// multi-utility computation suite · offline · instant · precise
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eng.drilling-mud-weight Calculator
Calculates drilling mud weight (density) needed to control formation pressure and prevent wellbore instability, in ppg and psi/ft. Mud weight must exceed formation pore pressure gradient to prevent blowout but not exceed fracture gradient — the drilling window can be narrow in depleted reservoirs.
Inputs
Depth Ft
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Pore Pressure Psi
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Fracture Gradient Psi Ft
Reference formula or conversion factor shown for context.
Results
required mud weight (ppg)
The computed weight (gravitational force) or mass.
max mud weight (fracture)
The computed weight (gravitational force) or mass.
drilling window (ppg)
Sample size or count used in the calculation.
0.052 psi/ft per ppg
Reference formula or conversion factor shown for context.