Xpandable AZIP (Annular Zonal Isolation Packer)
AZIP working principles
The Annulus Zonal Isolation Packer comes up fixed onto the completion casing, either by welding or crimping. First, the operator applies Hydraulic differential pressure in the completion casing. therefore, this differential pressure reaches an expansion point and deforms the metallic sleeve of the packer until contact with the formation or casing.
As a result, the stainless steel plastic deformation creates a solid and permanent annulus seal. Designed for zonal isolation requirements, Saltel Xpandable AZIP can operate as cased hole or open hole packer.
Zonal Isolation – Features and benefits with Saltel Packers
The packer is built on a one-piece mandrel by welding or crimping, with no hidden internal connection. Both ends are fixed and protect the expandable sleeve while running into the well. In addition to providing zonal isolation, the packer expansion also centralizes the casing string. Welded Zonal Isolation Packers are available in standard materials and provide life-of-well isolation in sweet environments. Crimped Zonal Isolation Packers are available in both standard and customized materials, and are suitable for sour environments.
- Easy RIH
- Sets quickly
- Ensures high-pressure life of well seal.
- Premium options for annulus Zonal Isolation
- Sealing efficiency even in oval, out-of-gauge, and irregular boreholes.
- The packer seals reliably through thermal cycling and temperature fluctuations.
- No special well fluid required for expansion
- Saves time with on-demand expansion and immediate sealing.
Pressure compensation systems available in certain steel packer versions, provide very high differential pressure ratings, far above competing technologies in the industry.
Similarly, we record more and more successful operations and the notion of a steel barrier between casing and borehole now appears as a field-proven technology. Subsequently, we can expect expandable steel packer technology becoming one of the industry standards in annular integrity. Cement has served for annulus isolation for over 100 years. Replacing it by a steel barrier would be the next revolution in the oil industry!
The sealing is achieved with a layer of bonded elastomer on the outside of the metallic sleeve which molds the borehole geometry. It enhances the sealing efficiency and reliability, while minimizing formation stress at the packer/borehole interface. Dynamic seals can be mounted between steel rings. This dynamic design enhances the sealing capacity and increases the temperature rating. The end-fittings protect the expandable sleeve while running in the well.
Annulus Zonal Isolation Packers : More details
Saltel Zonal Isolation Packer uses proprietary expandable stainless steel technology and a patented thin layer of bonded elastomer to achieve Zonal Isolation during injection, production, and cementing operations. Each Zonal Isolation Packer displays specific features and performances depending on the application and the well configuration.
To achieve complete setting of the Zonal Isolation Packer the lower end of the string needs a seal – with a plug or a wash pipe. Pumping from surface increases the internal pressure. This pressure enters the packer’s stainless steel sleeve through the expansion port. The sleeve expands out into the annulus between the casing and borehole or outer casing string, conforming to the shape of the wellbore or casing and isolating the annulus below the Zonal Isolation Packer from the annulus above. Alternatively, operators can use one or numerous packers depending on the application:
- Selective multizonal production
- Preventing zonal crossflow
- Conducting multizonal acidizing
- Shutting off a water zone
- Multizone isolation
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