(Continued from issue 102(2004)41, pp 37-42) This is the concluding part of a five part series about decommissioning of platforms in the Gulf of Mexico. An analysis showed that severing platforms with explosives is a time-invariant and structure-dependent operation that provides contractors the advantage of knowing the costs before executing the job. In this article cost statistics and procedures for severing platforms with explosives are presented. The analysis compiled a database from 139 jobs in the Gulf of Mexico conducted between 1999 to 2002. The sample set included 730 piles with a total of 25,200 ft of cut length and 605 conductors with a total of 32,062 ft of cut length. Tables show the diameter range of element cut with explosives and the frequency application of explosives as a function of water depth. It can be seen that most piles (83 %) and conductors (95 %) cut had a 42 inch or smaller OD (outer diameter). Most jobs with explosives include only one site (80 %). The drop-off in the frequency of explosive severance with increasing water depths reflects the nature of the structures removed. The equations necessary for the analysis are presented and explained. Two examples demonstrate the calculation procedure. It is shown that the cost to cut pilling on a pile-only job is 6,925 USD/pile, while the cost to cut a conductor on a conductor-only job is 2,754 USD/conductor. On a length cut, the cutting cost is 604 USD/ft for a pile versus 177 USD/ft for a conductor. The conductor cut has a lower cost because conductors typically contain several inner casing strings that when measured, add to the conductor cut lenght but do not require a greater explosive chart. Explosive-severance contracts typically charge on a per-element basis without regard to the number of the inner casing strings. A conductor-only explosive cut was the least expensive of all cutting operations on a total cost-per-day basis, while pile-conductor jobs had the lowest cost per cut. Water depth has a weak positive correlation with the average cost to perform explosive severance. Large piles in deep water that require 1-inch diameter or greater cable can significantly affect total cost. But because the database includes mostly jobs within a 300-ft water depth, the analysis may not detect the influence of water depth on average cost.


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    Titel :

    Model estimates explosive costs. Gulf of Mexico decommissioning-Conclusion


    Weitere Titelangaben:

    Ein Modell zur Ermittlung der Explosivkosten. Die Stilllegung von Plattformen im Golf von Mexiko. Teil 5-Schlussteil


    Beteiligte:

    Erschienen in:

    Oil and Gas Journal ; 102 , 43 ; 50-53


    Erscheinungsdatum :

    2004


    Format / Umfang :

    4 Seiten, 8 Tabellen, 1 Quelle



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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