WE Report

Lessons Learned

Lessons Learned865


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

Faroe
291 – Faroe

Transocean Arctic Drilling Operational 31/7-3 A
Brasse
Reservoir section 03/10/2019 It took 5 hours to drill the wiper plugs in the Weatherford liner. This is twice as long as normal. . . .


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Faroe
292 – Faroe

Transocean Arctic Drilling Operational 31/7-3 A
Brasse
Reservoir section 03/10/2019 Stuck with wireline toolstring 1A ZAIT-PEX-PPC-MSIP-PPC-NGI-XPT at 2831 m, bottom of toolstring and . . .


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Faroe
293 – Faroe

Transocean Arctic Drilling Operational 31/7-3 A
Brasse
Reservoir section 03/10/2019 Performed cut and thread operation to free stuck wireline cable and fish wireline toolstring 1A. . . .


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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
286 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Top hole 02/10/2019 Drilling 36″ was a challenge – boulders from just below seabed(148 m) to 181 m. Repeated reaming . . .


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Faroe
287 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Top hole 02/10/2019 Had to lay out one joint of fibreglass innerstring due to not able to M/U connection. No visible . . .


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Faroe
288 – Faroe

Transocean Arctic Drilling Operational 31/7-3 S
Brasse
Top hole 02/10/2019 Had relatively short rig move where operations ended with OBM and next well started with WBM. . . .


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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
279 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 Had to remove top stabbing guide on IRN to be able to M/U MPT (45 cm handling pup below). Reason for . . .


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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
282 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 Thread on tension mandrel was damaged in town (used for connecting Weatherford MOST tool to rotary . . .


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Faroe
283 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
P&A 01/10/2019 Used smaller “Sea Owl” for subsea observation while cutting surface casing strings. This allowed . . .


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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
273 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Intermediate section 30/09/2019 The 5 1/2″ DP handling pup made up to the 9 5/8″ casing hanger running tool was too short. The . . .


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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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