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Deployed by 2 companies

Permanent Perforation Shut Off System

Page last modified
June 17 2024

Throughout the life of a well, it may be necessary to isolate existing perforations for the purpose of re-completing an alternative section of the wellbore or to stop water from being produced. Traditional methods involve setting a plug, straddling the perforations or performing a cement squeeze, all of which can be complex and costly and in the case of a straddle, result in a reduced ID wellbore.

TAQA has developed ZoneStop, a cost effective, low complexity, patent protected method to isolate existing perforations and allow water shut off or re-completion to take place. ZoneStop uses TAQA’s patented, field proven swelling elastomer technology. ZoneStop sized swellable elastomer particles are pumped from surface into existing perforation tunnels and allowed to swell in-situ to provide an effective high pressure seal up to 10,000psi. The ZoneStop particulates are batch mixed at surface and pumped downhole using standard cementing equipment. The design and volume of the particulate
material and carrier fluid are based on the length of the zone to be isolated.

ZoneStop's proprietary water swellable particles use a combination of super absorbent polymers and osmotic swell mechanisms to optimise speed and strength.



  • Forms tight and permanent seal when swollen
  • Uses field proven, proprietary osmotic swell mechanism
  • Chemical and temperature resistant (up to 250 Deg C)
  • Plug design tailored for well conditions
  • Pumped using standard pumping equipment


  • Maintains full bore access
  • Operationally simple to deploy
  • Suitable for all environments
  • Multiple applications; water shut-off, recompletion, P&A, Cementing
  • Permanent swell, unaffected by saturation
  • Plug withstands significant pressure drops



Pros & Limitations
Permanent shut off of perforations
Easy to mix and deploy via standard pump equipment
No chemical required
Fast swelling in downhole conditions (ca. 2-3 hrs, depending on Temp and Salinity conditions)
Cannot be pumped through certain sized restrictions (eg <3.5mm)
Specification Title Specification Description
ZoneStop Fine
Particulate water swellable elastomer 100 - 400 microns size
ZoneStop Coarse
Particulate water swellable elastomer 1-3mm size
ZoneStop Density
1.44 g/cm3


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Development Technology demonstration Mature / Proven
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TAQA Well Completions is a global specialist in advanced completions, production solutions and sand management for the oil and gas industry.

From simple to complex well designs, the company has extensive track record in enhancing productivity for clients’ reservoirs offshore and onshore. TAQA Well Completions invests in research and development, bringing to market disruptive technologies and offering solutions targeted to operators’ specific production challenges.

Established in 2009, TAQA Well Completions operates globally: regional hubs in Europe, Asia Pacific, Middle East, North America

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