Definition(s)
Production tieback
Production casing run from top of the production liner to the subsea wellhead housing NOTE The production liner tieback should have sufficient internal diameter to accommodate the surface controlled subsurface safety valve (SCSSV) and any control or chemical injection lines required for the completion. Normal clearance casing OD in.: N/A. Tight clearance casing OD in.: 10 3/4 × 9 7/8. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back.
Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards