Well volumes & circulation time
Annular and string volumes section by section, then the strokes and the minutes to bottoms-up and to a full circulation.
Drilling
Kill sheet — driller's method
Kill mud weight, initial and final circulating pressure and the step-down schedule, for rehearsal and for checking a sheet that has already been worked.
This is a rehearsal and review aid, not an operational document. The controlled sheet on site is the one that counts.
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How it is calculated
- Kill mud weight = current MW + SIDPP/(0.052 × TVD).
- Initial circulating pressure = slow circulating rate pressure + SIDPP. Final = SCR × KMW/MW.
- The step-down schedule interpolates drill-pipe pressure linearly against strokes while kill mud fills the string.
- Influx gradient = mud gradient − (SICP − SIDPP)/influx height, with influx height from pit gain and annular capacity. Below 0.15 psi/ft the influx is read as gas.
Standards it speaks
Where this stops being true
This is a rehearsal and review aid. It is not a well-control document and must not be used to kill a well. It assumes a vertical single-bubble influx, one uniform annulus, a constant pump efficiency and no migration while the sheet is being worked — none of which hold on a live well. The controlled kill sheet on the rig, filled in and signed by the people on tour, is the only sheet that counts.
Related tools
ECD & bottom-hole circulating pressure
Annular pressure loss, flow regime and the equivalent circulating density the formation actually sees while the pumps are running.
Bit hydraulics & nozzle selection
Total flow area, nozzle pressure drop, HSI and jet impact force — plus the nozzle size that would put the optimum share of pump pressure at the bit.
Directional survey — minimum curvature
Paste MD, inclination and azimuth and get TVD, northings, eastings, dogleg severity, vertical section and closure — with the well path drawn.