Formulas and Calculations for Drilling, Production, and Work-over

Table of Content

  1. Basic Formulas
    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
  2. Basic Calculations
    1. Volumes and Strokes
    2. Slug Calculations
    3. Accumulator Capacity — Usable Volume Per Bottle
    4. Bulk Density of Cuttings (Using Mud Balance)
    5. Drill String Design (Limitations)
    6. Ton-Mile (TM) Calculations
    7. Cementing Calculations
    8. Weighted Cement Calculations
    9. Calculations for the Number of Sacks of Cement Required
    10. Calculations for the Number of Feet to Be Cemented
    11. Setting a Balanced Cement Plug
    12. Differential Hydrostatic Pressure Between Cement in the Annulus and Mud Inside the Casing
    13. Hydraulicing Casing
    14. Depth of a Washout
    15. Lost Returns — Loss of Overbalance
    16. Stuck Pipe Calculations
    17. Calculations Required for Spotting Pills
    18. Pressure Required to Break Circulation
  3. Drilling Fluids
    1. Increase Mud Weight
    2. Dilution
    3. Mixing Fluids of Different Densities
    4. Oil Based Mud Calculations
    5. Solids Analysis
    6. Solids Fractions
    7. Dilution of Mud System
    8. Displacement - Barrels of Water/Slurry Required
    9. Evaluation of Hydrocyclone
    10. Evaluation of Centrifuge
  4. Pressure Control
    1. Kill Sheets & Related Calculations