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P18 · I.06(c) · Tools · Industrial · Casing design framework

Casing design framework — VME, CwD, SET, GRE

From classical API TR 5C3 uniaxial limits through the triaxial Von Mises ellipse to Casing While Drilling, expandable tubulars, GRE and connection envelopes. Design factors stay constant; applied loads get more severe.

CASING-DESIGN-FRAMEWORK-2026 · rev.11G · Excel Limit Check v6H · 18 August 2026 · François Dorléans · partner comments locked

Casing Design Limit Plot — triaxial Von Mises with Design Factors
Classic VME Design Limit Plot. Load cases must stay inside the inner (design-factor) envelope.
Present · DFKPS Base dossier · PDF rev.11G Excel Limit Check v6H I.06(a) Drilling SOA I.06(b) Low carbon Industrial tools

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1. Introduction and scope

2. Hierarchical schema of technical subjects

3. Sequential progression of the design process

4. Classical design basis (API TR 5C3)

5. Triaxial design — Von Mises ellipse

Classic VME Design Limit Plot with Design Factors and load points
Figure — Classic VME Design Limit Plot (7″ 29 ppf L80). Outer ellipse = yield; inner dashed ellipse = design factor applied. A deliberate CwD point sits outside the DF envelope (FAIL).

6. Design factors remain constant

7. Casing While Drilling — increased load cases

8. Solid Expandable Tubulars

9. GRE specific constraints

10. Material selection and PREN

11. Connection limits on the design-limit plot

12. Contingency and operational philosophy

14. References