Bore and annular volume
Calculate cylindrical or annular volume with an explicit allowance.
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Formula and assumptions
Use one uniform cylindrical section; length is along the bore, not TVD. Use internal casing/hole diameter and the outside diameter of any inner pipe. Washouts, joints and fluid losses are excluded. The allowance is user-selected; this is a geometric estimate, not a cementing programme.
V = π / 4 × ((D / 1000)² − (d / 1000)²) × L; Vₑ = V × (1 + excess / 100)Method references
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