Due to the inconvenient maintenance and high costs of subsea flowmeters, virtual subsea flow metering technology is developed for subsea gas condensate fields, especially for marginal fields. In this paper, virtual subsea flow metering technology is introduced, the advantages are summarized, and international virtual metering products are listed. For a typical gas field virtual subsea flow metering system, the configuration, input and output data, as well as flow models and calculation methodology is explained. A virtual flow metering field application case in a subsea tieback gas condensate field in offshore China is introduced, from the project background to the application execution and finally the results. The virtual metering results met well with gas field data and showed great robustness by continuously working on the site.

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