Roxar subsea Wetgas Meter

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Emerson Process Management has launched its next-generation Roxar subsea Wetgas Meter for accurate production measurement, reduced risk and improved flow assurance in gas and gas condensate fields. The meter allows the earliest possible detection of water from gas wells.

The unit detects changes in water content of the flowing well at as little as 0.2 ppm - sensitivity that represents less than a droplet of water finely distributed in a volume equal to that of four car fuel tanks. It generates an uncertainty specification of ±0.02% abs WVF (water volume fraction) at GVF (gas void fraction) 99-100%. The meter’s microwave-based measurements are operational in all field conditions and fluid compositions.

The product provides real-time, accurate hydrocarbon measurement for operators’ fiscal allocation obligations. This is due to its multivariate analysis functionality and true three-phase measurement based on a microwave and gamma densitometer. The multivariate analysis functionality also provides PVT (pressure, volume, temperature) independence on water fractions - especially in high GVF flows.

The meter includes an online salinity measurement system that tells the reservoir engineer whether formation water is entering the flow. Combined with highly sensitive and accurate water measurement, this provides a powerful tool for the early detection of formation water breakthrough and the optimisation of injection rates for MEG, scale and corrosion inhibitors.

The meter is suited to the changing operating conditions and varying fluid compositions seen in gas and gas condensate fields. Measurement speeds at 20 times/s enable immediate actions to be taken to protect subsea system integrity and maintain flow assurance.