1. Basic Formulas

Table of Content

  1. Pressure Gradient
  2. Hydrostatic Pressure
  3. Converting Pressure into Mud Weight
  4. Specific Gravity
  5. Equivalent Circulation Density
  6. Maximum Allowable Mud Weight
  7. Pump Output
  8. Annular Velocity
  9. Capacity Formulas
  10. Control Drilling
  11. Buoyancy Factor
  12. Hydrostatic Pressure Decrease POOH
  13. Loss of Overbalance Due to Falling Mud Level
  14. Formation Temperature
  15. Hydraulic Horsepower
  16. Drill Pipe, Drill Collar Calculation
  17. Pump Pressure, Pump Strokes
  18. Cost Per Foot
  19. Temperature Conversion Formulas

1.3 Converting Pressure into Mud Weight

Convert pressure, psi, into mud weight, ppg using feet as the unit of measure

mud weight, ppg = pressure, psi ÷ 0.052 ÷ TVD, ft

Example: pressure = 2,600 psi, and, true vertical depth = 5,000 ft
mud weight, ppg = 2,600 psi ÷ 0.052 ÷ 5,000 ft
mud weight = 10.0 ppg

Convert pressure, psi, into mud weight, ppg using meters as the unit of measure

mud weight, ppg = pressure, psi ÷ 0.052 ÷ TVD, m ÷ 3.281

Example: pressure = 3,583 psi, and, true vertical depth = 2,000 meters
mud weight, ppg = 3,583 psi ÷ 0.052 ÷ 2,000 m ÷ 3.281
mud weight = 10.5 ppg

⬆ Table of Content