WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
261 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 After unlatching the BOP we forgot to remove the AX ring from the wellhead prior to pulling the BOP. . . .


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Wellesley
263 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
P&A 16/06/2020 As on all previous wells, with the well displaced to seawater and wellhead cutting operations . . .


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Wellesley
265 – Wellesley

Transocean Arctic Drilling Operational 25/1-13
Balcom
P&A 16/06/2020 Unable to run Weatherford 9 5/8″ casing cuting assembly past wellhead. Found out that spiral . . .


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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
213 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 Trip sheet from Geoservice and Transocean has shown different numbers. In addition, gains have been . . .


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Wellesley
214 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Investigated two sensor systems in TT.


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Wellesley
215 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019


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Wellesley
216 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 After POOH with 8 1/2″ BHA (prior to coring), decided to not run same due to wear on teeth coating. . . .


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Wellesley
217 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Junk was found in core barrel (piece of coiled copper plated spring steel). Possibly a piece of . . .


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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
219 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Galled monel connection on LWD string when POOH from initial TD 3102 m (between sonic and crossover . . .


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Wellesley
220 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Reservoir section 07/02/2019 Not enough weight on jar when drilling with 8 1/2″ rock bit in order to drill with jar in tension. . . .


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Wellesley
224 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
P&A 07/02/2019 WOC for cement plugs in OBM prior to dressing off.


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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
231 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Rig move 07/02/2019 The rig move plan was written for using 4 AHVs. The actual rig move used 3 AHVs. Hence, the . . .


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Wellesley
176 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 5 MT WOB proved insufficient, no drilling progress in hard formation. Was allowed to increase to 10 . . .


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