Problem
A client in Albania had a planned sidetrack well that required a solution to isolate a high-pressure formation. The HP formation was situated just outside the milled window and required isolation from the lower pressure zone below. This would enable the drilling and stimulation of the reservoir section.
Solution and Achievement
Our 7” 35 lb/ft ReLine DL was deployed through a milled window within the 7”casing. A primary cement job was conducted prior the successful expansion into a 6-1/2” underreamed open-hole section from 3,212 m to 3,285 m MD to isolate the high-pressure formation.
With the HP formation fully isolated and the ReLine DL sealed and tied back into 7”35# casing, our post expansion ID of 5.140” allowed the operator to drill ahead to a 4 ¾” reservoir section and install the preferred 3 ½ liner for stimulation and production of natural gas.
Well parameters were analysed and our 7”, 35 lb/ft Reline DL expandable open-hole liner system was selected as the optimal solution . The ReLine DL selected will be installed into a 6-1/2” under-reamed open-hole section from 3,184 m to 3,304 m MD. Due to a section of 42.7# casing within existing architecture, custom seals were developed to enable passage through this restriction.
Key Benefits
The installation of the Re-Line DL avoided a complete re-drill of the well.
The ability to run the Re-Line DL system through the restricted liner ID within the 42.7# 7” liner was achievable due to the revolutionary recessed seal design incorporated in the upper seal assembly.
The final post expansion ID was larger than any straddle could have achieved.
