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Multiphase Desander – Application and Mechanical Requirements (B-FSM095)

The following guidelines provide the application and mechanical requirements for the multiphase desander.

Application and Operations

Installation Location

  • Pre choke (API)
  • Post choke (ASME)
  • Subsea – in development

Applications

  • Well testing, well cleanout, underbalanced drilling, produced solids, proppant flow back

Utilities

  • Flush/fill accumulator (clean water any source at 50 psi)

Consumables

  • Insert replacement and o-rings

Process Connections

  • Five standard: inlet, clean fluid outlet, solids discharge, accumulator-vent, and accumulator-flush/fill

Mechanical Requirements

Footprint

  • Generally, 1 m² bare equipment and 1.5-2.0 m² for skid with basic valves/piping/instruments

Height

  • 3-5 meters pending accumulator size

Orientation

  • Vertical standard, but WHD vessel can be operated horizontal

Weight

  • 2,000-4,000 kg bare equipment, 10,000-25,000 kg full skid

Pressure Rating

  • ANSI: 150#-2500#
  • API: 5K, 10K, 15K

Materials of Construction

  • Vessel: 4130 CS standard, Available: F22, UNS31803, UNS32760
  • Insert: Standard is UNS 31803 w/ HVOF-WC internal, alternate is thick RB-SiC with duplex sheath

Operation

  • Instrumentation: Inlet-Overflow DPI, Inlet PI
  • Valves: Accumulator isolation, discharge, vent, and fill
  • Normally operated manual (valves) but can be automated

Multiphase desander application and mechanical requirements will be covered in the next article.

References

  1. Rawlins, C.H. 2017. “Separating Solids First – Design and Operation of the Multiphase Desander”, paper 185658-MS presented at the SPE Western Regional Meeting, Bakersfield, CA, 23-27 April.
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