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
Cement slurry & displacement volumes
Slurry volume, sack count, mix water and displacement volume for a primary cement job, from the geometry and the intended top of cement.
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How it is calculated
- Annular volume = (hole area − casing area) × cemented length × (1 + excess).
- Shoe track and rat hole are added; sacks = total slurry / yield; mix water = sacks × water per sack.
- Displacement is the casing internal volume from surface to the float collar, so the shoe track stays cemented.
- Class A, G, H and an extended lead slurry carry typical yields and water requirements; a laboratory blend report overrides them.
Where this stops being true
Volumes only. It says nothing about whether the cement will do its job: mud removal depends on centralisation, standoff, pipe movement and a spacer that actually displaces in turbulence, and a job with correct volumes and 40 % standoff still leaves a channel. Yields shift with additives and with mix-water salinity, so a job designed on these numbers must be re-checked against the blend report.
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.