Well WAI 00000 JPG

WAI - Welltec® Annular Isolation


The Welltec® Annular Isolation (WAI) provides long length open hole zonal isolation, significantly reducing the free annulus space between the liner (casing) OD and the open hole ID. The removal of this annular space can be beneficial in highly layered reservoirs of varying permeability, where selective production, stimulation or water shut off is required.

  • Challenge
    Zonal control
  • Applications
    Cement replacement, selective production, water shut off
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At Welltec, we design and test the WAI range (Welltec Annular Isolation) in accordance to IS0 14310 V6 to V3 leak criteria.
The WAI metal expandable sleeve is hydraulically expanded quickly, under full surface control via the application of well bore pressure using the rig pumps. Sealing on the ID of the open hole is achieved via a series of compliant, elastomeric seals, backed up by full circumferential metal to rock contact fins that prevent seal extrusion under high differential pressure.
Well WAI Vert 00000
Well WAI Hori 00000


  • Cement replacement across laminated & highly layered reservoir sections
  • Selective production
  • Selective stimulation
  • Water shut off
  • WAI can be incorporated within open hole, cased hole and hostile environments


  • Rugged, all welded, metallic construction
  • Expansion assurance
  • High expansion capability
  • Constant, high pressure ∆p over full expansion range
  • No premature expansion
  • NACE compliant


  • Rotatable during deployment enabling liner to TD in challenging environments
  • Slim OD allows for high rate circulation during deployment
  • Rapid set nature of WAB reduces time to production
  • High rate circulation capability
  • Full bore – as per casing / tubing


Expansion range 6.50" 7.25”
Min. running OD 6.10”
ISO14310 Standard V3
Max. internal pressure 8,500 psi
Constant element ΔP across expansion range 4000 psi
Max. element length 30 ft
Max. temperature 302°F
Base pipe range (up to) 4-1/2”
ID Full bore (as per base pipe)