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Principle of Operation

The Haimo MPFM is a combination of a gas/liquid two-phase (in-line) flow meter and a full-range three-phase water cut meter. The gas/liquid flow rate measurement and water cut determination are carried out independent of each other.ents.

The gas/liquid two phase flow meter consists of a Venturi and two identical single (59.5 KeV) gamma sensors. The full range three-phase water cut meter comprises a dual energy (22 and 59.5 KeV) gamma sensor and a flow conditioner located upstream.

Both the gas and liquid flow rates are measured upstream of the flow conditioner in the two-phase flow meter, which is in-line without needs of any flow conditioning or separation. The Dual gamma meter measures the water cut.

Net oil flow rate is finally calculated based on the gross liquid and watercut.

  

 
 

Design Philosophy

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Engineer Custom solutions & remain cost effective.
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Emphasis on net oil flow rate measurement; net oil measured independently measured in the dual gamma meter under stable flow regime.
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Balance among accuracy, repeatability and operating envelope.
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Non intrusive techniques to make the system robust without needs to do daily maintenance.
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Simple construction to lessen cost and pressure drop.

Highlights

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Compact, robust and remote control design.
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Recalibration not necessary unless fluid properties remarkably vary.
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Low energy gamma source...effective discrimination between the phases; predominance of photo-electron effect over Compton effect.
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More than a substitute for a test separator.
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Excellent cost performance.
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Nearly 200 meters commercially installed in onshore and offshore applications.

Performance Advantage

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Wide operating range with watercut 0-100% and GVF 0-99.8%.
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Consistent accuracy of ±1.5% abs. in watercut measurement over 0-27% GVF and ±2% abs over 0-99.8% GVF range, independent of watercut range.
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Practically no upper limit on liquid flow rate and corresponding GVF’s upto 99.8%.
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Meter turn downs as high as 1:50.
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Accept all flow regimes.
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No use of flow models; multiphase flow metering measurements and calculation based on fundamental laws of physics.
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Non intrusive and inline measurement proven in labs and fields.

 
 
 

Design Philosophy
Highlights
Performance advantage
Typical Uncertainties
Gamma absorption principle

  
  Typical Uncertainties
Gross liquid: +/- 5% relative of reading, GVF <60%
+/- 10% relative of reading, 60% <GVF <99%
Confidence Level : 90%
Gas :  +/- 10% relative of reading
Confidence Level : 90%
Watercut : +/- 2% absolute of full range
Confidence Level : 90%

The Untold secret about net oil measurement

Net oil flow rate accuracy depends on watercut. All multiphase meters calculate the net oil flow rate from the measured watercut and the gross liquid rates. The higher the watercut and worse the abs. accuracy of the watercut, the poorer is the net oil flow rate in accuracy.

By measuring within a consistent band of ± 2% watercut abs. for 0-100% watercut and 0-99.8% GVF, Haimo meters by and large provide the most accurate solution for the full range of watercut and GVF.

ISO 14001 ISO 9001:2000


 Further links

 Download - Haimo MFM data sheet
Download - GVF from GLR
Download - Gas in sm3d from GVF
Download - GVF from scfd Gas
Download - Automatic Well Data Plot