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Cuttings Transport Ratio

Fraction of annular velocity effectively lifting cuttings out of the hole.

Formula

CTR = 1 - \frac{V_{slip}}{V_a}

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Variables

CTRTransport ratio

V_{slip}Cutting slip velocity

V_aAnnular velocity

Example

V_slip=50, V_a=220 ft/min: CTR = 0.77

Did You Know?

Poor cuttings transport lets a bed of debris settle, which can stick the drill pipe fast.

petroleum cuttings transport

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