Testing campaign has been performed to assess the applicability of the modified 13 % Cr martensitic stainless steels as tubing materials for the production wells of Smorbukk and Smorbukk South fields on the Asgard area of the North Sea. Due to well conditions, mainly the high temperatures (up to 165 deg C), the high concentrations of chlorides (up to 68 g/l) and the H2S partial pressure (1.8 kPa), sulphide stress cracking and localised corrosion resistance were the main concerns. The design requirements for the specified minimum yield strength of the tubing material were 95 ksi (655 MPa) and 110 ksi (758 MPa). Eight steels from three manufacturers with different chemical compositions (3.98 - 5.97 Ni, 11.89 - 12,85 Cr, 1.00 - 2.05 Mo, without Cu and with 1.49 or 1.60 Cu in wt.-%) have been tested. To assess their SCC (stress corrosion cracking) resistance constant load, four-point bent-beam and C-ring tests have been performed at room temperature. Furthermore, to assess the localised corrosion resistance of the material, pitting and crevice tests were performed at the highest temperature expected in service. The results of the tests have made it possible to decide the applicable materials. Grade 95 ksi and 105 ksi steels showed very good resistance to SCC and only one of the 110 ksi grad materials failed. The localised corrosion test results showed that the testing conditions were at the limit of the steel resistance.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Materials selection testing for the Asgard field well tubulars


    Additional title:

    Prüfungen zur Werkstoffauswahl für die Bohrrohre des Asgard-Feldes


    Contributors:
    Nice, P. (author) / Kopliku, A. (author) / Scoppio, L. (author)

    Published in:

    Stainless Steel World ; 9 , 6 ; 33-38


    Publication date :

    1997


    Size :

    6 Seiten, 6 Tabellen, 6 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    The Asgard Development

    Carlsen, H. / Huus, O. / Mosbergvik, O. | Tema Archive | 2000


    AOIP integre le groupe Asgard

    British Library Online Contents | 2003


    Comparison of ASGARD and UFOCapture

    R. C. Blaauw / K. S. Cruse | NTIS | 2011


    AZTEC/ASPID/ASGARD by Italdesign

    Perini,G. / Italdesign,IT | Automotive engineering | 1988


    Statoil's Asgard FPSO Floating Production Platform

    Ray, Elias | Online Contents | 1997