| Engineer | Form: (06 )
400867094
8/11/2015 | Note change in plugging procedure:
1) Submit Form 42 electronically to COGCC 48 hours prior to MIRU.
2) No CBL on file. Run CBL to verify the top of primary cement is at least 200’ over Niobrara and at least 200’ below Shannon to 200’ above Sussex as all these zones are productive in this area. If cement in either interval is not present add this coverage by perforating and squeezing.
3) Deepen CIBP #2 from 600' to 700' based upon induction log aquifer zones.
4) Shoot squeeze holes at 690' instead of 590'. Adjust cement volumes upwards from proposed 180 sxs accordingly.
5) For 690' plug: pump plug and displace, shut-in, WOC 4 hours and tag plug – must be 375’ or shallower. If shoe plug not circulated to surface then place 10-40 sx inside casing and annulus at surface. Leave at least 100' for each plug.
6) Properly abandon flowlines as per Rule 1103. File electronic Form 42 once abandonment complete.
7) Please submit existing gyro survey data with Form 6 (s) Subsequent Report of Abandonment.
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