Ive just dropped in so not really sure why they are Milling a...

Ive just dropped in so not really sure why they are Milling a Window?

They've either had hole problems or cant hit target from where they are/were?

SO....

1. Would have had to Pull Out Of Hole (POOH)
2. Make up Cement Stinger (Usually 2 7/8" or 3.5" Tubing at bottom of drillpipe.
3. Run In Hole (RIH) to desired depth for CMT Plug.
4. Pump CMT
5. POOH +/- 100m or so above calculated Top of CMT...
6. Wait On Cement (WOC) "wait long enough for CMT to harden"
7. RIH and tag Top Of CMT (Tag TOC) "to be sure it was there where it was suppost to be.
8. POOH and make up some kind of Whipstock Tool "A wedge like tool set inside the CSG that will force the Mill to a specific direction and Mill a window in the CSG.
9. POOH and make up a Drilling Log While Drilling/Measure While Drilling (LWD/MWD) ASSY.
10. RIH and Cont Drilling Ahead.

A good few days of Rig Time eaten up + CMT costs + Milling tool costs (a Few $$$ spent)