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Title: Specification Of Wet Gas Measurement Equipment For Fiscal Allocation
Author: Max Rowe, Rod Bisset, Anthony Alexander
Source: 2005 North Sea Flow Measurement Workshop
Year Published: 2005
Abstract: In the UK North Sea new developments are increasingly utilising existing infrastructure for processing and transportation of hydrocarbons. Utilising existing infrastructure for such developments brings challenges as to how to cost-effectively allocate the produced hydrocarbons (as well as water, fuel usage, and emissions) back to each field - particularly where these fields are under different ownership. When a new field is to be accepted by a host, it is necessary to define a functional specification for the measurement equipment. This is usually documented as part of the allocation agreement. The question that needs to be addressed is: What is an acceptable measurement specification?. The ultimate answer will be one which meets standards set by relevant Government authorities and is acceptable to all parties who approve the allocation agreement. One approach, often used, is to apply standard guidelines derived from industry best practice, e.g. 1% uncertainty for a gas fiscal flow measurement. This approach has the advantage of being simple to apply, but may involve some measurements being made with an unnecessary degree of accuracy. Another approach is to undertake modelling of uncertainty in the measurement system to establish the criticality of each measurement (See for example 1). Scheers and Wolff (2) point out the need to consider the whole measurement system through to allocated revenue and propose that the optimum uncertainty of each measurement should be established by evaluating the trade-off between measurement costs and the losses and risks of uncertainty in the measurement. In this paper an extension of these approaches is applied to the Britannia facilities in which uncertainty modelling was applied to the propagation of uncertainty through the whole measurement and allocation system and was used to establish the impact on each company or fields revenue stream.

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