Compartmentalized isolation with annulus packers for selective acid stimulation
Challenge
Matrix acidizing requires precise flow and pressure control. Saltel Expandable Steel packers placed along the casing string to split the long length of the annulus into shorter sections will allow proper placement of the treatment.
Solution
Annular Zonal Isolation Packer (AZIP) simulates the combined effects of differential pressure and temperature cycles.
Selecting the adequate material and elastomer skin to meet the downhole conditions allows multiple acid treatments during the life of the well.
| _ | Xpandable steel AZIP-C 0-0 | Xpandable steel AZIP-C 1-0 | Xpandable steel AZIP-C 1-1 |
|---|---|---|---|
| Mounting | Crimped | Crimped | Crimped |
| Valve system | Safety closing valve | Lock valve closing permanently packer expansion port. Annulus compensation valve (one side) | Lock valve closing permanently packer expansion port. Dual Annulus compensation valve (both sides) |
| Sealing System | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal |
| Reliability | Life of well (Sweet and Sour environment) | Life of well (Sweet and Sour environment) | Life of well (Sweet and Sour environment) |
| Performance | Differential pressure hold by steel sleeve mechanical resistance Unaffected by temperature variations | Self energized High pressure differential from one direction Unaffected by temperature variations | Self energized High pressure differential from two directions Unaffected by temperature variations |
| Max DeltaP Compensated | Up to 3,000 psi depending on diameter and sleeve thickness | Up to 3,000 psi depending on diameter and sleeve thickness | Up to 3,000 psi depending on diameter and sleeve thickness |
| Max DeltaP Not Compensated | Up to 3,000 psi depending on diameter and sleeve thickness | Up to 3,000 psi depending on diameter and sleeve thickness | Up to 3,000 psi depending on diameter and sleeve thickness |
| Max Temp. | 302 degF - 150 degC | 302 degF - 150 degC | 302 degF - 150 degC |
| Qualification | API 19 OH V1 | API 19 OH V1 | API 19 OH V1 |
