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D Exponent Calculator

D Exponent Calculator is used to find the d-exponent value which is the assumption of drilling parameters to get pressure while drilling into over pressured zones.

Related Calculators


D Exponent Calculation

Penetration Rate (R) = Ft / Hr
Rotary Speed (N) = Rev / Minute
Weight on Bit (W) = 1000 Lb
Drill Bit Diameter (D) = Inches
Mud Weight Equivalent (Pn) = Lb / Gal
Mud Weight Used (Pm) = Lb / Gal
Shale Compactibility Coefficient (C) =


d-Exponent value =

 
   
  
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Formula

      d = [ (log ( R / (60 × N) ) / log ( (12 × W) / (1000 × D) ) ] × ( Pn / Pm )c

Where,
    d = d-exponent value
    R = Penetration Rate
    N = Rotary Speed
    W = Weight on Bit
    D = Drill Bit Diameter
    Pn = Mud Weight Equivalent
    Pm = Mud Weight Used
    C = Shale Compactibility Coefficient

Use this simple online D Exponent calculator to detect transition from normal pressure to abnormal pressure.