Frac Sleeve System & Method - Reclosable CT Frac Sleeve | Schlumberger
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CoilShift Precision

CT frac sleeve

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Add flexibility to your completion with reclosable CT-operated frac sleeves

Our CoilShift Precision CT frac sleeve enables selective single-point multistage stimulation and adds reclosable flexibility for rigless zonal shutoff later in the life of the well.

The two-position fullbore sleeve is designed for high-pressure and high-rate hydraulic fracturing operations. The inner sleeve is run in a pinned configuration and sheared when desired, providing positive indication that the specified port has opened before fracturing.

CoilShift Precision sleeves can be opened, closed, and reopened, enabling operators to tailor production over the life of the well using the CT frac sleeve shifting tool. An adjustable detent locking system locks the sheared sleeve to prevent accidental manipulation and provides operators with reliable weight indicators to mark when the sleeve has shifted.

reclosable ct frac sleeve
Rated to 10,000 psi [69 MPa]
Rated to 285 degF [141 degC]

Shift sleeves reliably

The shifting tool has been engineered as a fracture-in-place solution with no requirements for isolation or related service tools, even after hundreds of stages are fractured. The fully compartmentalized and hydraulically balanced design with multiple layers of solids control ensures that no solids will interfere with the tool's operation.

Stage 1. Pumping through the shifting tool results in a hydraulic differential that extends three sets of paired keys (six keys in all). The keys extend uniformly as the CT string is pulled upward toward the sleeve to be shifted.
Stage 2. The leading keys of each pair deflect over the inner sleeve to pass freely. As the CT string continues to pull, the rear keys latch onto the sleeve, creating tension that eventually exceeds the shear pin setting. The sleeve is designed to shift even if only a single key latches, adding redundancy for maximum reliability.
Stage 3. When the sleeve is fully actuated (100% open), the leading keys reach a kickoff profile in the upper sleeve cavity, retracting all the keys and releasing the sleeve.
Stage 4. The CT string loses tension, indicating that the sleeve has shifted and the tool can be pulled through the sleeve cavity. If a sleeve is partly shifted, the keys will retract only after the operator stops pumping and releases the hydraulic differential pressure.
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Product Sheet CoilShift Precision CT Frac Sleeve

Selective single-point multistage stimulation and flexibility for rigless zonal shutoff later in the well's life.

Case Study Schlumberger Fracturing Team Saves 24 Hours of Rig Time, Permian Basin

Reclosable CT frac sleeves enable completion of 37 frac stages in just 55 hours and provide subsequent zonal management flexibility.

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