Off-Bottom Cementing above high-pressure completion

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Seal and cement above high-pressure lower completion

Off-bottom cementing challenges

off bottom cementing above hp uncemented completion 01

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-CXpandable steel AZIP-C 1-0
MountingCrimpedCrimped
Valve systemLock valve closing permanently packer expansion port, and trapping fluid inside packerLock valve closing permanently packer expansion port.
Annulus compensation valve (one side)
Sealing SystemDeformable corrosion-resistant alloy (CRA) sleeve with elastomer sealDeformable corrosion-resistant alloy (CRA) sleeve with elastomer seal
ReliabilityLife of well valve systemLife of well (Sweet and Sour environment)
PerformanceHigh DeltaP achieved with moderate setting pressuresSelf energized High pressure differential from one direction
Unaffected by temperature variations
Max DeltaP
Compensated
Up to 5,000 psi, lower for bigger sizesUp to 3,000 psi depending on diameter and sleeve thickness
Max DeltaP
Not Compensated
Up to 5,000 psi, lower for bigger sizesUp to 3,000 psi depending on diameter and sleeve thickness
Max Temp.250 degF - 120 degC302 degF - 150 degC
QualificationAPI 19 OH V2API 19 OH V1