Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Nominal collapse

Nominal collapse pressure without axial load in megapascals.

Yield strength

Casing minimum yield strength in megapascals.

Axial load

Axial tensile load in kilonewtons.

Area

Casing cross-sectional area in square millimetres.

Derate the nominal collapse pressure of casing for combined axial tension using the API biaxial correction. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Axial stress

Axial stress in megapascals.

Stress ratio

Ratio of axial stress to yield strength.

Corrected collapse

Biaxially corrected collapse pressure in megapascals.

• Drilling and casing calculations depend on well geometry, fluid rheology and density, temperature, pressure, surge and swab, kick scenario, cement placement, wear, connection strength, transient hydraulics, and operator standards.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Casing Burst Pressure Calculator

  Compute the API-style internal burst resistance of casing using the Barlow formula with a 87.5 percent wall tolerance factor.

• Casing Collapse Pressure Calculator

  Compute the thin-wall external collapse resistance of casing from yield strength, outside diameter and wall thickness.

• Casing Tension Calculator

  Compute the effective axial tension at surface for suspended casing, including the buoyancy effect of drilling fluid.