About 15% of failures in oil and gas production are caused by erosion corrosion at components with reduced flow diameters, like gravel packs, nozzles and Christmas trees. Production rates are often limited by critical fluid velocities, depending on critical erosion corrosion rates. Those critical fluid velocities and erosion corrosion rates respectively are reported rarely in literature especially for highly alloyed materials. Reasons are on the one hand that determination of such values is experimentally highly sophisticated when avoiding destruction of the testing facility. On the other hand, conventional erosion corrosion testing facilities (rotating cylinders, discs, etc.) supply in many cases poorly defined conditions especially with respect to flow velocity. Most erosion corrosion tests are therefore done at low flow velocities below 10 m/s which do not sufficiently attack corrosion resistant alloys. A combined flow loop - jet impingement pilot plant has been established to determine erosion corrosion rates in a mixed gas - saltwater - sand multiphase flow at velocities up to 70 m/s. As liquid phase an artificial brine with a salt content of 27 g/l was used. Sand content with grain size below 150 micron was up to 80 times higher than field conditions to accelerate testing. CO2 with a partial pressure of 15 bar was used as gas phase. Rectangular stainless steel discs with a size of 20 x 15 x 5 mm were used as specimens. Damaged surfaces of specimens exposed to the high velocity multi phase flow were investigated by scanning electron microscopy (SEM) and an optical device for 3D surface measurements. Examples for erosion corrosion rates at different impact velocities are presented for two austenitic stainless steels (1.4301 / UNS S30400 and 1.4563 / N08028). Those erosion corrosion rates are critically discussed and compared to real field degradation rates.


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    Titel :

    Erosion corrosion rates of stainless steels in a high velocity multi phase flow


    Weitere Titelangaben:

    Erosionskorrosionsgeschwindigkeit bei den nichtrostenden Stählen in einer Hochgeschwindigkeits-Multiphasenströmung


    Beteiligte:
    Joachim, Haberl (Autor:in) / Mori, G. (Autor:in) / Oberndorfer, M. (Autor:in) / Havlik, W. (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    15 Seiten, 8 Bilder, 6 Tabellen, 26 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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