Kill Sheet Calculator

A kill sheet ties every well-control number together: kill weight, circulating pressures, string and annular volumes, strokes and a step-down schedule so the choke operator knows exactly what drill pipe pressure to hold as kill mud goes down the string.

Formulas

String volumeV = Σ (ID² / 1029.4) × length

Strokes surface to bitSTB = String volume / Pump output

Pressure step-downΔP per step = (ICP − FCP) / number of steps

Worked example

GIVEN

10,000 ft of 5" 19.5# DP (ID 4.276")
Pump output = 0.100 bbl/stk
ICP = 1,120 psi, FCP = 659 psi

WORKING

Capacity = 4.276² / 1029.4 = 0.01776 bbl/ft
String volume = 0.01776 × 10,000 = 177.6 bbl
STB = 177.6 / 0.1 = 1,776 stk
10 steps → drop ≈ 46 psi every 178 strokes

1,776 strokes to bit, DP pressure falls from 1,120 to 659 psi

FAQ

Driller's method or Wait & Weight?

The schedule here is for Wait & Weight (one circulation). For the Driller's method, hold ICP constant on the first circulation, then follow the schedule with kill mud on the second.

Can I print it for the doghouse?

Yes — Pro users can export the kill sheet as a PDF report.

Run it with your well data

Field & Metric units, works offline, save and share results with your crew.

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Reference only. Always verify against your company procedures and well-control certification.