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Buoyancy factor
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HWDP Weight & Buoyancy Calculator
A collar’s weight in air is not the weight-on-bit you get. See the buoyancy-corrected figure.
Effective wt (lb/ft)
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Air wt / joint (lb)
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Buoyed wt / joint (lb)
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Buoyancy factor = 1 − (mud weight ÷ 65.4), using a steel density of ~65.4 lb/gal. Effective weight is the usable contribution in mud. Figures are nominal for planning; verify against your mud program and exact joint weights.
