Casing Design▾
Well Profile▾
Optional — for the side-profile view. TVD = true vertical depth to the lateral; KOP = where the hole kicks off vertical. Every number still works without these; only the profile graphic needs them. The side-profile draws below the Returns readout; on a phone, rotate to landscape for a larger view.
Work String▾
Enter coil ID and length to check the operator's number.
Depth & Time
Rates
Returns
Returns at surface
enter rate & depth
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To bottom
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Bottoms up
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Surface to surface
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string+annulus
Gain / Loss
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Annular velocity · per casing
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↻ Rotate for a larger view
Times run from the time sent. Coil uses reel volume; Stick estimates from depth × ID; Open flows the cased hole with no string. Annular velocity is per casing string. Gain/Loss = (pump − return rate) × 60. Surface lines not included.
Annular velocity & slip — the figure above is how fast fluid travels up the annulus (rate ÷ capacity). Cuttings don't ride it for free: each chip settles back at its own slip velocity, so what lifts debris is the net — annular velocity minus slip. Bigger, denser cuttings slip faster; turbulent flow lifts better than laminar; and a wide upper casing is where returns slow and solids linger. This tool shows the fluid velocity, not the slip — actual slip depends on cutting size, density, and fluid properties.
Spot Chemical▾
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Bbls to pump = string fill to the work-string depth (Current depth, above) + annulus up to the spot depth. Enter a chemical volume to center the middle of the slug on the spot depth (blank = leading edge). Spot depth must be at or above the work-string depth.
API 5CT casing & tubing dimensions · capacity factor 1029.4 (in² → bbl/ft) · v1.3.0 · Rev. 2026-08-20
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