Wellbore Integrity Solutions (WIS) provided an innovative solution to mill a 95/8 inch window, using tools capable of drifting a 7 inch scab liner above desired window depth.

Milling a single casing window below a scab liner, using dual casing milling technology for the first time.

Results:

• Successfully clean / scrape 9⅝ inch casing ID using the 6000 HRU, before running ProMILL Duo*.
• Deployed 6000 ProMILL Duo* through a 7 inch scab liner ID to open a window in the 9⅝ inch casing.
• Completed 150 feet window to enable well plug and abandonment 

*Mark of Wellbore Integrity Solutions.