Cement Sack & Slurry Yield Calculator

    Calculate the number of cement sacks, total slurry volume, and mixing water required for primary cementing, plug jobs, or squeeze operations.

    Calculation Inputs

    Volume of cement slurry needed

    Volume of mixed slurry per 94 lb sack

    gal/sk

    Gallons of water required per sack

    Percentage over gauge volume for washouts

    What Does the Cement Calculator Do?

    The cement calculator estimates the slurry volume and number of sacks required for primary and plug cementing jobs. It uses annular capacity, interval length, planned excess, and slurry yield to determine the amount of cement needed.

    Key Relationships and Units

    A commonly used conversion is:

    1 bbl = 5.615 ft³

    Slurry yield is usually given in ft³ per sack (ft³/sk) or bbl per sack (bbl/sk).

    Basic Cement Volume Formula

    For a given annular segment:

    Ann_vol_ft3 = Ann_cap_ft3_per_ft × Length_ft

    Adj_vol_ft3 = Ann_vol_ft3 × (1 + Excess_frac)

    Sacks = Adj_vol_ft3 / Yield_ft3_per_sk

    Example Cement Volume Calculation

    Suppose:

    • Annular capacity = 0.0559 bbl/ft
    • Interval length = 1,000 ft
    • Excess = 20% (0.20)
    • Slurry yield = 1.18 ft³/sk
    Ann_cap_ft3_per_ft = 0.0559 × 5.615 ≈ 0.314 ft³/ftAnn_vol_ft3 = 0.314 × 1,000 ≈ 314 ft³Adj_vol_ft3 = 314 × 1.20 ≈ 377 ft³Sacks = 377 / 1.18 ≈ 319 sk

    Cement Calculator FAQ

    Why is excess cement planned?

    Excess accounts for hole irregularities, washouts, and measurement uncertainties. It improves the chance of full coverage over the interval of interest.

    Does slurry yield change with mix water and additives?

    Yes. Slurry yield depends on the cement blend, water ratio, and additives. The calculator uses the yield value provided by the user, which should come from lab testing or program data.

    Basic Formula:

    N = V × (1 + E) / Y

    Where N = sacks required (rounded up to whole sacks)

    N: Number of cement sacks (rounded up)
    V: Required slurry volume
    E: Excess factor (0.10 = 10%, etc.)
    Y: Slurry yield per sack (ft³/sk or bbl/sk)

    Mix Water Formula:

    W = N × gal/sk

    Total water = sacks × water per sack

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