Well WAI 00000 JPG

WAI - Welltec® Annular Isolation

Introduction

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.

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.

  • Challenge
    Zonal control
  • Applications
    Cement replacement, selective production, water shut off
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Overview

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

APPLICATIONS

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

FEATURES

  • Rugged, all welded, metallic construction
  • Expansion assurance
  • High expansion capability
  • Constant, high pressure ∆p over full expansion range
  • No premature expansion
  • NACE compliant
  • Slim OD allows for high rate circulation during deployment

BENEFITS

  • Rotatable during deployment enabling liner to TD in challenging environments
  • No Under-reaming / no extended shoe tracks
  • Pinpoint perforation for production / stimulation intervals
  • Isolates water production
  • Rapid set nature of WAI reduces time to production
  • High rate circulation capability
  • No CBL required across reservoir section
  • WAI can be expanded online or offline
  • Full bore – as per casing / tubing

Specification Range

Expansion range 6.00" 10.00”
Min. running OD 5.75” 8.18”
Base pipe range 4 ½” 7”
Max. internal pressure 5000 psi 8500 psi
Constant element ΔP across expansion range 2000 psi 4000 psi
Max. temperature 302°F / 150°C
Max. element length 30 ft / 10 m
ID Full bore (as per base pipe)
ISO14310 Standard V3
Standard elastomers & seals HNBR / Aflas / FFKM / PTFE
Standard material 316 / Alloy 28