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Title: Three Years Of Experience Of Wet Gas Allocation On Canyon Express
Author: Aditya Singh, James Hall, Winsor Letton
Source: 2005 North Sea Flow Measurement Workshop
Year Published: 2005
Abstract: In September 2002, production was begun from the three fields that together form the Canyon Express System- Kings Peak, Aconcagua, and Camden Hills. The 9 wells from these fields are connected to a pair of 12-inch flow lines carrying the commingled wet gas a distance of approximately 92 kilometers back to the Canyon Station platform for processing. At the 21st NSFMW in October 2003, an initial report was given on the status of Wet Gas Allocation for the Canyon Express project 1. As discussed in that paper, dualdifferential, subsea wet gas meters were chosen for the task of allocating gas and liquids back to individual wells. However, since the gas from all three fields was very dry (Lockhart-Martinelli parameter 0.01) and because the operating pressures were quite high (250 bar), application of the dual-differential function of the meters yielded errors in both liquid and gas flow rates. Furthermore, as these problems were being uncovered, scale was beginning to collect inside some of the meters. Taken together, these problems produced system imbalances as great as 20%. To address the problems, one of the individual flow metering elements within each wet gas meter was chosen as the allocation meter, operating as a single-phase gas meter. Using a multi-point flow testing methodology, the response of the individual meters was characterized, with the result that a much improved system flowline balance has been maintained since its application. This methodology was approved by the U.S. Mineral Management Service for the Canyon Express field development.

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