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Title: The Influence Of Fluid Properties On Allocation Accuracy
Author: Jim Mcnaught, Norman Glen, Andy Johns, Carrie-Anne Irvine
Source: 2008 South East Asia Flow Measurement Conference
Year Published: 2008
Abstract: In the North Sea and elsewhere, many oil companies make use of shared pipeline systems to transport oil from the wells to shore. Each operator measures the volumetric flow rate of oil from their well to the shared pipeline. To enable correct allocation of oil to each operator once it reaches the refinery, it is necessary to know the effects of temperature and pressure on the volume of oil, i.e. the variation of density as a function of temperature and pressure. Current practice is based on measuring the density of the oil at process conditions, using a densitometer, and then using generic crude oil expansion coefficients to correct fluid densities to other conditions. However, there are concerns about the calibration procedures for densitometers and the applicability of current crude oil volume correction procedures. TUV NEL is currently running a Joint Industry Project aimed at addressing issues associated with the characterisation and traceable calibration of densitometers used in the North Sea oil industry. However, even with perfect densitometer operation, errors will be introduced by the use of inappropriate coefficients to correct the density at densitometer conditions to that at base conditions and then to that at meter conditions, as expansion coefficients for North Sea crude oils have never been adequately defined. The validity of using generic expansion coefficients on crude oils containing substantial amounts of water or natural gas liquids is highly questionable since the tables and procedures were developed for dry, stock tank crude oils.

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