Drillstring hook-load calculation - weight of drill pipe + collars × buoyancy factor.
Formula
$$ HL = W_{string} \cdot (1 - \rho_m/\rho_{steel}) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $W$ | String weight in air | kN | drill pipe data |
| $ρ_m$ | Mud density | kg/m³ | mud engineer |
Sources
- API Spec 7-1 / IADC.