Structural Pipe Casing Strings

Casing strings used to facilitate the drilling of the well, but not needed for pressure containment after the well has been drilled. Support unconsolidated sediments and provide hole stability for initial drilling operations, axial support for casing loads and bending loads from the subsea wellhead.

Source: API RP 90, Annular Casing Pressure Management for Offshore Wells, Upstream Segment. First Edition, August 2006. Global Standards

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