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SS-15® BigBore™ II Subsea Wellhead System

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Dril-Quip’s SS-15 BigBore Subsea Wellhead Systems allow an additional casing string, casing hanger and seal assembly (typically 18″) to pass through the 18-3/4″ wellhead with the BOP stack and riser in place

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Description

System Features:

  • The SS-15 BigBore II 18-3/4" standard wellhead is a nominal 27" O.D.
  • The SS-15ES BigBore II 18-3/4" wellhead has a nominal 30" O.D.
  • All BigBore II 18-3/4" wellheads can safely pass 18" O.D. pipe with flush O.D. connections through an 18.510" minimum I.D.
  • Rigid lockdown system preloads wellhead connection together for high fatigue life
  • 18" intermediate casing string is drilled and set in a standard BOP controlled environment
  • 22" adapter supplies landing shoulder and seal area for 18" and 16" supplemental casing hanger systems
  • All casing hangers and seal assemblies are run, set and tested on drill pipe in a single trip
  • Multiple conductor housings supply resistance to bending, are used to case off hazardous formations and accommodate complex casing programs
  • Available with annulus shut-off system to inhibit surface flow of water or hydrates
  • Easily accommodates casing programs with the supplemental casing hanger systems
  • Lockdown sleeve can be used to preload wellhead components in wellhead to inhibit thermal growth of casing strings
  • Incorporates all other features of the field-proven SS-15 Subsea Wellhead System

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