Seal in the annulus and isolate troublesome loss zone section
Challenge
A single stage cementing operation can be requested to start cementing only above the loss zone, in case it is located at the bottom of the well.
Solution
The cement packer will be thus positioned and expanded in the openhole section for a one-stage cement job, once the annulus is sealed below.
| Xpandable Steel ECP-W | Xpandable Steel ECP-C | |
|---|---|---|
| Mounting | Welded | Crimped |
| Valve system | Fluid trapping (check valve) + safety closing | Lock valve closing permanently packer expansion port and trapping fluid inside packer |
| Sealing System | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal |
| Reliability | Short term annulus seal | Life of well valve system |
| Performance | High DeltaP achieved with moderate setting pressures | High DeltaP achieved with moderate setting pressures |
| Max Delta Pressure Compensated | Up to 5,000 psi, lower for bigger sizes | Up to 5,000 psi, lower for bigger sizes |
| Max DeltaP Not Compensated | Up to 5,000 psi, lower for bigger sizes | Up to 5,000 psi, lower for bigger sizes |
| Max temperature rating | 250 degF - 120 degC | 250 degF - 120 degC |
| Qualification | API 19 OH V2 | API 19 OH V2 |
