WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
240 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 During RIH of the DST string the sample carrier was over-torque to 14000 ftp instead of 4000 ftp. . . .


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Wellesley
241 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 While running the Surface Test Tree (STT) and attempting to make up the Upper stiff joint connection . . .


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Wellesley
242 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 During P/U weak link bails, the electric remote control was switched off on the shute. Due to the . . .


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Wellesley
245 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 There were 5 wireline drums on the rig during wireline logging and logging on DP. The operations . . .


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Wellesley
246 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 Inner bushing with cut-out for wireline was not mobilized for this wireline conveyed logging job. A . . .


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Wellesley
247 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 During sampling it was found out that the exit point was not consistent to be on top of the FTWT . . .


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Wellesley
248 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 Max flowrate for extracting formation fluid with the FTWT tool was said to be 6-7 lpm. During this . . .


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Wellesley
249 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Reservoir section 16/06/2020 N/A


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Wellesley
257 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 Drilled 2 x wiper plugs and landing collar in 45 minutes using a milled tooth rock bit. 300 litres . . .


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Wellesley
258 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 The mud engineer made a good displacement plan for displacing the well from SW to 1.25 sg mud. The . . .


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Wellesley
259 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 The cold temperature in the riser and 300 m below seabed made the WBM more viscous than under normal . . .


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Wellesley
260 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Reservoir section 16/06/2020 Noticed several times that “slugs” of cuttings would reach the shakers for no good reason.


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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
185 – Wellesley

Transocean Arctic Logistics Operational 35/12-7
Serin
Reservoir section 05/02/2019 Stethoscope tool became primary means of taking pressure acquisition. Initial 14 pressure points . . .


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