WE Report

Lessons Learned

Lessons Learned865


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

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
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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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
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
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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Faroe
172 – Faroe

Deepsea Bergen Drilling Operational 31/7-2 A
Brasse Appraisal
Intermediate section 28/09/2017
After making up the 9 5/8″ liner hanger circulation was attempted established with 2000 lpm. Losses . . .


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