WE Report

Lessons Learned

Lessons Learned865

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Operator Rig Discipline / Origin Project Phase Well Section Date What Happened

Faroe
283 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 P&A 01/10/2019 Used smaller “Sea Owl” for subsea observation while cutting surface casing strings. This allowed . . .


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Wellesley
206 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 07/02/2019 Unable to release CRTi tool after using it for the first time (above). Spent 30 min. And called . . .


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Wellesley
210 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 07/02/2019 Problems experienced with poor quality of pre-doped connections. Remains of rusty water and storage . . .


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Wellesley
212 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 07/02/2019 All 3 wiper plug shears & burst were clearly seen during this cement job; bottom plug shear, top . . .


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Wellesley
218 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Reservoir section 07/02/2019 While RIH with 8 1/2″ BHA, noticed 2 cm missing from one of slip segments. Checked rest of dog . . .


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Wellesley
225 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 P&A 07/02/2019


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Wellesley
226 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 P&A 07/02/2019 Neck on lower part of MPT too short for making up MPT to DP with IRN when using 13 3/8″ adapter for . . .


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Wellesley
227 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 P&A 07/02/2019


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Wellesley
229 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 P&A 07/02/2019 The cutting assembly was spaced out wrong from Slb in town. Bull nose and bottom stab below cutter . . .


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Wellesley
230 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 P&A 07/02/2019 Both primary and secondary cutter assembly was delivered with 6 5/8″ handling subs, torqued up to 50 . . .


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Wellesley
184 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 Production section 05/02/2019 Had to lay out several joints due to missing threads on top of pin ends, (9 5/8″, #53.3, P-110, . . .


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Wellesley
186 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Halliburton recommended to rotate the string while setting the P&A plugs, but did not supply a . . .


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Wellesley
192 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-7
Serin		 P&A 05/02/2019 Believed that the HP housing lock ring was not set or only partially set, alternatively it was . . .


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Wellesley
194 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The stop ring for balloon centralizer on the inner string cmt stinger was installed on top of . . .


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Wellesley
195 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The WHIM or “funnel” on the seabed for pumping mud up to the rig, filled up with gumbo and large . . .


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Wellesley
196 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 N/A


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Wellesley
199 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 The Franks CRTi tool was made up to top drive before csg entered OH. With the water depth and OH . . .


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Wellesley
200 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Surface section 05/02/2019 Disadvantage of using MRR system: Drilling top hole with reactive clay formations using mud will . . .


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Wellesley
205 – Wellesley

 		Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen		 Production section 05/02/2019 Double float valves in shoe failed at around 900 m, still inside 13 3/8″ casing. Mud flowed back . . .


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DNO
318 – DNO

 		Island Innovator Drilling Planning 6507/7-16 S
Canela		 N/A 07/01/2019 Used the 1 x 2 m pup, had we crossed threads we had no back-up.


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