Our client in Albania had a planned sidetrack well that required a solution to isolate a high-pressure formation, just outside the milled window, from lower pressure zone below, to enable the drilling and stimulation of this reservoir section.
Project Details
Location : Albania
Rig details: Land
Parent casing: 7” 35 lb-ft and 7”42.7
lb-ft run through.
Window information
Top of Window: 3,207m
Bottom of Window: 3,211m
Open hole: 5.625” opened up
to 6.500”
Drilling fluid type: WBM Salt/Gypsum
Mud weight: 1.54/1.59
gr/cm3
Solution
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 3,184m to 3,304m MD.
Due to a section of 42.7# casing within existing architecture, custom seals were developed to enable passage through this restriction.
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 to the successful expansion into a 6-1/2” underreamed open-hole section from 3,212m to 3,285m 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, install preferred 3 ½ liner for stimulation and production of natural gas.
