Hydraulic Horsepower (HHP) Calculator

    Calculate hydraulic horsepower from flow rate and pressure drop for bit hydraulics and drilling optimization.

    Calculation Inputs

    gpm

    Circulation flow rate in gallons per minute

    psi

    Pressure drop across nozzles or component

    What Is Hydraulic Horsepower at the Bit?

    Hydraulic horsepower at the bit quantifies the power delivered by the drilling fluid across the bit nozzles. It is used for optimizing bit hydraulics and hole cleaning.

    Hydraulic Horsepower Formula

    In drilling hydraulics, the same basic relationship applies:

    HHP = (ΔP_psi × Q_gpm) / 1714

    Where:

    • ΔP_psi = pressure drop across the bit (psi)
    • Q_gpm = flow rate through the bit (gpm)

    Example Hydraulic Horsepower at Bit

    Suppose:

    • Pressure drop across bit = 1,200 psi
    • Flow rate = 600 gpm
    HHP = (1,200 × 600) / 1714 ≈ 420 hp

    Hydraulic Horsepower and Hole Cleaning

    Increasing hydraulic horsepower at the bit generally:

    • Improves jet impact on the bottom of the hole.
    • Enhances cuttings removal from beneath the bit.
    • Must be balanced against pump pressure limits and ECD constraints.

    Hydraulic Horsepower FAQ

    Is higher hydraulic horsepower always better?

    Not always. There are diminishing returns beyond a certain point, and higher HHP requires higher pressure, which can increase ECD and equipment loading. Optimization involves balancing rate of penetration, hole cleaning, and pressure limitations.

    Basic Formula:

    HHP = (ΔP × Q) / 1714

    Industry-standard formula for hydraulic horsepower

    HHP: Hydraulic Horsepower
    ΔP: Pressure Drop (psi)
    Q: Flow Rate (gpm)
    1714: Conversion constant for field units

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