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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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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DNO
324 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Reservoir section 07/01/2019 …., F/C at shoe, 400 liter gain in trip tank. Closed in well, checked for PBU (none), RIH to TD, . . .


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DNO
327 – DNO

Island Innovator Drilling Operational 6507/7-16 S
Canela
Reservoir section 07/01/2019 ESD accidentally operated in wireline unit.


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Faroe
277 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Reservoir section 01/01/2019 Made first connection on core BHA #3. This 64 m core BHA would require 2 connections on bottom. . . .


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Faroe
278 – Faroe

Transocean Arctic Drilling Operational 30/6-30
Rungne
Reservoir section 01/01/2019 During POOH with coring assembly #3, took 70 mt overpull at 3250 m. After pulling further 9 m, got a . . .


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Faroe
162 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Reservoir section 28/09/2017
WL logs showed that the core point was in the Hardråde fm in the Shetland Gp and not in the Draupne . . .


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Faroe
163 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Reservoir section 28/09/2017 Stick clay was observed in the lower Fensfjord fm. Up to 22mt overpull was observed POOH, and a . . .


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Faroe
164 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Reservoir section 28/09/2017 Core jammed off after cutting 57m, not long after making a connection. Coring was started in the . . .


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Faroe
165 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal
Reservoir section 28/09/2017 Logged liner cement with USIT/CBL. Initial evaluation results offshore showed bad/no cement present. . . .


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Faroe
174 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal
Reservoir section 28/09/2017 When logging the 9 5/8” casing cement it was discovered during a repeat pass that the cement logs . . .


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DNO
1215 – DNO

Borgland Dolphin Drilling
Experience Transfer Meeting
Operational A-1 H, A-2 H, A-3 HT2
Oselvar
Reservoir section 10/03/2012 DONG handover documentation: All joints for the 13 3/8″ casing came out with DL connections . . .

Karina Helle / Morten Laget


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