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Wellhead Screen-Filter – Performance Curve and Design Factors (B-FSM-106)

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.

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