WE Report

Lessons Learned

Lessons Learned865


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

Wellesley
498 – Wellesley

Borgland Dolphin 6204/11-3
Schweinsteiger
09/09/2020 Increased MW to 1.20 SG on bottom of 12 1/4″ section

Drilling Supervisor


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Wellesley
483 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Surface section 05/09/2020 Ran MPT tool dressed to pull extended wear bushing. Successfully engaged and sheared out but hung up . . .

Drilling Supervisor


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Wellesley
481 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 03/09/2020
Made up shoe track to maximum torque. On attempting to change torque values in JAM system to optimum . . .

Drilling Supervisor


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Wellesley
476 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 02/09/2020 Due to shallow gas zone at 331m, needed to fill casing with mud to be ready in case of need to wash . . .

Drilling Supervisor


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Wellesley
474 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 01/09/2020
Hit shallow gas at 331m, only 24m below 36″ conductor shoe. Killed with 1.50 SG kill mud. Drilled . . .

Drilling Supervisor


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Wellesley
475 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 01/09/2020
Hit shallow gas at 331m, only 24m below 36″ conductor shoe. Killed with 1.50 SG kill mud. Drilled . . .

Drilling Supervisor


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Wellesley
464 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 27/08/2020 No fill on 36″ hole wiper trip. Ran 30″ conductor, found 1m fill on bottom. Washed to bottom, picked . . .

Drilling Supervisor


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Wellesley
465 – Wellesley

Borgland Dolphin Drilling Operational 6204/11-3
Schweinsteiger
Top hole 27/08/2020 Good suggestion from Dolphin not to do this as in past fibreglass tubing has broken due to vibration . . .

Drilling Supervisor


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Wellesley
233 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 S
Grosbeak West
Surface section 16/06/2020 Several joints had to be broken out and made up again due to difficulties with centralizing joints . . .


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Wellesley
234 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 S
Grosbeak West
Production section 16/06/2020 Good experience M/U 9 5/8″ VAM21 CWD2 joint with drilling bails rather than longer casing bails. . . .


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Wellesley
235 – Wellesley

Transocean Arctic Drilling Operational 35/11-21 S
Grosbeak West
Reservoir section 16/06/2020 Dropped 2 15/16″ drift to check 5 1/2″ DP/HWDP prior to coring (coring ball 1 1/4″). The drift was . . .


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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
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
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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