WE Report

Lessons Learned

Lessons Learned865

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

Faroe
270 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 Intermediate section 27/09/2019 Difficult to achieve data acqusition requirement of 10 m samples.


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Faroe
271 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 Intermediate section 27/09/2019 Observed stick-slip while drilling through sand intervals and after a limestone stringer.


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Faroe
272 – Faroe

 		Transocean Arctic Drilling Operational 30/6-30
Rungne		 Intermediate section 27/09/2019 Axebalde bit with v-shaped cutters drilled through most limestone stringers without any reduction in . . .


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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
157 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 P&A 28/09/2017 Drilled 36″ hole with 36″ bit at 21 m/hr on bottom ROP without problems maintaining verticality.


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Faroe
158 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Top hole 28/09/2017 Problems to close the 30″ side door elevator due to shackles. Removed shackles and connected the 500 . . .


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Faroe
159 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Surface section 28/09/2017 Painted lengths on 13 3/8″ casing from town was actual lengths, not M/U lengths. This might cause . . .


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Faroe
160 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Surface section 28/09/2017 During M/U 18 3/4″ WHH, threads got cross threaded from side to side when moving the 18 3/4″ WHH. . . .


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Faroe
161 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 Intermediate section 28/09/2017 Remote on Cement head did not work. Had to operate manually by man in riding belt. The tool worked . . .


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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
166 – Faroe

 		Deepsea Bergen Well test Operational 31/7-2 S
Brasse Appraisal		 N/A 28/09/2017 Running cable through cut out in master bushing


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Faroe
167 – Faroe

 		Deepsea Bergen Well test Operational 31/7-2 S
Brasse Appraisal		 N/A 28/09/2017 N/A


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Faroe
168 – Faroe

 		Deepsea Bergen Well test Operational 31/7-2 S
Brasse Appraisal		 N/A 28/09/2017 Changing out subsea test tree, from 10 to 15 k


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Faroe
169 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 S
Brasse Appraisal		 P&A 28/09/2017 In DOP for pulling 9 5/8″ seal assembly, it was planned “Pick up with 3 ton overpull to check MPT . . .


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Faroe
170 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017 During displacement from WBM to OBM (while drilling out cement), attempted to u-tube kill and choke . . .


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Faroe
171 – Faroe

 		Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal		 Intermediate section 28/09/2017 Skips were not practical and required a lot of manual handling to operate. The lids are heavy and . . .


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