Unparalleled Measurement Accuracy

The outstanding performance of the MPM High Performance Meter has been proven in operator-driven qualification program.s Assuming the MPM Meter is used for fiscal allocation measurements, then the measurement uncertainty of all wells combined would be of interest. On such a (cumulative) basis, the measurement accuracies for oil and gas obtained during a series of blind-tests are approaching the accuracy levels for single phase metering.

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MEASUREMENT UNCERTAINTY SPECIFICATIONS.

There is unfortunately no uniform way to express measurement uncertainty for a muliphase or wetgas meter. This implies that meter vendors apply different basis for their specifications.

MPM has selected to base our specifications on real-field test data. Our specifications could have been quite a lot "better", if we'd based them on analytical calculations or testing at ideal lab conditions (see figure).  But since our meters are to be used in the real-life, and not in a lab, we prefer quoting specifications which have a true physical value. The MPM meter specifications are thus based on a conservative calculation reflecting:

  • site specific installation effects
  • reasonable uncertainties in the configuration parameters (PVT data)
  • natural variations in fluid properties
  • real-life variations in the flow regime (including slug flow)
It should be noted that the MPM meter is NOT dependent on individual field calibrations prior to testing. Further, due to the digital measurement principle the meter instrumentation is immune to drift.

Accuracy Specifications

MPM is specifying the measurement uncertainties in the following ways:

i. Cumulative basis
ii. Short period testing

Consistency between the two sets of specs has been demonstrated in the above mentioned field qualification tests as well as in all other tests.

Further details are provided in MPM's White Paper No 1, Unparalleled Measurement Accuracy and Sensitivity, that can be requested from MPM.

Annular gas concentration

The MPM meter performs tomographic measurements to determine if, and to what extent annular gas concentration is present in the flow. The meter automatically corrects the measurement for this effect, that otherwise could have led to large and unknown errors.

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