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Title: Challenges And Opportunities For Subsea Multiphase Meters In The Brazilian Pre-Salt
Author: Luiz Octavio, Richard Streeton
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: The Brazilian pre-salt discoveries are among the most important made in the world over the last decade. This province comprises large accumulations of high commercial value light oil-a reality that puts Brazil in a strategic position to meet the ever increasing global demand for energy. Based on conservative estimates, and only considering the portion already discovered, the pre-alt could double the countrys oil reserves to 31 billion barrels. Multiphase flow meters (MPFM) have been in development since the 1980s. However, it was not until recentlythat the technology has matured sufficiently to be used in subsea allocation applications. For operators, the use of subsea multiphase meters may bring important cost savings in CAPEX via the simplification of subsea field layouts as well as in OPEX as they provide continuous real-time reservoir and production monitoring capabilities. In Brazil, the National Agency of Petroleum, Natural Gas and Biofuels (ANP) adopted resolution No.44/20151 in October 2015 covering the use of multiphase meters for production allocation. In recent ANP auctions, interest in the pre-salt has been high among International Oil Companies (IOCs). With a continued relatively low oil price, a premium must be placed on technologies that can reduce CAPEX and OPEX on the cost side and/or contribute to improved reservoir and production management on the revenue side. Multiphase metering is a technology that is able do both and can thereby have a significant impact on the overall viability of pre-saltfield developments.The paper outlines how the deployment of multiphase meters can facilitate a wider range of possible subsea layouts-potentially more cost effective that a single-riser philosophy. This is important in Brazil as most fields-and particularly the pre-salt, lie in ultra-deep water. The paper summarizes the significant points of the ANP resolution that impact subsea field layouts. Finally and most importantly, the specific measurement challenges for multiphase metering in the pre-salt will be outlined.

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