Tracking well performance is essential in understanding reservoir behaviour, reservoir management and matching reservoir simulation models with historical data. It results in forecasting reservoir performance accurately. Also, tracking wells performance for multi-fields company with multi joint ventures is important for production allocation for fair company revenue distribution. Regular well testing is required for tracking well performance but in a subsea environment using traditional testing tools such as test separators and slick line downhole gauges to measure production rates and bottom hole pressures, would cost millions of dollars. So these types of tools don't suit a subsea environment therefor other tools to track subsea wells performance are required.

This paper presents tools to tracking subsea wells performance without test separator and by using interventionless tools such as; permanent down hole gauges, venturi and wet gas meter (WGM) with identifying uncertainty in rates measurements with these tools and focusing on measured rate validity techniques by using quality checking (QC) tools such as: a) tracking field production allocation factor b) Sensitivity on measured rates by Integrated asset model (IAM), c) using shifted well inflow performance relationship (IPR) and d)Comparing pressure drops along flow paths with initialized selected well flow correlations.

Successful applying of QC techniques on monitored rate of subsea wells for gas field Z allows for identifications of errors in rates measurements and predicting the actual well rate. These assist in simulation history matching and fair distribution to company revenues between JV partners companies.

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