to complement facility measurements with information that in practice cannot be obtained by direct measurement, for example trunkline condensates inventory, gas composition, and Wobbe index at different trunkline locations. It also is a predicitive platform to investigate what-if or look-ahead scenarions, for example to analyze the influence of future flow changes on gas quality and liquid production. The system uses a combination of AspenTech, Shell, and a third-party technology. The simulation platform consists of AspenTech's Hysys Dynamics as flowsheeting program, HYFLOW as transient multiphase trunkline model, and HYSPPTS as thermodynamic engine. PI from OSI software Inc. is used as the source of the online data (data historian), and ProcessBook, also from OSI Software, is the framework hosting the system graphical interfaces.


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    Title :

    Program tracks wet gas feedstocks through two-phase offshore trunkline


    Additional title:

    Ein Softwareprogramm zur Überwachung von Zweiphasenströmen in Offshore-Pipelines


    Contributors:

    Published in:

    Oil and Gas Journal ; 103 , 14 ; 54-59


    Publication date :

    2005


    Size :

    6 Seiten, 10 Bilder, 2 Tabellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English