Drill String - Hook Load

Drillstring hook-load calculation - weight of drill pipe + collars × buoyancy factor.

Drill stringHook loadDrilling

DP lengthmDP weightkg/mDrill collar lengthmCollar weightkg/mMud densitykg/m³

Hook load: 1,024kN

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

HL = W_{string} \cdot (1 - \rho_m/\rho_{steel})

Symbol	Meaning	Unit
$W$	String weight in air	kN
$ρ_m$	Mud density	kg/m³

Source: API Spec 7-1 / IADC

In short

Drillstring hook-load calculation - weight of drill pipe + collars \u00d7 buoyancy factor.

Learn the theory Offshore Drilling and Wells: The MODU Perspective