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
Weighting material for a mud weight change
Sacks of barite to take a system from one mud weight to another, the volume it adds, and how much mud to discard if the pits cannot grow.
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How it is calculated
- Barrels of weighting material per barrel of mud = (W₂ − W₁)/(W_material − W₂), from a mass balance on the blend.
- Mass = that volume × material density × 42 lb per barrel-ppg; sacks = mass / sack weight.
- In fixed-volume mode, the discard is V·x/(1+x) so that the pits end where they started.
Where this stops being true
It is a mass balance on two clean components and nothing else. It ignores the water or oil you will add to keep the mud pumpable, the low-gravity solids already in the system, and the fact that barite that does not go into suspension goes into the bottom of the pit. Weigh what the pits actually take, not what this says they should.
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.