The results of the multiphase model presented in the previous post are shown in the header graphic and detailed as follows.

Baseline Pressure Drop (<70% fill)

• Screen % opening does not control pressure drop
• Pressure drop from combined friction flow losses in other sub-regions
• Solids fall into cylinder bottom and level fill upward

Transition region (to 2X baseline ΔP)

• Solid level starting to block screen area
• % open area reducing and screen pressure loss taking over
  

Blocking region (>2X baseline ΔP)

• Rapid pressure drop increase due to screen blockage – screen pressure loss controlling factor
• Recommend shut down and solids purge at 2X baseline
  

Design Factors

• Limit superficial velocity through apertures to minimize erosion – recommended limit with 316SS screens is 1 ft/s (0.33 m/s)
• Limit pressure drop to prevent cylinder screen burst
• Limit operation time based on fill rate – 50 liter total volume in screen

References:

1. Rawlins, C.H., “Sand Management Methodologies for Sustained Facilities Operations”, Oil & Gas Facilities, Vol. 2, No. 5, October 2013, pp. 27-34. https://doi.org/10.2118/1013-0027-OGF

Next week I will cover WSF operating envelope.