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.


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    Titel :

    Materials selection testing for the Asgard field well tubulars


    Weitere Titelangaben:

    Prüfungen zur Werkstoffauswahl für die Bohrrohre des Asgard-Feldes


    Beteiligte:
    Nice, P. (Autor:in) / Kopliku, A. (Autor:in) / Scoppio, L. (Autor:in)

    Erschienen in:

    Stainless Steel World ; 9 , 6 ; 33-38


    Erscheinungsdatum :

    1997


    Format / Umfang :

    6 Seiten, 6 Tabellen, 6 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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