A Set of Graphical Design criteria for Slotted Liners in SteamAssisted Gravity Drainage Production Wells

  • Author(s) / Creator(s)
  • Slotted liners have been widely used in steam-assisted gravity drainage (SAGD) wells owing to
    their low cost and superior mechanical integrity. Multiple factors affect the performance of slotted
    liners, such as particle size distribution (PSD) of formation sands, aperture size, slot density, fluid
    flow rate, and wellbore operational conditions. Currently, most of the existing design criteria
    formulate the lower and upper bounds of aperture based on one or several points on the particle
    size distribution curve of oil sands. Most of these design criteria neglect the slot density, wellbore
    operational conditions, and shape of the PSD curve.
    This study carries out a series of large-scale pre-pack sand retention tests (SRT) step rates. The
    aim is to investigate the impacts of aperture size, slot density, and fluid flow rate on the slotted
    liner performance. Comprehensive design criteria for determining the safe aperture window are
    presented to maintain the sanding and the wellbore plugging of the zone near the slotted liners
    within an acceptable level. Sand production governs the upper bound of the aperture size, and flow
    performance guides the lower bound of the aperture size. The new criteria are presented
    graphically to illustrate the optimal slot window as a function of the sand PSD, slot density, and
    fluid flow rate. The results of separate tests are used to demonstrate the performance of the new
    design criteria. The optimal slot window obtained via the new design criteria guides the slot liner
    selection in the SAGD process.

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  • Type of Item
    Article (Draft / Submitted)
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    Attribution-NonCommercial 4.0 International