Opening the FIV tool by pressure-cycling the tubing.
Achieve High Productivity Index with CT Perforating
Challenge
Perforate horizontal wells underbalanced using CT. Leave formations undamaged. Achieve high productivity indexes (PIs).
Solution
Install FIV Formation Isolation Valve to enable no-kill perforating. Apply DepthLOG service for CT depth correlation. Use PURE system and PowerJet deep penetrating charges to achieve immediate flow through clean perforations.
Results
Well REC-2H’s PI was estimated to be 4 times higher than achievable in a standard completion: its production rate reached 7,000 bbl/d. Well ROM-5’s production reached 10,000 bbl/d. Groupement Sonatrach-Agip now considers this combination of services key to future ROM field development.
Go from completion to production without killing the well
When Groupement Sonatrach-Agip needed a cost-effective, efficient method to perforate horizontal wells underbalanced in the Berkine basin, it tested an innovative application of the FIV monobore completion valve. The FIV valve was installed below a permanent completion packer. The CT perforating string, including the depth correlation service, was run to depth. After the guns were fired, a shifting tool on the bottom of the gun string closed the valve. Tubing pressure was bled off, and the guns were retrieved. An underbalanced pressure differential was then created above the FIV tool and put the well on production when the valve was reopened by a programmed tubing pressure cycle.
Protect the formation and see proof in the production rates
Groupement Sonatrach-Agip has found a solution that works in the Berkine basin. The high PIs seen in both wells confirmed the Tadrart formation was not impaired by the underbalanced CT perforating operations. DepthLOG correlation ensures the gun string is on target. The PURE system and PowerJet charges achieve deep, clean perforation tunnels. The innovative FIV underbalanced perforating technique isolates the perforated interval until the well is placed on production. This crossdisciplinary Schlumberger solution protects the formation from damage, enhances reservoir production, and improves the safety of the underbalanced operation.
Apply a successful solution to continue development
The operator now considers the FIV no-kill perforation technique key to its future development of the Berkine basin. Production from Well REC-2H, the first well perforated with the technique, reached 7,000 bbl/d. As a result of this success, Groupement Sonatrach-Agip used the FIV technique again, this time in the Rhourde Messaoud field’s ROM-5 well. Production reached 10,000 bbl/d. The operator now plans to perforate a third well using the same suite of services: the FIV tool, DepthLOG correlation, and the PURE system.
