Norsk Hydro AS has employed multilateral well completions in the Troll Olje field to increase the total wellbore drainage area from the existing subsea template structures, rather than add additional templates. The company expects the multilateral well program to total 28 wells by 2003 and contribute 88 million bbl of additional oil reserves. This compares with the more expensive alternative of adding four wellhead templates or 16 single-lateral well slots, which the company predicts would drain only 50 million bbl. The Troll Olje field lies in 100 km northwest of Bergen in the Norwegean sector of the North Sea in 312 to 340 m water depth. Within the Troll gas field, Norsk Hydro must develop two areas that have a thin oil rim: a 22 to 26 m thick oil zone in the Troll Olje oil province and a 13 m thick oil zone in the Troll Olje gas province. From these two area combined, the company expects to recover 1.35 billion bbl of oil. The Troll field wells produce to one of two floating production platforms, the Troll B and Troll C, and by January 2001 the company has produced a total of 585 million bbl of oil from the field. Norsk Hydro has drilled and completed 80 wells, which included 13 dual-branched multilateral wells. Continued development of Troll Olje will require 15 additional multilateral wells, which will include two three-branched multilateral completions.


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    Title :

    Multilateral wells increase reserves, lower costs on Troll Olje field


    Additional title:

    Im Toll-Olje-Ölfeld in dem norwegischen Teil der Nordsee konnten durch multlaterale Bohrungen Kosten eingespart und Reserven gesteigert werden


    Contributors:
    Gronas, T. (author) / Hundsnes, L. (author)

    Published in:

    Oil and Gas Journal ; 100 , 23 ; 51-58


    Publication date :

    2002


    Size :

    6 Seiten, 5 Bilder, 7 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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