Geological formations which were expected during drilling are listed according to their TVDs from Rotary Kelly Bushing (RKB).
6507/2-6 is planned to be drilled in conventional five hole sections.
An overview of hole sections are described below with the summarized overview at the end.
36” x 42” Section
36” x 42” section was planned to drill from seabed at 369 meters up to 452 meters from RKB using 1.03 sg sea water as mud. 30” x 36” casing then be installed and cemented to top after successful drilling of the section.
9-7/8” pilot hole was planned to drill upto depth of 1,300 m using sea water of 1.03 sg as mud prior to drilling of 26" hole. 20" casing was then run and cemented to top of seabed. BOP and Riser was then planned to be installed. All the cuttings generated from the section were deposited on seabed.
17-1/2” section were planned to be drilled from 1,300 meters up to 2,700 meters through Kai formation, using oil based mud. 14" x 13-3/8" casing string was planned to run and cement with top of the cement, 200 meters above the its shoe i.e. 2500 meters. This reduced cement depth allows the retrieval of 13-3/8" casing after the decision of plugging the well permanently.
12-1/4” section was planned to the Base Cretaceous Unconformity (BCU) in Lange formation, using oil base mud. During this section Lange formation was drilled. 9-7/8” liner was set with 50 meters overlap to 13-5/8" casing and its shoe at 3,958 meters.
8-1/2” section was planned to drill through Lange, Garn, Ile and Tilje formations using oil based mud. There is no liner planned for this section and open hole tests were planned to be performed. Well was then planned to be plugged and 13-3/8" casing retrieved.
This was planned to be a vertical well. Tortuosity can be manually added in Pro Well Plan for calculation purpose.
Expected Time vs Depth chart
If planned 68 days for operation were distributed among sections, then we get the following Time vs Depth Chart describing total time spent on each section.
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