Seal and cement above high-pressure lower completion
Off-bottom cementing challenges
Ensure high pressure resistant annular barrier
Annulus cementing is essential as a primary well barrier to secure the environment, and ensure the efficiency of high pressure stimulation operations below.
Effectively placing primary cement above an uncemented completion can be difficult. This is particularly challenging when the well will be subjected to high pressure stimulation (fracturing) and a complementary high presssure annulus barrier is required below the cement.
Solution
Saltel Steel Packer combined with a stage collar or a DV Tool is run as part of the production string. The Packer can be set inside the previous casing shoe, or in the open hole below. The cement is pumped through the stage collar and placed above the expanded packer.
After closure of the cement port, the casing integrity is restored, allowing high pressure stimulation to be performed. The packer acts as an additional barrier to both seal the annulus and protect the cement.
| _ | Xpandable steel ECP-C | Xpandable steel AZIP-C 1-0 |
|---|---|---|
| Mounting | Crimped | Crimped |
| Valve system | Lock valve closing permanently packer expansion port, and trapping fluid inside packer | Lock valve closing permanently packer expansion port. Annulus compensation valve (one side) |
| Sealing System | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal | Deformable corrosion-resistant alloy (CRA) sleeve with elastomer seal |
| Reliability | Life of well valve system | Life of well (Sweet and Sour environment) |
| Performance | High DeltaP achieved with moderate setting pressures | Self energized High pressure differential from one direction Unaffected by temperature variations |
| Max DeltaP Compensated | Up to 5,000 psi, lower for bigger sizes | Up to 3,000 psi depending on diameter and sleeve thickness |
| Max DeltaP Not Compensated | Up to 5,000 psi, lower for bigger sizes | Up to 3,000 psi depending on diameter and sleeve thickness |
| Max Temp. | 250 degF - 120 degC | 302 degF - 150 degC |
| Qualification | API 19 OH V2 | API 19 OH V1 |
