WE Report

Lessons Learned

Lessons Learned865


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

Faroe
294 – Faroe

Transocean Arctic Drilling Operational 31/7-3 A
Brasse
Reservoir section 03/10/2019 After engaging fish in overshot an electrical release of cable head (ECRD) was planned. Due to . . .


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Faroe
295 – Faroe

Transocean Arctic Drilling Operational 31/7-3 A
Brasse
Reservoir section 03/10/2019 Unable to release cable head after engaging fish -> reverse cut and thread operation next. . . .


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Faroe
289 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Top hole 02/10/2019 Seabed visibility poor and current high when cementing 30″ conductor. Inclination on bullseyes . . .


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Faroe
290 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Intermediate section 02/10/2019 Pumped 3 x 20 m3 pills at section TD vs 2 x 20 m3 pills programmed. Not sure if made a difference, . . .


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Faroe
280 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 Weatherford Whirl Tool, part of Wellbore Cleanout Tools used for brushing riser and jetting BOP. OD . . .


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Faroe
281 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 Bent two singles 5 1/2″ HWDP while tagging top of surfacec cement plug after pulling BOP.


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Faroe
284 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 The 18 3/4″ HP housing lock ring released after cutting the 20″ casing with 20 mt overpull. . . .


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Faroe
274 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 30/09/2019 Tagged fill 30 m above casing hanger landing depth/ casing shoe 36 m off bottom. Washed heavy casing . . .


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Faroe
275 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 30/09/2019 Unable to set 9 5/8″ seal assembly. Observed initial pressure increase but unable to pass 100-120 . . .


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Faroe
276 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 30/09/2019 The overpull margin was down to only 26 mt at the end, while running the heavy and long 9 5/8″ . . .


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Wellesley
208 – Wellesley

Transocean Arctic Drilling Operational 35/12-6 S
Kallåsen
Production section 07/02/2019 The Halliburton BSS “skip & ship” system worked very well. There was no problem handling60 m/hr . . .


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Wellesley
209 – Wellesley

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


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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
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
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
180 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 Took time POOH from TD. Pulled straight to 15 MT overpull, worked same. Thereafter lubricated with . . .


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Wellesley
181 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 The 13 3/8″ casing was run to 2 m above the land off depth for 18 3/4″ WH. Circulated 1.5 x BU with . . .


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Wellesley
182 – Wellesley

Transocean Arctic Drilling Operational 35/12-7
Serin
Surface section 05/02/2019 When pumping drillwater out of the cement unit displacement tank, the pump sucked air, and delivered . . .


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