Common Formulas

Common Formulas

OPEN HOLE CAPACITY (m³/100m)

Hole Diameter (mm)²

12732

ANNULAR VOLUME (m³/100m)

= Hole Diameter (mm)² - Pipe Diameter (mm)²

  12732

RECTANGULAR TANK VOLUME (m³)

= Length (m) X Width (m) X Height (m)

CYLINDRICAL TANK VOLUME (m³)

= Tank Diameter (m)² X Height (m)

   1.2733

HYDROSTATIC PRESSURE (kPa)

= Mud Density (kg/m³) X Depth (m) X 0.00981

FORMATION PRESSURE (kPa)

= SIDPP (kPa) + Hydrostatic Pressure (kPa)

BARITE (kg) REQUIRED TO RAISE DENSITY 1 TO DENSITY 2

= 4200 X (D₂ – D₁) X Mud Volume (m³)

    4200 – D₂

VOLUME (m³) OF WATER REQUIRED TO REDUCE DENSITY 1 TO DENSITY 2

= (D₁ – D₂) X Mud Volume (m³)

    D₂ – 1000

VOLUME (m³) INCREASE DUE TO WEIGHTING MATERIAL

= Amount of Weighting Material Added (kg)

   Weighting Material Density (kg/m³)

TOTAL CIRCULATING TIME (min)

= Total Circulating Volume (m³)    

   Pump Output (m³/min)

BOTTOMS UP TIME (min)

= Total Annular Volume (m³)

    Pump Output (m³/min)

ANNULAR VELOCITY (m/min)

= Pump Output (m³/min) X 1273 x 10³

    Hole Diameter (mm)² – Pipe Diameter (mm)²