Case One

Heavy Oil MPFM Allocation, Alaska

Requirement 

Estimate the oil phase measurement uncertainty for a MPFM (Multi-Phase Flow Meter) on the liquid leg of a slug catcher with high viscosity, tight emulsion and entrained gas. 

Solution 

A model of the MPFM phase detector and flow element was developed for 0-50% GVF and 0-50% WLR with liquid viscosities 50-3,000 cP, using a Re (Reynolds number) Cd (Coefficient of Discharge) correction. The phase detection uncertainty was found with MCS and the flow element using RSS (Root Sum Square) methods. The model was run for three flow element sizes each with 24 cases to provide an uncertainty matrix for the allocation tariff adjustment.