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Abstract Development costs have risen drastically as producers have ventured into deepwater operations. This increase in investment level has created a case to tieback subsea wells to hub facilities. The various tiebacks which introduce commingled production with different ownership and royalty rates have significantly increased the complexity of the allocation process, i.e. determining individual well production, portion of sales, etc. Thus, a great deal of effort is spent on determining the best approach and most accurate means of analyzing and allocating the production. On an ongoing basis, the management of the allocations can be a significant effort and many companies have developed custom processes. On top of the allocation complexities, companies are now faced with Sarbanes-Oxley compliance requirements. BP faced these issues in the management of their complex allocation processes in the Gulf of Mexico (GoM). This presentation discusses the process and trials faced in developing a solution that meets all audit and operational requirements. The final solution, rolled out last year, involved the change of business processes within BP, the development of a new application by P2 Energy Solutions and some BP specific processes developed by several third parties. The benefits thus far have been substantial and include the ability to process each facility in a timely, accurate, auditable and reliable manner.