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Title: Assessment Of Allocation Systems: Combining Data Validation & Reconciliation Scheme And Pvt Simulations
Author: Dennis Van Putten, Lennart Van Luijk , Izwan S A Wahab, Siti F B Johari
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: Allocation methods are applied in the oil and gas industry to compensate for the imbalance in measurement systems. Reconciliation of the measured values is possible if redundancy in the measurements is present. Different approaches to resolve this imbalance are designed 1and the choice of the allocation method depends on the agreement between the stakeholders. The need for more fair allocation methodologies is increasing nowadays due to the fact that accurate metering at every relevant element of a production facility is either very expensive or physically (near to) impossible, taking into account recent trends such as deep-water field development, use of subsea production systems, enhanced oil recovery and tie-backs of pipelines from satellite fields. This leads to the sharing of production or transport facilities and meters for different wells, which in turn leads to more complex allocation systems 5. The industry is driving towards more efficient operation which leads to more small field tie-ins in existing allocation systems. The same cost efficiency may lead to the choice of the operator to omit metering or use alternatives like virtual flow metering 4. Also, more small-size operating companies are buying (depleting) fields from larger operating companies, leading to more stakeholders in an allocation system. Change in the allocation procedure, the number of stakeholders or the operating conditions in an allocation system, requires an assessment on the procedures in place to critically evaluate the impact on the stakeholders such as Finance, Operations, Facilities Engineers and Reservoir Engineers. For increasingly complex production systems, the traditional allocation processes appear to be less suitable and an alternative methodology is required.

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