Figure F13. Schematic cross section of drilling Scenario B, in which the reentry hole has three casing strings, a 20-in string that extends ~80 m into sediments, a 16-in string that extends ~20 m into basement, and a 13³/₈-in string that extends deeper into basement across an unstable zone. The existence of unstable zones is an unknown at this point, but such zones may be present and will be stabilized through the use of casing when feasible.

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