An operator in West Texas was using frac sleeves to isolate and hydraulically fracture multiple stages in a single continuous operation. However, the operating efficiency of its existing service provider was unsatisfactory. With a tight completion schedule, the operator wanted to expedite operations and assigned its next well to SLB.
CoilShift Precision CT frac sleeves enable selective single-point multistage stimulation and add 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 fracturing operations. The inner sleeve is run in a pinned configuration and sheared when required, providing positive indication that the specified port has opened before fracturing.
The sleeve can be opened and closed multiple times, enabling operators to tailor production over the life of the well using the CT frac sleeve shifting tool. This 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 tool design ensures that no solids will interfere with its operation.
The sleeves were installed together with the casing in just 5 hours—37 sleeves in total, with one sleeve every 135 ft of casing throughout the lateral. When hydraulic fracturing was to commence, the first sleeve (near the toe of the well) was opened using CT and the proprietary shifting tool. After fracturing the zone with a 20/40 mesh proppant and overflushing, the sleeve was closed. This sequence was repeated for each successive stage in turn. The average time between opening one sleeve and the next was just 16.4 minutes (excluding fracturing time).
Once stimulation was complete, the isolation packer on the end of the shifting tool was removed to minimize friction. In addition, the end of the BHA was replaced by a wash nozzle to remove any proppant in the wellbore that could prevent the toolstring from reaching TD. The round trip to open all 37 CoilShift CT frac sleeves was swiftly completed in 8 hours.
Use of CoilShift Precision CT frac sleeves saved 24 hours of operating time compared with the third-party provider. The operator was able to stay on budget and on schedule and chose CoilShift Precision CT frac sleeves for all completions planned in this field for the subsequent year.
