In general the pressure of oil wells is sufficient in order to deliver the oil mixtures for example to an offshore platform in the proximity. Without use of platforms the multiphase pumps are arranged directly at the well. The mixtures are compressed to high pressures to transport them over large distances and to combine them with other streams for central separation and further processing. Multiphase pumps are used not only individually but also in pipeline networks. The pumps are then installed in serial connection, in order to transport over large distances or in parallel connection, in order to transport larger mass flows. Multiphase pumps are used in the oil and natural gas producing and processing industry to deliver multiphase mixtures directly. The mixtures consist of liquid and gaseous hydrocarbons, water, as well as particles, e.g. sand or crystalline hydrates. The experimentally and theoretically investigated twin screw pumps are displacement pumps, which work with two axially parallel and inversely rotating screws. Slug flow often occurs in pipeline systems. By this unsteady flow pipes and fittings are stressed. How the multiphase pump is affected by slug flow is investigated. Therefore an unsteady flow regime is created where the gas volume fraction is altered between 0 and 1. The flow regime is detected using a three beam gamma densitometer. The operation parameters of the pump and the gamma transmissions are saved with a temporal resolution of 100 Hz. The comparison between measurements and the presented model shows that the delivering characteristic of multiphase screw pumps can be predicted. For pumping of mixtures with high gas fractions above 0.95 cooling of the pump has to be taken into account. The volumetric efficiency can be increased for high gas fractions by recirculation of liquid. For unsteady boundary conditions like slug flow both experiments and calculations show that screw pumps can be operated independently of the gas fraction at the pump inlet. Measurement and calculation results show that the multiphase screw pump is not affected seriously by sudden changes of inlet gas fraction. Pressure peaks are neither calculated within the pump nor measured at inlet and outlet of the pump.


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    Title :

    Multiphase pumping for high gas contents and slug flow


    Contributors:
    Vauth, T. (author) / Rausch, T. (author) / Reichwage, M. (author) / Mewes, D. (author)


    Publication date :

    2005


    Size :

    14 Seiten, 10 Bilder, 12 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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