CALIBRATION
Validation of test comparisons in well- controlled conditions and with very good
uncertainty of the reference measurements can be achieved by a third-party that is familiar with field well test operations
pressure-volume-temperature (PVT) package to perform the conversion from line to standard conditions, or from the in-use flow meter conditions to reference flow meter conditions.
• If the devices are far from each other, the cumulative volume measured must be three times larger than the storage volume between both flow meters. It is important to remember that the longer the recording, the more accurate the established uncertainty of both devices will be.
• If the devices are far away and the flow reaches the in-use flow meter long before the other device, then the reference flow meter recording time should be defined in order to capture the same type of flow passing through both meters.
• No choking should occur between both devices to keep the PVT package consistent and for the quick evaluation of the line or standard conditions of both devices. • Both devices should be within the sweet spot of their working envelope. • Both devices should be set with the
relevant intrinsic fluid properties package, or equations of state (EOS) to ensure proper calculations.
• The reference flow meter’s transmitters or sensors should be within the specification and zero trimmed or corrected for deviation in order to account for any potential bias. To ensure validity of flow meter measurements, comparison tests can be conducted either during the buying process, before delivery, or sometimes later when results do not match client expectation or reservoir model forecasts. Validation of test comparisons in well-controlled conditions
and with very good uncertainty of the reference measurements can be achieved by a third-party that is familiar with field well test operations. This helps to avoid any conflict about who is right or wrong and provides a clear final statement based on statistical analysis, physics, and field expertise. This work should therefore not be left to the meter manufacturers, as they can be over-optimistic about the performance of their product.
TÜV SÜD
www.tuvsud.com/en-gb/nel
OCTOBER 2021 | PROCESS & CONTROL 9
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