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  5. Model Dualstream Venturi - The Original ...

Model Dualstream Venturi -The Original Wet Gas Metering System

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Dualstream Venturi is a low CAPEX solution for allocation or monitoring of gas flow rate. It is typically used on a per well basis where well testing facilities exist or can easily be deployed. Common applications include tie-ins to existing infrastructure or large multi-well fields where production fluids remain relatively constant throughout field life.

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Generally used in combination with test separators, tracer dilution techniques or Solartron ISA flow meters.

  • Uses existing infrastructure
  • Low CAPEX
  • Uncomplicated & Robust
  • Operator Maintenance
  • Industry Standard Computer
  • Large Installed base


Measurement Application

  • Royalty allocation
  • Flow line monitoring

Measurement Technique
Dualstream Venturi
Wet Gas Correction Algorithm
Liquid fraction from well test

Mechanical Specification
Standard Line Sizes 2” thro 24” Nominal bore
Pressure Class ANSI Class 300# to 2500# (API ratings on request)

Process Temperature Range -40 to 120°C
Meter Body Material Duplex UNS31803 as standard

Alternate pressure ratings (ANSI/API 15K), temperature rating, sizes and material available on request

Installation Requirements
Horizontal installation (vertical on request)

Upstream straight length: 3D to 10D typical (calibrated spool available for allocation systems)

Downstream straight length: None
(5D calibrated spool available with thermowell for allocation systems)

Compact flow meter design options are available for applications where installation envelope is restricted, please contact for details

Operating Range
Turndown: >8:1 typical
Gas Mass Fraction: 50-100%
Water Liquid Ratio: 0-100%

Typical Performance
Uncertainty (95% confidence level):

  • Gas mass flow rate <5%
  • Liquid mass flow rate from well test


Typical Repeatability
Gas Mass Flow Rate 0.15%

Instrumentation
Standard field instrumentation comprising:

  • Differential pressure
  • Gauge pressure
  • Temperature


Data Acquisition
Options available include:

  • Dualstream Flow Computer (safe area)
  • Dualstream PC (safe area)
  • Dualstream PC (hazardous area)


User Required Inputs

  • Hydrocarbon Composition
  • Compositional Data
  • Liquid Density
  • Liquid Fraction (from well test)