Subsea Wellhead

Wellhead that is installed at or near the seabed.

Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards

Subsea Wellhead

Assembly used during drilling, completion and production operations that has provisions to lock and seal to a subsea BOP stack, to a subsea tree, to a high pressure drilling riser or to a top-tensioned production riser.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Subsea Wellhead

Wells drilled and completed with a subsea wellhead located near the seafloor.

Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards


Subsea Wellhead

Wellhead assembly used during drilling and completion operations that has provisions to lock and seal to a subsea BOP stack and to the subsea tree.

Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards


Subsea Wellhead

A wellhead that is used with a floating drilling rig that uses a subsea BOP stack for well control. The subsea wellhead is usually connected to the surface casing string and all subsequent casing strings are installed, landed, and sealed inside the subsea wellhead’s high pressure housing, immediately below the BOP. The well can be completed in one of two methods: 1. Using a subsea tree (subsea well). 2. Using one or two production risers leading back to a surface casing head, tubing head/tubing hanger, and christmas tree (hybrid well).

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

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