Formations to be Drilled!
Expected formations during drilling are listed according to their TVDs from Rotary Kelly Bushing (RKB). Lysing and Top Peder K56 are possible hydrocarbon bearing formations.
Planned Well Sections
6507/4-3 S Peder is planned to be drilled in conventional five hole sections. In 12-1/4" section, an unconventional 10" casing is planned with sour service grade. This depicts that engineers are prepared to handle high pressure sour gas through this casing.
An overview of hole sections are described below with the summarized overview at the end.
36” x 42” Section
36” x 42” section is planned to drill from seabed at 468 meters up to measured depth of 535 m from RKB using 1.03 sg sea water as mud. 36” x 30” Conductor casing will be cemented with casing shoe at 530 meters, after successful drilling of the section.
In 26” section, initially 9-7/8” pilot hole will be drilled as precautionary measure against shallow gas kick or water kick. 9-7/8” pilot hole will be drilled up to complete depth of section i.e. 1,386 m (top of Kai formation) using sea water of 1.03 sg as mud. All the cuttings generated from the section will be deposited on seabed.
17-1/2” section will be drilled from 1,391 meters up to 2,513 m MD through Kai, Brygge and Springar formations, using 1.55 sg oil base mud. The well will kick off in Springer formation from 2,133 m MD up to maximum inclination of 15 degrees. At 2,513 m MD, 13-3/8” casing will be run with shoe at 2,508 m MD. Top of the cement on the 13-3/8" casing is planned 600 m MD above the shoe and will be part of the cross-sectional P&A barrier plug against the Lysing formation.
12-1/4” section will be drilled to the top of Peder K56 reservoir using 1.7 sg oil base mud. During this section, Springer, Lysing, and Base Lysing/Top Lange formations will be drilled. In the last formation, the well inclination will drop from 15 to 0 degrees. 10” casing will be set to seal the wellbore with shoe at 3,641 m MD.
8-1/2” section will be drilled in Peder K56 reservoir section using 1.77 sg oil base mud. In case of commercial success, 7” Liner will be run and set in this section with top of liner inside 10” casing having 100 meters of overlap with it.
Overview of Well Path
The well will be kicked off at 2133 m in Springar formation. Maximum inclination will be 15 degrees and horizontal displacement will be almost 330 meters from the origin. Here publicly available data and “Pro Well Plan” was used to back calculate the well path which is very close to the original planned well path.
Operational Analysis for 12 1/4" hole
For drilling 12 - 1/4" section, parameters were set and the resultant operations were analyzed. Details of Drill pipe and BHA were included for the calculations.
Based on these parameters, calculations were performed for the drilling of 12 - 1/4" section with one click. Pressures inside and outside of drill string, torque values across the drilling depth, axial tensions for drill pipe, hook load and tensile limit graphs were generated for technical analysis as shown in figure below. A risk list was also created using technical calculations along with possible suggestions, for a more efficient and safer drilling operation.
Such analysis can also be performed for other well sections and operations, like RIH, POOH, cementing and casing.
Time vs Depth Graph
Expected dry hole drilling days are 53. On the basis of positive logging/DSTs results, further testing days are planned to be 87. Possible distribution of days for each section based on standard operations time is visualized in following graph.
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