WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
236 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 720 litres of crude oil was left in bottom of well after MDT sampling on wireline. The MDT run was 2 . . .


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Wellesley
237 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 Had to break and re-M/U several joints on Vallourec 7″ 32# P-110 Vam 21 liner due to coating on 7″ . . .


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Wellesley
238 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 It took a lot of force to stab 2 x wiper plugs and 2 x cup testers into the 7″ liner. These items . . .


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Wellesley
239 – Wellesley

Transocean Arctic Well test Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 Only able to pump with 2500 lpm while cleaning up 9 5/8″ casing and displacing from OBM to brine.


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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
243 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Intermediate section 16/06/2020 The remote operated lo-torq valve was installed with an elbow between side inlet and lo-torq, while . . .


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Wellesley
244 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
Intermediate section 16/06/2020 Making up cmt. Stand into landing string prior to landing 9 5/8″ casing was done by use of chain . . .


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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
250 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
P&A 16/06/2020 N/A


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Wellesley
251 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 A
Grosbeak
P&A 16/06/2020 N/A


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Wellesley
252 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Top hole 16/06/2020 When cement was in place and 10 MT weight was slacked off conductor to set it on bottom, noticed the . . .


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Wellesley
253 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Surface section 16/06/2020 The back-up 18 3/4″ wellhead assembly was sent out incomplete, without running tool, 9 m DP mandrel, . . .


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Wellesley
254 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Surface section 16/06/2020 Used 2 x pup joints due to aim of +-2 m rathole. The 2 m pup was difficult to make up due to the . . .


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Wellesley
255 – Wellesley

Transocean Arctic Drilling Operational 35/4-2
Songesand
Top hole 16/06/2020 The handling pup was 3 m which was not long enough to get the WH below rotary and get the tuggers up . . .


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